| [66] | 1 | <html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference - The Context Container</title><meta value="Craig R. McClanahan" name="author"><meta value="craigmcc@apache.org" name="email"></head><body vlink="#525D76" alink="#525D76" link="#525D76" text="#000000" bgcolor="#ffffff"><table cellspacing="0" width="100%" border="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img border="0" alt=" |
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| 2 | The Apache Tomcat Servlet/JSP Container |
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| 3 | " align="right" src="../images/tomcat.gif"></a></td><td><font face="arial,helvetica,sanserif"><h1>Apache Tomcat 6.0</h1></font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img border="0" alt="Apache Logo" align="right" src="../images/asf-logo.gif"></a></td></tr></table><table cellspacing="4" width="100%" border="0"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><tr><!--LEFT SIDE NAVIGATION--><td nowrap="true" valign="top" width="20%"><p><strong>Links</strong></p><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Config Ref. Home</a></li></ul><p><strong>Top Level Elements</strong></p><ul><li><a href="server.html">Server</a></li><li><a href="service.html">Service</a></li></ul><p><strong>Executors</strong></p><ul><li><a href="executor.html">Executor</a></li></ul><p><strong>Connectors</strong></p><ul><li><a href="http.html">HTTP</a></li><li><a href="ajp.html">AJP</a></li></ul><p><strong>Containers</strong></p><ul><li><a href="context.html">Context</a></li><li><a href="engine.html">Engine</a></li><li><a href="host.html">Host</a></li><li><a href="cluster.html">Cluster</a></li></ul><p><strong>Nested Components</strong></p><ul><li><a href="globalresources.html">Global Resources</a></li><li><a href="loader.html">Loader</a></li><li><a href="manager.html">Manager</a></li><li><a href="realm.html">Realm</a></li><li><a href="resources.html">Resources</a></li><li><a href="valve.html">Valve</a></li></ul><p><strong>Cluster Elements</strong></p><ul><li><a href="cluster.html">Cluster</a></li><li><a href="cluster-manager.html">Manager</a></li><li><a href="cluster-channel.html">Channel</a></li><li><a href="cluster-membership.html">Channel/Membership</a></li><li><a href="cluster-sender.html">Channel/Sender</a></li><li><a href="cluster-receiver.html">Channel/Receiver</a></li><li><a href="cluster-interceptor.html">Channel/Interceptor</a></li><li><a href="cluster-valve.html">Valve</a></li><li><a href="cluster-deployer.html">Deployer</a></li><li><a href="cluster-listener.html">ClusterListener</a></li></ul><p><strong>Global Settings</strong></p><ul><li><a href="systemprops.html">System properties</a></li></ul></td><!--RIGHT SIDE MAIN BODY--><td align="left" valign="top" width="80%"><table cellspacing="4" width="100%" border="0"><tr><td valign="top" align="left"><h1>Apache Tomcat Configuration Reference</h1><h2>The Context Container</h2></td><td nowrap="true" valign="top" align="right"><small><a href="printer/context.html"><img alt="Printer Friendly Version" border="0" src="../images/printer.gif"><br>print-friendly<br>version |
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| 4 | </a></small></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote> |
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| 5 | |
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| 6 | <blockquote><em> |
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| 7 | <p>The description below uses the variable name $CATALINA_BASE to refer the |
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| 8 | base directory against which most relative paths are resolved. If you have |
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| 9 | not configured Tomcat 6 for multiple instances by setting a CATALINA_BASE |
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| 10 | directory, then $CATALINA_BASE will be set to the value of $CATALINA_HOME, |
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| 11 | the directory into which you have installed Tomcat 6.</p> |
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| 12 | </em></blockquote> |
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| 13 | |
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| 14 | <p>The <strong>Context</strong> element represents a <em>web |
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| 15 | application</em>, which is run within a particular virtual host. |
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| 16 | Each web application is based on a <em>Web Application Archive</em> |
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| 17 | (WAR) file, or a corresponding directory containing the corresponding |
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| 18 | unpacked contents, as described in the Servlet Specification (version |
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| 19 | 2.2 or later). For more information about web application archives, |
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| 20 | you can download the |
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| 21 | <a href="http://java.sun.com/products/servlet/download.html">Servlet |
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| 22 | Specification</a>, and review the Tomcat |
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| 23 | <a href="../appdev/index.html">Application Developer's Guide</a>.</p> |
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| 24 | |
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| 25 | <p>The web application used to process each HTTP request is selected |
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| 26 | by Catalina based on matching the longest possible prefix of the |
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| 27 | Request URI against the <em>context path</em> of each defined Context. |
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| 28 | Once selected, that Context will select an appropriate servlet to |
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| 29 | process the incoming request, according to the servlet mappings defined |
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| 30 | in the <em>web application deployment descriptor</em> file (which MUST |
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| 31 | be located at <code>/WEB-INF/web.xml</code> within the web app's |
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| 32 | directory hierarchy).</p> |
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| 33 | |
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| 34 | <p>You may define as many <strong>Context</strong> elements as you |
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| 35 | wish. Each such Context MUST have a unique context path. In |
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| 36 | addition, a Context must be present with a context path equal to |
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| 37 | a zero-length string. This Context becomes the <em>default</em> |
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| 38 | web application for this virtual host, and is used to process all |
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| 39 | requests that do not match any other Context's context path.</p> |
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| 40 | |
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| 41 | <p><b>For Tomcat 6, unlike Tomcat 4.x, it is NOT recommended to place |
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| 42 | <Context> elements directly in the server.xml file.</b> This |
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| 43 | is because it makes modifing the <strong>Context</strong> configuration |
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| 44 | more invasive since the main <code>conf/server.xml</code> file cannot be |
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| 45 | reloaded without restarting Tomcat.</p> |
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| 46 | |
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| 47 | <p><strong>Context</strong> elements may be explicitly defined: |
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| 48 | <ul> |
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| 49 | <li>in the <code>$CATALINA_BASE/conf/context.xml</code> file: |
