| [66] | 1 | <html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference - The Manager Component</title><meta value="Craig R. McClanahan" name="author"><meta value="craigmcc@apache.org" name="email"><meta value="Yoav Shapira" name="author"><meta value="yoavs@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><!--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 Manager Component</h2></td><td nowrap="true" valign="top" align="right"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></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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| 4 | |
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| 5 | <p>The <strong>Manager</strong> element represents the <em>session |
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| 6 | manager</em> that will be used to create and maintain HTTP sessions |
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| 7 | as requested by the associated web application.</p> |
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| 8 | |
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| 9 | <p>A Manager element MAY be nested inside a |
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| 10 | <a href="context.html">Context</a> component. If it is not included, |
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| 11 | a default Manager configuration will be created automatically, which |
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| 12 | is sufficient for most requirements.</p> |
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| 13 | |
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| 14 | </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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| 15 | |
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| 16 | <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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| 17 | |
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| 18 | <p>All implementations of <strong>Manager</strong> |
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| 19 | support the following attributes:</p> |
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| 20 | |
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| 21 | <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>className</code></td><td valign="center" align="left"> |
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| 22 | <p>Java class name of the implementation to use. This class must |
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| 23 | implement the <code>org.apache.catalina.Manager</code> interface. |
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| 24 | If not specified, the standard value (defined below) will be used.</p> |
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| 25 | </td></tr><tr><td valign="center" align="left"><code>distributable</code></td><td valign="center" align="left"> |
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| 26 | <p>Set to <code>true</code> to ask the session manager to enforce |
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| 27 | the restrictions described in the Servlet Specification on |
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| 28 | distributable applications (primarily, this would mean that all |
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| 29 | session attributes must implement <code>java.io.Serializable</code>). |
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| 30 | Set to <code>false</code> (the default) to not enforce these |
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| 31 | restrictions.</p> |
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| 32 | |
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| 33 | <p><strong>NOTE</strong> - The value for this property is inherited |
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| 34 | automatically based on the presence or absence of the |
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| 35 | <code><distributable></code> element in the web application |
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| 36 | deployment descriptor (<code>/WEB-INF/web.xml</code>).</p> |
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| 37 | </td></tr></table> |
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| 38 | |
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| 39 | </blockquote></td></tr></table> |
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| 40 | |
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| 41 | |
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| 42 | <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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| 43 | |
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| 44 | <p>Tomcat provides two standard implementations of <strong>Manager</strong> |
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| 45 | for use - the default one stores active sessions, while the optional one |
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| 46 | stores active sessions that have been swapped out (in addition to saving |
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| 47 | sessions across a restart of Tomcat) in a storage location that is selected |
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| 48 | via the use of an appropriate <strong>Store</strong> nested element.</p> |
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| 49 | |
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| 50 | <h3>Standard Manager Implementation</h3> |
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| 51 | |
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| 52 | <p>The standard implementation of <strong>Manager</strong> is |
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| 53 | <strong>org.apache.catalina.session.StandardManager</strong>. |
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| 54 | It supports the following additional attributes (in addition to the |
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| 55 | common attributes listed above):</p> |
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| 56 | |
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| 57 | <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>algorithm</code></td><td valign="center" align="left"> |
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| 58 | <p>Name of the <em>Message Digest</em> algorithm used to calculate |
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| 59 | session identifiers produced by this Manager. This value must |
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| 60 | be supported by the <code>java.security.MessageDigest</code> class. |
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| 61 | If not specified, the default value is "MD5".</p> |
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| 62 | </td></tr><tr><td valign="center" align="left"><code>entropy</code></td><td valign="center" align="left"> |