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| 50 | the Context element information will be loaded by all webapps</li> |
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| 51 | <li>in the |
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| 52 | <code>$CATALINA_BASE/conf/[enginename]/[hostname]/context.xml.default</code> |
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| 53 | file: the Context element information will be loaded by all webapps of that |
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| 54 | host</li> |
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| 55 | <li>in individual files (with a ".xml" extension) in the |
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| 56 | <code>$CATALINA_BASE/conf/[enginename]/[hostname]/</code> directory. |
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| 57 | The name of the file (less the .xml extension) will be used as the |
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| 58 | context path. Multi-level context paths may be defined using #, e.g. |
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| 59 | <code>context#path.xml</code>. The default web application may be defined |
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| 60 | by using a file called <code>ROOT.xml</code>.</li> |
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| 61 | <li>if the previous file was not found for this application, in an individual |
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| 62 | file at <code>/META-INF/context.xml</code> inside the application files</li> |
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| 63 | <li>inside a <a href="host.html">Host</a> element in the main |
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| 64 | <code>conf/server.xml</code></li> |
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| 65 | </ul> |
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| 66 | </p> |
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| 67 | |
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| 68 | <p>With the exception of server.xml, files that define <strong>Context |
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| 69 | </strong> elements may only define a single <strong>Context</strong> element. |
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| 70 | </p> |
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| 71 | |
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| 72 | <p>In addition to explicitly specified Context elements, there are |
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| 73 | several techniques by which Context elements can be created automatically |
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| 74 | for you. See <a href="host.html#Automatic Application Deployment"> |
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| 75 | Automatic Application Deployment</a> and |
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| 76 | <a href="host.html#User Web Applications">User Web Applications</a> |
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| 77 | for more information.</p> |
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| 78 | |
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| 79 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 80 | |
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| 81 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Common Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 82 | |
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| 83 | <p>All implementations of <strong>Context</strong> |
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| 84 | support the following attributes:</p> |
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| 85 | |
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| 86 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>backgroundProcessorDelay</code></td><td valign="center" align="left"> |
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| 87 | <p>This value represents the delay in seconds between the |
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| 88 | invocation of the backgroundProcess method on this context and |
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| 89 | its child containers, including all wrappers. |
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| 90 | Child containers will not be invoked if their delay value is not |
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| 91 | negative (which would mean they are using their own processing |
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| 92 | thread). Setting this to a positive value will cause |
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| 93 | a thread to be spawn. After waiting the specified amount of time, |
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| 94 | the thread will invoke the backgroundProcess method on this host |
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| 95 | and all its child containers. A context will use background |
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| 96 | processing to perform session expiration and class monitoring for |
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| 97 | reloading. If not specified, the default value for this attribute is |
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| 98 | -1, which means the context will rely on the background processing |
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| 99 | thread of its parent host.</p> |
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| 100 | </td></tr><tr><td valign="center" align="left"><code>className</code></td><td valign="center" align="left"> |
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| 101 | <p>Java class name of the implementation to use. This class must |
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| 102 | implement the <code>org.apache.catalina.Context</code> interface. |
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| 103 | If not specified, the standard value (defined below) will be used.</p> |
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| 104 | </td></tr><tr><td valign="center" align="left"><code>cookies</code></td><td valign="center" align="left"> |
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| 105 | <p>Set to <code>true</code> if you want cookies to be used for |
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| 106 | session identifier communication if supported by the client (this |
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| 107 | is the default). Set to <code>false</code> if you want to disable |
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| 108 | the use of cookies for session identifier communication, and rely |
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| 109 | only on URL rewriting by the application.</p> |
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| 110 | </td></tr><tr><td valign="center" align="left"><code>crossContext</code></td><td valign="center" align="left"> |
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| 111 | <p>Set to <code>true</code> if you want calls within this application |
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| 112 | to <code>ServletContext.getContext()</code> to successfully return a |
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| 113 | request dispatcher for other web applications running on this virtual |
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| 114 | host. Set to <code>false</code> (the default) in security |
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| 115 | conscious environments, to make <code>getContext()</code> always |
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| 116 | return <code>null</code>.</p> |
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| 117 | </td></tr><tr><td valign="center" align="left"><strong><code>docBase</code></strong></td><td valign="center" align="left"> |
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| 118 | <p>The <em>Document Base</em> (also known as the <em>Context |
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| 119 | Root</em>) directory for this web application, or the pathname |
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| 120 | to the web application archive file (if this web application is |
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| 121 | being executed directly from the WAR file). You may specify |
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| 122 | an absolute pathname for this directory or WAR file, or a pathname |
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| 123 | that is relative to the <code>appBase</code> directory of the |
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| 124 | owning <a href="host.html">Host</a>.</p> |
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| 125 | <p>The value of this field must not be set when the Context is |
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| 126 | configured using a <code>META-INF/context.xml</code> file as it will be |
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| 127 | inferred by the automatic deployment process.</p> |
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| 128 | </td></tr><tr><td valign="center" align="left"><code>override</code></td><td valign="center" align="left"> |
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| 129 | <p>Set to <code>true</code> to have explicit settings in this |
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| 130 | Context element override any corresponding settings in the |
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| 131 | <a href="defaultcontext.html">DefaultContext</a> element associated |
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| 132 | with our owning <a href="host.html">Host</a>. By default, settings |
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| 133 | in the DefaultContext element will be used.</p> |
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| 134 | <p>If a symbolic link is used for docBase then changes to the |
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| 135 | symbolic link will only be effective after a Tomcat restart or |
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| 136 | by undeploying and redeploying the conext. A context reload is not |
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| 137 | sufficient.</p> |
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| 138 | </td></tr><tr><td valign="center" align="left"><code>privileged</code></td><td valign="center" align="left"> |
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| 139 | <p>Set to <code>true</code> to allow this context to use container |
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| 140 | servlets, like the manager servlet. Use of the <code>privileged</code> |
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| 141 | attribute will change the context's parent class loader to be the |
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| 142 | <em>Server</em> class loader rather than the <em>Shared</em> class |
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| 143 | loader. Note that in a default installation, the <em>Common</em> class |
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| 144 | loader is used for both the <em>Server</em> and the <em>Shared</em> |
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| 145 | class loaders.</p> |
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| 146 | </td></tr><tr><td valign="center" align="left"><code>path</code></td><td valign="center" align="left"> |
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| 147 | <p>The <em>context path</em> of this web application, which is |
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| 148 | matched against the beginning of each request URI to select the |
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| 149 | appropriate web application for processing. All of the context paths |
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| 150 | within a particular <a href="host.html">Host</a> must be unique. |
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| 151 | If you specify a context path of an empty string (""), you are |
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| 152 | defining the <em>default</em> web application for this Host, which |
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| 153 | will process all requests not assigned to other Contexts.</p> |
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| 154 | <p>The value of this field must not be set except when statically |
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| 155 | defining a Context in server.xml, as it will be inferred from the |
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| 156 | filenames used for either the .xml context file or the docBase.</p> |
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| 157 | </td></tr><tr><td valign="center" align="left"><code>reloadable</code></td><td valign="center" align="left"> |
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| 158 | <p>Set to <code>true</code> if you want Catalina to monitor classes in |
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| 159 | <code>/WEB-INF/classes/</code> and <code>/WEB-INF/lib</code> for |
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| 160 | changes, and automatically reload the web application if a change |
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| 161 | is detected. This feature is very useful during application |
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| 162 | development, but it requires significant runtime overhead and is |
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| 163 | not recommended for use on deployed production applications. That's |
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| 164 | why the default setting for this attribute is <i>false</i>. You |
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| 165 | can use the <a href="../manager-howto.html">Manager</a> web |
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| 166 | application, however, to trigger reloads of deployed applications |
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| 167 | on demand.</p> |
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| 168 | </td></tr><tr><td valign="center" align="left"><code>wrapperClass</code></td><td valign="center" align="left"> |
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| 169 | <p>Java class name of the <code>org.apache.catalina.Wrapper</code> |
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| 170 | implementation class that will be used for servlets managed by this |
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| 171 | Context. If not specified, a standard default value will be used.</p> |
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| 172 | </td></tr></table> |
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| 173 | |
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| 174 | </blockquote></td></tr></table> |
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| 175 | |
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| 176 | |
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| 177 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Standard Implementation"><strong>Standard Implementation</strong></a></font></td></tr><tr><td><blockquote> |
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| 178 | |
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| 179 | <p>The standard implementation of <strong>Context</strong> is |
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| 180 | <strong>org.apache.catalina.core.StandardContext</strong>. |
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| 181 | It supports the following additional attributes (in addition to the |
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| 182 | common attributes listed above):</p> |
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| 183 | |
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| 184 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>allowLinking</code></td><td valign="center" align="left"> |
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| 185 | <p>If the value of this flag is <code>true</code>, symlinks will be |
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| 186 | allowed inside the web application, pointing to resources outside the |
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| 187 | web application base path. If not specified, the default value |
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| 188 | of the flag is <code>false</code>.</p> |
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| 189 | <p><b>NOTE: This flag MUST NOT be set to true on the Windows platform |