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| 63 | <p>A String value that is utilized when seeding the random number |
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| 64 | generator used to create session identifiers for this Manager. |
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| 65 | If not specified, a semi-useful value is calculated, but a long |
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| 66 | String value should be specified in security-conscious |
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| 67 | environments.</p> |
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| 68 | </td></tr><tr><td valign="center" align="left"><code>maxActiveSessions</code></td><td valign="center" align="left"> |
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| 69 | <p>The maximum number of active sessions that will be created by |
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| 70 | this Manager, or -1 (the default) for no limit.</p> |
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| 71 | </td></tr><tr><td valign="center" align="left"><code>maxInactiveInterval</code></td><td valign="center" align="left"> |
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| 72 | <p>The initial maximum time interval, in seconds, |
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| 73 | between client requests before a session is invalidated. A negative value |
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| 74 | will result in sessions never timing out. If the attribute is not provided, |
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| 75 | a default of 60 seconds is used.</p> |
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| 76 | |
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| 77 | <p>This attribute provides the initial value whenever a |
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| 78 | new session is created, but the interval may be dynamically |
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| 79 | varied by a servlet via the |
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| 80 | <code>setMaxInactiveInterval</code> method of the <code>HttpSession</code> object.</p> |
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| 81 | </td></tr><tr><td valign="center" align="left"><code>pathname</code></td><td valign="center" align="left"> |
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| 82 | <p>Absolute or relative (to the work directory for this Context) |
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| 83 | pathname of the file in which session state will be preserved |
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| 84 | across application restarts, if possible. The default is |
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| 85 | "SESSIONS.ser". See <a href="#Restart Persistence">Restart |
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| 86 | Persistence</a> for more information. Restart persistence may be |
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| 87 | disabled by setting this attribute to an empty string.</p> |
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| 88 | </td></tr><tr><td valign="center" align="left"><code>processExpiresFrequency</code></td><td valign="center" align="left"> |
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| 89 | <p>Frequency of the session expiration, and related manager operations. |
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| 90 | Manager operations will be done once for the specified amount of |
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| 91 | backgrondProcess calls (ie, the lower the amount, the more often the |
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| 92 | checks will occur). The minimum value is 1, and the default value is 6. |
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| 93 | </p> |
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| 94 | </td></tr><tr><td valign="center" align="left"><code>randomClass</code></td><td valign="center" align="left"> |
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| 95 | <p>Java class name of the <code>java.util.Random</code> |
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| 96 | implementation class to use. If not specified, the default value is |
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| 97 | <code>java.security.SecureRandom</code>.</p> |
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| 98 | </td></tr><tr><td valign="center" align="left"><code>sessionIdLength</code></td><td valign="center" align="left"> |
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| 99 | <p>The length of session ids created by this Manager, excluding any |
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| 100 | JVM route information used for load balancing. |
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| 101 | The default is 16.</p> |
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| 102 | </td></tr></table> |
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| 103 | |
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| 104 | <h3>Persistent Manager Implementation</h3> |
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| 105 | |
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| 106 | <p><em><strong>WARNING - Use of this Manager implementation |
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| 107 | has not been thoroughly tested, and should be considered experimental! |
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| 108 | </strong></em></p> |
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| 109 | |
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| 110 | <p>The persistent implementation of <strong>Manager</strong> is |
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| 111 | <strong>org.apache.catalina.session.PersistentManager</strong>. In |
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| 112 | addition to the usual operations of creating and deleting sessions, a |
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| 113 | <code>PersistentManager</code> has the capability to swap active (but |
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| 114 | idle) sessions out to a persistent storage mechanism, as well as to save |
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| 115 | all sessions across a normal restart of Tomcat. The actual persistent |
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| 116 | storage mechanism used is selected by your choice of a |
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| 117 | <strong>Store</strong> element nested inside the <strong>Manager</strong> |
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| 118 | element - this is required for use of <code>PersistentManager</code>.</p> |
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| 119 | |
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| 120 | <p>This implementation of Manager supports the following attributes in |