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| 190 | (or any other OS which does not have a case sensitive filesystem), |
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| 191 | as it will disable case sensitivity checks, allowing JSP source code |
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| 192 | disclosure, among other security problems.</b></p> |
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| 193 | </td></tr><tr><td valign="center" align="left"><code>antiJARLocking</code></td><td valign="center" align="left"> |
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| 194 | <p>If true, the Tomcat classloader will take extra measures to avoid |
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| 195 | JAR file locking when resources are accessed inside JARs through URLs. |
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| 196 | This will impact startup time of applications, but could prove to be useful |
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| 197 | on platforms or configurations where file locking can occur. |
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| 198 | If not specified, the default value is <code>false</code>.</p> |
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| 199 | </td></tr><tr><td valign="center" align="left"><code>antiResourceLocking</code></td><td valign="center" align="left"> |
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| 200 | <p>If true, Tomcat will prevent any file locking. |
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| 201 | This will significantly impact startup time of applications, |
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| 202 | but allows full webapp hot deploy and undeploy on platforms |
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| 203 | or configurations where file locking can occur. |
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| 204 | If not specified, the default value is <code>false</code>.</p> |
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| 205 | |
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| 206 | <p>Please note that setting this to <code>true</code> has some side effects, |
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| 207 | including the disabling of JSP reloading in a running server: see |
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| 208 | <a href="http://issues.apache.org/bugzilla/show_bug.cgi?id=37668">Bugzilla 37668</a>. |
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| 209 | </p> |
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| 210 | |
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| 211 | <p> |
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| 212 | Please note that setting this flag to true in applications that are |
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| 213 | outside the appBase for the Host (the <code>webapps</code> directory |
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| 214 | by default) will cause the application to be |
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| 215 | <strong>deleted</strong> on Tomcat shutdown. You probably don't want to |
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| 216 | do this, so think twice before setting antiResourceLocking=true on a webapp |
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| 217 | that's outside the appBase for its Host. |
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| 218 | </p> |
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| 219 | </td></tr><tr><td valign="center" align="left"><code>cacheMaxSize</code></td><td valign="center" align="left"> |
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| 220 | <p>Maximum size of the static resource cache in kilobytes. |
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| 221 | If not specified, the default value is <code>10240</code> |
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| 222 | (10 megabytes).</p> |
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| 223 | </td></tr><tr><td valign="center" align="left"><code>cacheTTL</code></td><td valign="center" align="left"> |
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| 224 | <p>Amount of time in milliseconds between cache entries revalidation. |
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| 225 | If not specified, the default value is <code>5000</code> |
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| 226 | (5 seconds).</p> |
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| 227 | </td></tr><tr><td valign="center" align="left"><code>cachingAllowed</code></td><td valign="center" align="left"> |
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| 228 | <p>If the value of this flag is <code>true</code>, the cache for static |
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| 229 | resources will be used. If not specified, the default value |
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| 230 | of the flag is <code>true</code>.</p> |
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| 231 | </td></tr><tr><td valign="center" align="left"><code>caseSensitive</code></td><td valign="center" align="left"> |
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| 232 | <p>If the value of this flag is <code>true</code>, all case sensitivity |
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| 233 | checks will be disabled. If not |
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| 234 | specified, the default value of the flag is <code>true</code>.</p> |
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| 235 | <p><b>NOTE: This flag MUST NOT be set to false on the Windows platform |
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| 236 | (or any other OS which does not have a case sensitive filesystem), |
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| 237 | as it will disable case sensitivity checks, allowing JSP source code |
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| 238 | disclosure, among other security problems.</b></p> |
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| 239 | </td></tr><tr><td valign="center" align="left"><code>processTlds</code></td><td valign="center" align="left"> |
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| 240 | <p>Whether the context should process TLDs on startup. The default |
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| 241 | is true. The false setting is intended for special cases |
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| 242 | that know in advance TLDs are not part of the webapp.</p> |
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| 243 | </td></tr><tr><td valign="center" align="left"><code>swallowOutput</code></td><td valign="center" align="left"> |
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| 244 | <p>If the value of this flag is <code>true</code>, the bytes output to |
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| 245 | System.out and System.err by the web application will be redirected to |
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| 246 | the web application logger. If not specified, the default value |
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| 247 | of the flag is <code>false</code>.</p> |
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| 248 | </td></tr><tr><td valign="center" align="left"><code>tldNamespaceAware</code></td><td valign="center" align="left"> |
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| 249 | <p>If the value of this flag is <code>true</code>, the TLD files |
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| 250 | XML validation will be namespace-aware. If you turn this flag on, |
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| 251 | you should probably also turn <code>tldValidation</code> on. The |
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| 252 | default value for this flag is <code>false</code>, and setting it |
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| 253 | to true will incur a performance penalty. |
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| 254 | </p> |
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| 255 | </td></tr><tr><td valign="center" align="left"><code>tldValidation</code></td><td valign="center" align="left"> |
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| 256 | <p>If the value of this flag is <code>true</code>, the TLD files |
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| 257 | will be XML validated on context startup. The default value for |
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| 258 | this flag is <code>false</code>, and setting it to true will incur |
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| 259 | a performance penalty.</p> |
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| 260 | </td></tr><tr><td valign="center" align="left"><code>unloadDelay</code></td><td valign="center" align="left"> |
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| 261 | <p>Amount of ms that the container will wait for servlets to unload. |
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| 262 | If not specified, the default value of the flag is <code>2000</code> |
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| 263 | ms.</p> |
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| 264 | </td></tr><tr><td valign="center" align="left"><code>unpackWAR</code></td><td valign="center" align="left"> |
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| 265 | <p>If true, Tomcat will unpack all compressed web applications before |
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| 266 | running them. |
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| 267 | If not specified, the default value is <code>true</code>.</p> |
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| 268 | </td></tr><tr><td valign="center" align="left"><code>useNaming</code></td><td valign="center" align="left"> |
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| 269 | <p>Set to <code>true</code> (the default) to have Catalina enable a |
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| 270 | JNDI <code>InitialContext</code> for this web application that is |
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| 271 | compatible with Java2 Enterprise Edition (J2EE) platform |
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| 272 | conventions.</p> |
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| 273 | </td></tr><tr><td valign="center" align="left"><code>workDir</code></td><td valign="center" align="left"> |
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| 274 | <p>Pathname to a scratch directory to be provided by this Context |
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| 275 | for temporary read-write use by servlets within the associated web |
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| 276 | application. This directory will be made visible to servlets in the |
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| 277 | web application by a servlet context attribute (of type |
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| 278 | <code>java.io.File</code>) named |
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| 279 | <code>javax.servlet.context.tempdir</code> as described in the |
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| 280 | Servlet Specification. If not specified, a suitable directory |
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| 281 | underneath <code>$CATALINA_BASE/work</code> will be provided.</p> |
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| 282 | </td></tr></table> |
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| 283 | |
|---|
| 284 | </blockquote></td></tr></table> |
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| 285 | |
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| 286 | |
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| 287 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Nested Components"><strong>Nested Components</strong></a></font></td></tr><tr><td><blockquote> |
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| 288 | |
|---|
| 289 | <p>You can nest at most one instance of the following utility components |
|---|
| 290 | by nesting a corresponding element inside your <strong>Context</strong> |
|---|
| 291 | element:</p> |
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| 292 | <ul> |
|---|
| 293 | <li><a href="loader.html"><strong>Loader</strong></a> - |
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| 294 | Configure the web application class loader that will be used to load |
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| 295 | servlet and bean classes for this web application. Normally, the |
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| 296 | default configuration of the class loader will be sufficient.</li> |
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| 297 | <li><a href="manager.html"><strong>Manager</strong></a> - |
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| 298 | Configure the session manager that will be used to create, destroy, |
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| 299 | and persist HTTP sessions for this web application. Normally, the |
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| 300 | default configuration of the session manager will be sufficient.</li> |
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| 301 | <li><a href="realm.html"><strong>Realm</strong></a> - |
|---|
| 302 | Configure a realm that will allow its |
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| 303 | database of users, and their associated roles, to be utilized solely |
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| 304 | for this particular web application. If not specified, this web |
|---|
| 305 | application will utilize the Realm associated with the owning |
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| 306 | <a href="host.html">Host</a> or <a href="engine.html">Engine</a>.</li> |
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| 307 | <li><a href="resources.html"><strong>Resources</strong></a> - |
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| 308 | Configure the resource manager that will be used to access the static |
|---|
| 309 | resources associated with this web application. Normally, the |
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| 310 | default configuration of the resource manager will be sufficient.</li> |
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| 311 | <li><strong>WatchedResource</strong> - The auto deployer will monitor the |
|---|
| 312 | specified static resource of the web application for updates, and will |
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| 313 | reload the web application if is is updated. The content of this element |
|---|
| 314 | must be a string.</li> |
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| 315 | </ul> |
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| 316 | |
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| 317 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Special Features"><strong>Special Features</strong></a></font></td></tr><tr><td><blockquote> |
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| 318 | |
|---|
| 319 | |
|---|
| 320 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Logging"><strong>Logging</strong></a></font></td></tr><tr><td><blockquote> |
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| 321 | |
|---|
| 322 | <p>A context is associated with the |
|---|
| 323 | <code>org.apache.catalina.core.ContainerBase.[enginename].[hostname].[path]</code> |
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| 324 | log category. Note that the brackets are actually part of the name, don't omit them.</p> |
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| 325 | |
|---|
| 326 | </blockquote></td></tr></table> |
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| 327 | |
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| 328 | |
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| 329 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Access Logs"><strong>Access Logs</strong></a></font></td></tr><tr><td><blockquote> |
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| 330 | |
|---|
| 331 | <p>When you run a web server, one of the output files normally generated |
|---|
| 332 | is an <em>access log</em>, which generates one line of information for |
|---|
| 333 | each request processed by the server, in a standard format. Catalina |
|---|
| 334 | includes an optional <a href="valve.html">Valve</a> implementation that |
|---|
| 335 | can create access logs in the same standard format created by web servers, |
|---|
| 336 | or in any number of custom formats.</p> |
|---|
| 337 | |
|---|
| 338 | <p>You can ask Catalina to create an access log for all requests |