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| 121 | addition to the <a href="#Common Attributes">Common Attributes</a> |
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| 122 | described earlier.</p> |
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| 123 | |
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| 124 | <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>algorithm</code></td><td valign="center" align="left"> |
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| 125 | <p>Name of the <em>Message Digest</em> algorithm used to calculate |
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| 126 | session identifiers produced by this Manager. This value must |
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| 127 | be supported by the <code>java.security.MessageDigest</code> class. |
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| 128 | If not specified, the default value is "MD5".</p> |
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| 129 | </td></tr><tr><td valign="center" align="left"><code>className</code></td><td valign="center" align="left"> |
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| 130 | <p>Java class name of the implementation to use. This class must |
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| 131 | implement the <code>org.apache.catalina.Manager</code> interface. |
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| 132 | You <strong>must</strong> specify |
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| 133 | <code>org.apache.catalina.session.PersistentManager</code> to use |
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| 134 | this manager implementation.</p> |
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| 135 | </td></tr><tr><td valign="center" align="left"><code>entropy</code></td><td valign="center" align="left"> |
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| 136 | <p>A String value that is utilized when seeding the random number |
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| 137 | generator used to create session identifiers for this Manager. |
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| 138 | If not specified, a semi-useful value is calculated, but a long |
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| 139 | String value should be specified in security-conscious |
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| 140 | environments.</p> |
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| 141 | </td></tr><tr><td valign="center" align="left"><code>maxActiveSessions</code></td><td valign="center" align="left"> |
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| 142 | <p>The maximum number of active sessions that will be created by |
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| 143 | this Manager, or -1 (the default) for no limit.</p> |
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| 144 | </td></tr><tr><td valign="center" align="left"><code>maxIdleBackup</code></td><td valign="center" align="left"> |
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| 145 | <p>The time interval (in seconds) since the last access to a session |
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| 146 | before it is eligible for being persisted to the session store, or |
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| 147 | <code>-1</code> to disable this feature. By default, this feature is |
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| 148 | disabled.</p> |
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| 149 | </td></tr><tr><td valign="center" align="left"><code>maxIdleSwap</code></td><td valign="center" align="left"> |
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| 150 | <p>The time interval (in seconds) since the last access to a session |
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| 151 | before it should be persisted to the session store, and |
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| 152 | passivated out of the server's memory, or <code>-1</code> to disable |
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| 153 | this feature. If this feature is enabled, the time interval specified |
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| 154 | here should be equal to or longer than the value specified for |
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| 155 | <code>maxIdleBackup</code>. By default, this feature is disabled.</p> |
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| 156 | </td></tr><tr><td valign="center" align="left"><code>minIdleSwap</code></td><td valign="center" align="left"> |
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| 157 | <p>The time interval (in seconds) since the last access to a session |
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| 158 | before it will be eligible to be persisted to the session store, and |
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| 159 | passivated out of the server's memory, or <code>-1</code> for this |
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| 160 | swapping to be available at any time. If specified, this value should |
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| 161 | be less than that specified by <code>maxIdleSwap</code>. By default, |
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| 162 | this value is set to <code>-1</code>.</p> |
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| 163 | </td></tr><tr><td valign="center" align="left"><code>maxInactiveInterval</code></td><td valign="center" align="left"> |
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| 164 | <p>The initial maximum time interval, in seconds, |
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| 165 | between client requests before a session is invalidated. A negative value |
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| 166 | will result in sessions never timing out. If the attribute is not provided, |
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| 167 | a default of 60 seconds is used.</p> |
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| 168 | |
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| 169 | <p>This attribute provides the initial value whenever a |
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| 170 | new session is created, but the interval may be dynamically |
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| 171 | varied by a servlet via the |
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| 172 | <code>setMaxInactiveInterval</code>method of the <code>HttpSession</code> object.</p> |
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| 173 | </td></tr><tr><td valign="center" align="left"><code>randomClass</code></td><td valign="center" align="left"> |
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| 174 | <p>Java class name of the <code>java.util.Random</code> |