|---|
| 339 | processed by an <a href="engine.html">Engine</a>, |
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| 340 | <a href="host.html">Host</a>, or <a href="context.html">Context</a> |
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| 341 | by nesting a <a href="valve.html">Valve</a> element like this:</p> |
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| 342 | |
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| 343 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
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| 344 | <Context path="/examples" ...> |
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| 345 | ... |
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| 346 | <Valve className="org.apache.catalina.valves.AccessLogValve" |
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| 347 | prefix="localhost_access_log." suffix=".txt" |
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| 348 | pattern="common"/> |
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| 349 | ... |
|---|
| 350 | </Context> |
|---|
| 351 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr></table></div> |
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| 352 | |
|---|
| 353 | <p>See <a href="valve.html#Access Log Valve">Access Log Valve</a> |
|---|
| 354 | for more information on the configuration attributes that are |
|---|
| 355 | supported.</p> |
|---|
| 356 | |
|---|
| 357 | </blockquote></td></tr></table> |
|---|
| 358 | |
|---|
| 359 | |
|---|
| 360 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Automatic Context Configuration"><strong>Automatic Context Configuration</strong></a></font></td></tr><tr><td><blockquote> |
|---|
| 361 | |
|---|
| 362 | <p>If you use the standard <strong>Context</strong> implementation, |
|---|
| 363 | the following configuration steps occur automtically when Catalina |
|---|
| 364 | is started, or whenever this web application is reloaded. No special |
|---|
| 365 | configuration is required to enable this feature.</p> |
|---|
| 366 | |
|---|
| 367 | <ul> |
|---|
| 368 | <li>If you have not declared your own <a href="loader.html">Loader</a> |
|---|
| 369 | element, a standard web application class loader will be configured. |
|---|
| 370 | </li> |
|---|
| 371 | <li>If you have not declared your own <a href="manager.html">Manager</a> |
|---|
| 372 | element, a standard session manager will be configured.</li> |
|---|
| 373 | <li>If you have not declared your own <a href="resources.html">Resources</a> |
|---|
| 374 | element, a standard resources manager will be configured.</li> |
|---|
| 375 | <li>The web application properties listed in <code>conf/web.xml</code> |
|---|
| 376 | will be processed as defaults for this web application. This is used |
|---|
| 377 | to establish default mappings (such as mapping the <code>*.jsp</code> |
|---|
| 378 | extension to the corresponding JSP servlet), and other standard |
|---|
| 379 | features that apply to all web applications.</li> |
|---|
| 380 | <li>The web application properties listed in the |
|---|
| 381 | <code>/WEB-INF/web.xml</code> resource for this web application |
|---|
| 382 | will be processed (if this resource exists).</li> |
|---|
| 383 | <li>If your web application has specified security constraints that might |
|---|
| 384 | require user authentication, an appropriate Authenticator that |
|---|
| 385 | implements the login method you have selected will be configured.</li> |
|---|
| 386 | </ul> |
|---|
| 387 | |
|---|
| 388 | </blockquote></td></tr></table> |
|---|
| 389 | |
|---|
| 390 | |
|---|
| 391 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Context Parameters"><strong>Context Parameters</strong></a></font></td></tr><tr><td><blockquote> |
|---|
| 392 | |
|---|
| 393 | <p>You can configure named values that will be made visible to the |
|---|
| 394 | web application as servlet context initialization parameters by nesting |
|---|
| 395 | <code><Parameter></code> elements inside this element. For |
|---|
| 396 | example, you can create an initialization parameter like this:</p> |
|---|
| 397 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
|---|
| 398 | <Context ...> |
|---|
| 399 | ... |
|---|
| 400 | <Parameter name="companyName" value="My Company, Incorporated" |
|---|
| 401 | override="false"/> |
|---|
| 402 | ... |
|---|
| 403 | </Context> |
|---|
| 404 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr></table></div> |
|---|
| 405 | |
|---|
| 406 | <p>This is equivalent to the inclusion of the following element in the |
|---|
| 407 | web application deployment descriptor (<code>/WEB-INF/web.xml</code>): |
|---|
| 408 | </p> |
|---|
| 409 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
|---|
| 410 | <context-param> |
|---|
| 411 | <param-name>companyName</param-name> |
|---|
| 412 | <param-value>My Company, Incorporated</param-value> |
|---|
| 413 | </context-param> |
|---|
| 414 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr></table></div> |
|---|
| 415 | <p>but does <em>not</em> require modification of the deployment descriptor |
|---|
| 416 | to customize this value.</p> |
|---|
| 417 | |
|---|
| 418 | <p>The valid attributes for a <code><Parameter></code> element |
|---|
| 419 | are as follows:</p> |
|---|
| 420 | |
|---|
| 421 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>description</code></td><td valign="center" align="left"> |
|---|
| 422 | <p>Optional, human-readable description of this context |
|---|
| 423 | initialization parameter.</p> |
|---|
| 424 | </td></tr><tr><td valign="center" align="left"><strong><code>name</code></strong></td><td valign="center" align="left"> |
|---|
| 425 | <p>The name of the context initialization parameter to be created.</p> |
|---|
| 426 | </td></tr><tr><td valign="center" align="left"><code>override</code></td><td valign="center" align="left"> |
|---|
| 427 | <p>Set this to <code>false</code> if you do <strong>not</strong> want |
|---|
| 428 | a <code><context-param></code> for the same parameter name, |
|---|
| 429 | found in the web application deployment descriptor, to override the |
|---|
| 430 | value specified here. By default, overrides are allowed.</p> |
|---|
| 431 | </td></tr><tr><td valign="center" align="left"><strong><code>value</code></strong></td><td valign="center" align="left"> |
|---|
| 432 | <p>The parameter value that will be presented to the application |
|---|
| 433 | when requested by calling |
|---|
| 434 | <code>ServletContext.getInitParameter()</code>.</p> |
|---|
| 435 | </td></tr></table> |
|---|
| 436 | |
|---|
| 437 | </blockquote></td></tr></table> |
|---|
| 438 | |
|---|
| 439 | |
|---|
| 440 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Environment Entries"><strong>Environment Entries</strong></a></font></td></tr><tr><td><blockquote> |
|---|
| 441 | |
|---|
| 442 | <p>You can configure named values that will be made visible to the |
|---|
| 443 | web application as environment entry resources, by nesting |
|---|
| 444 | <code><Environment></code> entries inside this element. For |
|---|
| 445 | example, you can create an environment entry like this:</p> |
|---|
| 446 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
|---|
| 447 | <Context ...> |
|---|
| 448 | ... |
|---|
| 449 | <Environment name="maxExemptions" value="10" |
|---|
| 450 | type="java.lang.Integer" override="false"/> |
|---|
| 451 | ... |
|---|
| 452 | </Context> |
|---|
| 453 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr></table></div> |
|---|
| 454 | |
|---|
| 455 | <p>This is equivalent to the inclusion of the following element in the |
|---|
| 456 | web application deployment descriptor (<code>/WEB-INF/web.xml</code>): |
|---|
| 457 | </p> |
|---|
| 458 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
|---|
| 459 | <env-entry> |
|---|
| 460 | <env-entry-name>maxExemptions</param-name> |
|---|
| 461 | <env-entry-value>10</env-entry-value> |
|---|
| 462 | <env-entry-type>java.lang.Integer</env-entry-type> |
|---|
| 463 | </env-entry> |
|---|
| 464 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr></table></div> |
|---|
| 465 | <p>but does <em>not</em> require modification of the deployment descriptor |
|---|
| 466 | to customize this value.</p> |
|---|
| 467 | |
|---|
| 468 | <p>The valid attributes for an <code><Environment></code> element |
|---|
| 469 | are as follows:</p> |
|---|
| 470 | |
|---|
| 471 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>description</code></td><td valign="center" align="left"> |
|---|
| 472 | <p>Optional, human-readable description of this environment entry.</p> |
|---|
| 473 | </td></tr><tr><td valign="center" align="left"><strong><code>name</code></strong></td><td valign="center" align="left"> |
|---|
| 474 | <p>The name of the environment entry to be created, relative to the |
|---|
| 475 | <code>java:comp/env</code> context.</p> |
|---|
| 476 | </td></tr><tr><td valign="center" align="left"><code>override</code></td><td valign="center" align="left"> |
|---|
| 477 | <p>Set this to <code>false</code> if you do <strong>not</strong> want |
|---|
| 478 | an <code><env-entry></code> for the same environment entry name, |
|---|
| 479 | found in the web application deployment descriptor, to override the |
|---|
| 480 | value specified here. By default, overrides are allowed.</p> |
|---|
| 481 | </td></tr><tr><td valign="center" align="left"><strong><code>type</code></strong></td><td valign="center" align="left"> |
|---|
| 482 | <p>The fully qualified Java class name expected by the web application |
|---|
| 483 | for this environment entry. Must be one of the legal values for |
|---|
| 484 | <code><env-entry-type></code> in the web application deployment |
|---|
| 485 | descriptor: <code>java.lang.Boolean</code>, |
|---|
| 486 | <code>java.lang.Byte</code>, <code>java.lang.Character</code>, |
|---|
| 487 | <code>java.lang.Double</code>, <code>java.lang.Float</code>, |
|---|
| 488 | <code>java.lang.Integer</code>, <code>java.lang.Long</code>, |
|---|
| 489 | <code>java.lang.Short</code>, or <code>java.lang.String</code>.</p> |
|---|
| 490 | </td></tr><tr><td valign="center" align="left"><strong><code>value</code></strong></td><td valign="center" align="left"> |
|---|
| 491 | <p>The parameter value that will be presented to the application |
|---|
| 492 | when requested from the JNDI context. This value must be convertable |
|---|
| 493 | to the Java type defined by the <code>type</code> attribute.</p> |
|---|
| 494 | </td></tr></table> |
|---|
| 495 | |
|---|
| 496 | </blockquote></td></tr></table> |
|---|
| 497 | |
|---|
| 498 | |
|---|
| 499 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Lifecycle Listeners"><strong>Lifecycle Listeners</strong></a></font></td></tr><tr><td><blockquote> |
|---|
| 500 | |
|---|
| 501 | <p>If you have implemented a Java object that needs to know when this |
|---|
| 502 | <strong>Context</strong> is started or stopped, you can declare it by |
|---|
| 503 | nesting a <strong>Listener</strong> element inside this element. The |
|---|
| 504 | class name you specify must implement the |
|---|
| 505 | <code>org.apache.catalina.LifecycleListener</code> interface, and |
|---|
| 506 | the class must be packaged in a jar and placed in the |
|---|
| 507 | <code>$CATALINA_HOME/lib</code> directory. |
|---|
| 508 | It will be notified about the occurrence of the corresponding |
|---|
| 509 | lifecycle events. Configuration of such a listener looks like this:</p> |
|---|
| 510 | |
|---|
| 511 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
|---|
| 512 | <Context path="/examples" ...> |
|---|
| 513 | ... |
|---|
| 514 | <Listener className="com.mycompany.mypackage.MyListener" ... > |
|---|
| 515 | ... |
|---|
| 516 | </Context> |
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| 517 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr></table></div> |
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| 518 | |
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| 519 | <p>Note that a Listener can have any number of additional properties |
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| 520 | that may be configured from this element. Attribute names are matched |
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| 521 | to corresponding JavaBean property names using the standard property |
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| 522 | method naming patterns.</p> |
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| 523 | |
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| 524 | </blockquote></td></tr></table> |
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| 525 | |
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| 526 | |
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| 527 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Request Filters"><strong>Request Filters</strong></a></font></td></tr><tr><td><blockquote> |
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| 528 | |
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| 529 | <p>You can ask Catalina to check the IP address, or host name, on every |
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| 530 | incoming request directed to the surrounding |
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| 531 | <a href="engine.html">Engine</a>, <a href="host.html">Host</a>, or |
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| 532 | <a href="context.html">Context</a> element. The remote address or name |
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| 533 | will be checked against a configured list of "accept" and/or "deny" |
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| 534 | filters, which are defined using the Regular Expression syntax supported |
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| 535 | by the <a href="http://jakarta.apache.org/regexp/">Jakarta Regexp</a> |
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| 536 | regular expression library. Requests that come from locations that are |
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| 537 | not accepted will be rejected with an HTTP "Forbidden" error. |
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| 538 | Example filter declarations:</p> |
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| 539 | |
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| 540 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
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| 541 | <Context path="/examples" ...> |
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| 542 | ... |
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| 543 | <Valve className="org.apache.catalina.valves.RemoteHostValve" |
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| 544 | allow="*.mycompany.com,www.yourcompany.com"/> |
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| 545 | <Valve className="org.apache.catalina.valves.RemoteAddrValve" |
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| 546 | deny="192.168.1.*"/> |
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| 547 | ... |
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| 548 | </Context> |
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| 549 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr></table></div> |
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| 550 | |
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| 551 | <p>See <a href="valve.html#Remote Address Filter">Remote Address Filter</a> |
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| 552 | and <a href="valve.html#Remote Host Filter">Remote Host Filter</a> for |
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| 553 | more information about the configuration options that are supported.</p> |
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| 554 | |
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| 555 | </blockquote></td></tr></table> |
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| 556 | |
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| 557 | |
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| 558 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Resource Definitions"><strong>Resource Definitions</strong></a></font></td></tr><tr><td><blockquote> |
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| 559 | |
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| 560 | <p>You can declare the characteristics of the resource |
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| 561 | to be returned for JNDI lookups of <code><resource-ref></code> and |
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| 562 | <code><resource-env-ref></code> elements in the web application |
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| 563 | deployment descriptor. You <strong>MUST</strong> also define |