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| 175 | implementation class to use. If not specified, the default value is |
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| 176 | <code>java.security.SecureRandom</code>.</p> |
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| 177 | </td></tr><tr><td valign="center" align="left"><code>saveOnRestart</code></td><td valign="center" align="left"> |
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| 178 | <p>Should all sessions be persisted and reloaded when Tomcat is shut |
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| 179 | down and restarted (or when this application is reloaded)? By default, |
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| 180 | this attribute is set to <code>true</code>.</p> |
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| 181 | </td></tr><tr><td valign="center" align="left"><code>sessionIdLength</code></td><td valign="center" align="left"> |
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| 182 | <p>The length of session ids created by this Manager, excluding any |
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| 183 | JVM route information used for load balancing. |
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| 184 | The default is 16.</p> |
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| 185 | </td></tr></table> |
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| 186 | |
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| 187 | <p>In order to successfully use a PersistentManager, you must nest inside |
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| 188 | it a <strong><Store></strong> element, as described below.</p> |
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| 189 | |
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| 190 | </blockquote></td></tr></table> |
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| 191 | |
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| 192 | |
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| 193 | </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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| 194 | |
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| 195 | <h3>Standard Manager Implementation</h3> |
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| 196 | |
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| 197 | <p>If you are using the <em>Standard Manager Implementation</em> |
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| 198 | as described above, no elements may be nested inside your |
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| 199 | <strong><Manager></strong> element.</p> |
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| 200 | |
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| 201 | <h3>Persistent Manager Implementation</h3> |
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| 202 | |
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| 203 | <p>If you are using the <em>Persistent Manager Implementation</em> |
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| 204 | as described above, you <strong>MUST</strong> nest a |
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| 205 | <strong><Store></strong> element inside, which defines the |
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| 206 | characteristics of the persistent data storage. Two implementations |
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| 207 | of the <code><Store></code> element are currently available, |
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| 208 | with different characteristics, as described belowl</p> |
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| 209 | |
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| 210 | <h5>File Based Store</h5> |
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| 211 | |
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| 212 | <p>The <em>File Based Store</em> implementation saves swapped out |
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| 213 | sessions in individual files (named based on the session identifier) |
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| 214 | in a configurable directory. Therefore, you are likely to encounter |
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| 215 | scalability problems as the number of active sessions increases, and |
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| 216 | this should primarily be considered a means to easily experiment.</p> |
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| 217 | |
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| 218 | <p>To configure this, add a <code><Store></code> nested inside |
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| 219 | your <code><Manager></code> element with the following attributes: |
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| 220 | </p> |
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| 221 | |
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| 222 | <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>checkInterval</code></td><td valign="center" align="left"> |
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| 223 | <p>The interval (in seconds) between checks for expired sessions |
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| 224 | among those sessions that are currently swapped out. By default, |
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| 225 | this interval is set to 60 seconds (one minute).</p> |
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| 226 | </td></tr><tr><td valign="center" align="left"><strong><code>className</code></strong></td><td valign="center" align="left"> |
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| 227 | <p>Java class name of the implementation to use. This class must |
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| 228 | implement the <code>org.apache.catalina.Store</code> interface. You |
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| 229 | <strong>must</strong> specify |
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| 230 | <code>org.apache.catalina.session.FileStore</code> |
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| 231 | to use this implementation.</p> |
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| 232 | </td></tr><tr><td valign="center" align="left"><code>directory</code></td><td valign="center" align="left"> |
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| 233 | <p>Absolute or relative (to the temporary work directory for this web |
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| 234 | application) pathname of the directory into which individual session |
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| 235 | files are written. If not specified, the temporary work directory |
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| 236 | assigned by the container is utilized.</p> |
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| 237 | </td></tr></table> |