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| 564 | the needed resource parameters as attributes of the <code>Resource</code> |
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| 565 | element, to configure the object factory to be used (if not known to Tomcat |
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| 566 | already), and the properties used to configure that object factory.</p> |
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| 567 | |
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| 568 | <p>For example, you can create a resource definition like this:</p> |
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| 569 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
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| 570 | <Context ...> |
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| 571 | ... |
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| 572 | <Resource name="jdbc/EmployeeDB" auth="Container" |
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| 573 | type="javax.sql.DataSource" |
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| 574 | description="Employees Database for HR Applications"/> |
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| 575 | ... |
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| 576 | </Context> |
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| 577 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr></table></div> |
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| 578 | |
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| 579 | <p>This is equivalent to the inclusion of the following element in the |
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| 580 | web application deployment descriptor (<code>/WEB-INF/web.xml</code>):</p> |
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| 581 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
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| 582 | <resource-ref> |
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| 583 | <description>Employees Database for HR Applications</description> |
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| 584 | <res-ref-name>jdbc/EmployeeDB</res-ref-name> |
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| 585 | <res-ref-type>javax.sql.DataSource</res-ref-type> |
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| 586 | <res-auth>Container</res-auth> |
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| 587 | </resource-ref> |
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| 588 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr></table></div> |
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| 589 | |
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| 590 | <p>but does <em>not</em> require modification of the deployment |
|---|
| 591 | descriptor to customize this value.</p> |
|---|
| 592 | |
|---|
| 593 | <p>The valid attributes for a <code><Resource></code> element |
|---|
| 594 | are as follows:</p> |
|---|
| 595 | |
|---|
| 596 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>auth</code></td><td valign="center" align="left"> |
|---|
| 597 | <p>Specify whether the web Application code signs on to the |
|---|
| 598 | corresponding resource manager programatically, or whether the |
|---|
| 599 | Container will sign on to the resource manager on behalf of the |
|---|
| 600 | application. The value of this attribute must be |
|---|
| 601 | <code>Application</code> or <code>Container</code>. This |
|---|
| 602 | attribute is <strong>required</strong> if the web application |
|---|
| 603 | will use a <code><resource-ref></code> element in the web |
|---|
| 604 | application deployment descriptor, but is optional if the |
|---|
| 605 | application uses a <code><resource-env-ref></code> instead.</p> |
|---|
| 606 | </td></tr><tr><td valign="center" align="left"><code>description</code></td><td valign="center" align="left"> |
|---|
| 607 | <p>Optional, human-readable description of this resource.</p> |
|---|
| 608 | </td></tr><tr><td valign="center" align="left"><strong><code>name</code></strong></td><td valign="center" align="left"> |
|---|
| 609 | <p>The name of the resource to be created, relative to the |
|---|
| 610 | <code>java:comp/env</code> context.</p> |
|---|
| 611 | </td></tr><tr><td valign="center" align="left"><code>scope</code></td><td valign="center" align="left"> |
|---|
| 612 | <p>Specify whether connections obtained through this resource |
|---|
| 613 | manager can be shared. The value of this attribute must be |
|---|
| 614 | <code>Shareable</code> or <code>Unshareable</code>. By default, |
|---|
| 615 | connections are assumed to be shareable.</p> |
|---|
| 616 | </td></tr><tr><td valign="center" align="left"><strong><code>type</code></strong></td><td valign="center" align="left"> |
|---|
| 617 | <p>The fully qualified Java class name expected by the web |
|---|
| 618 | application when it performs a lookup for this resource.</p> |
|---|
| 619 | </td></tr></table> |
|---|
| 620 | |
|---|
| 621 | |
|---|
| 622 | </blockquote></td></tr></table> |
|---|
| 623 | |
|---|
| 624 | |
|---|
| 625 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Resource Links"><strong>Resource Links</strong></a></font></td></tr><tr><td><blockquote> |
|---|
| 626 | |
|---|
| 627 | <p>This element is used to create a link to a global JNDI resource. Doing |
|---|
| 628 | a JNDI lookup on the link name will then return the linked global |
|---|
| 629 | resource.</p> |
|---|
| 630 | |
|---|
| 631 | <p>For example, you can create a resource link like this:</p> |
|---|
| 632 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
|---|
| 633 | <Context ...> |
|---|
| 634 | ... |
|---|
| 635 | <ResourceLink name="linkToGlobalResource" |
|---|
| 636 | global="simpleValue" |
|---|
| 637 | type="java.lang.Integer" |
|---|
| 638 | ... |
|---|
| 639 | </Context> |
|---|
| 640 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../images/void.gif"></td></tr></table></div> |
|---|
| 641 | |
|---|
| 642 | <p>The valid attributes for a <code><ResourceLink></code> element |
|---|
| 643 | are as follows:</p> |
|---|
| 644 | |
|---|
| 645 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><strong><code>global</code></strong></td><td valign="center" align="left"> |
|---|
| 646 | <p>The name of the linked global resource in the |
|---|
| 647 | global JNDI context.</p> |
|---|
| 648 | </td></tr><tr><td valign="center" align="left"><strong><code>name</code></strong></td><td valign="center" align="left"> |
|---|
| 649 | <p>The name of the resource link to be created, relative to the |
|---|
| 650 | <code>java:comp/env</code> context.</p> |
|---|
| 651 | </td></tr><tr><td valign="center" align="left"><strong><code>type</code></strong></td><td valign="center" align="left"> |
|---|
| 652 | <p>The fully qualified Java class name expected by the web |
|---|
| 653 | application when it performs a lookup for this resource link.</p> |
|---|
| 654 | </td></tr></table> |
|---|
| 655 | |
|---|
| 656 | </blockquote></td></tr></table> |
|---|
| 657 | |
|---|
| 658 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Transaction"><strong>Transaction</strong></a></font></td></tr><tr><td><blockquote> |
|---|
| 659 | |
|---|
| 660 | <p>You can declare the characteristics of the UserTransaction |
|---|
| 661 | to be returned for JNDI lookup for <code>java:comp/UserTransaction</code>. |
|---|
| 662 | You <strong>MUST</strong> define an object factory class to instantiate |
|---|
| 663 | this object as well as the needed resource parameters as attributes of the |
|---|
| 664 | <code>Transaction</code> |
|---|
| 665 | element, and the properties used to configure that object factory.</p> |
|---|
| 666 | |
|---|
| 667 | <p>The valid attributes for the <code><Transaction></code> element |
|---|
| 668 | are as follows:</p> |
|---|
| 669 | |
|---|
| 670 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><strong><code>factory</code></strong></td><td valign="center" align="left"> |
|---|
| 671 | <p>The class name for the JNDI object factory.</p> |
|---|
| 672 | </td></tr></table> |
|---|
| 673 | |
|---|
| 674 | </blockquote></td></tr></table> |
|---|
| 675 | |
|---|
| 676 | </blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font size="-1" color="#525D76"><em> |
|---|
| 677 | Copyright © 1999-2008, Apache Software Foundation |
|---|
| 678 | </em></font></div></td></tr></table></body></html> |
|---|