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| 238 | |
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| 239 | |
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| 240 | <h5>JDBC Based Store</h5> |
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| 241 | |
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| 242 | <p>The <em>JDBC Based Store</em> implementation saves swapped out |
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| 243 | sessions in individual rows of a preconfigured table in a database |
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| 244 | that is accessed via a JDBC driver. With large numbers of swapped out |
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| 245 | sessions, this implementation will exhibit improved performance over |
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| 246 | the File Based Store described above.</p> |
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| 247 | |
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| 248 | <p>To configure this, add a <code><Store></code> nested inside |
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| 249 | your <code><Manager></code> element with the following attributes: |
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| 250 | </p> |
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| 251 | |
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| 252 | <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>checkInterval</code></td><td valign="center" align="left"> |
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| 253 | <p>The interval (in seconds) between checks for expired sessions |
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| 254 | among those sessions that are currently swapped out. By default, |
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| 255 | this interval is set to 60 seconds (one minute).</p> |
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| 256 | </td></tr><tr><td valign="center" align="left"><strong><code>className</code></strong></td><td valign="center" align="left"> |
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| 257 | <p>Java class name of the implementation to use. This class must |
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| 258 | implement the <code>org.apache.catalina.Store</code> interface. You |
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| 259 | <strong>must</strong> specify |
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| 260 | <code>org.apache.catalina.session.JDBCStore</code> |
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| 261 | to use this implementation.</p> |
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| 262 | </td></tr><tr><td valign="center" align="left"><strong><code>connectionURL</code></strong></td><td valign="center" align="left"> |
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| 263 | <p>The connection URL that will be handed to the configured JDBC |
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| 264 | driver to establish a connection to the database containing our |
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| 265 | session table.</p> |
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| 266 | </td></tr><tr><td valign="center" align="left"><strong><code>driverName</code></strong></td><td valign="center" align="left"> |
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| 267 | <p>Java class name of the JDBC driver to be used.</p> |
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| 268 | </td></tr><tr><td valign="center" align="left"><strong><code>sessionAppCol</code></strong></td><td valign="center" align="left"> |
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| 269 | <p>Name of the database column, contained in the specified session |
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| 270 | table, that contains the Engine, Host, and Web Application Context |
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| 271 | name in the format <code>/Engine/Host/Context</code>.</p> |
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| 272 | </td></tr><tr><td valign="center" align="left"><strong><code>sessionDataCol</code></strong></td><td valign="center" align="left"> |
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| 273 | <p>Name of the database column, contained in the specified |
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| 274 | session table, that contains the serialized form of all session |
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| 275 | attributes for a swapped out session. The column type must accept |
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| 276 | a binary object (typically called a BLOB).</p> |
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| 277 | </td></tr><tr><td valign="center" align="left"><strong><code>sessionIdCol</code></strong></td><td valign="center" align="left"> |
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| 278 | <p>Name of the database column, contained in the specified |
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| 279 | session table, that contains the session identifier of the |
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| 280 | swapped out session. The column type must accept character |
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| 281 | string data of at least as many characters as are contained |
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| 282 | in session identifiers created by Tomcat (typically 32).</p> |
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| 283 | </td></tr><tr><td valign="center" align="left"><strong><code>sessionLastAccessedCol</code></strong></td><td valign="center" align="left"> |
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| 284 | <p>Name of the database column, contained in the specified |
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| 285 | session table, that contains the <code>lastAccessedTime</code> |
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| 286 | property of this session. The column type must accept a |
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| 287 | Java <code>long</code> (64 bits).</p> |
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| 288 | </td></tr><tr><td valign="center" align="left"><strong><code>sessionMaxInactiveCol</code></strong></td><td valign="center" align="left"> |
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| 289 | <p>Name of the database column, contained in the specified |
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| 290 | session table, that contains the <code>maxInactiveInterval</code> |
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| 291 | property of this session. The column type must accept a |
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| 292 | Java <code>integer</code> (32 bits).</p> |
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| 293 | </td></tr><tr><td valign="center" align="left"><strong><code>sessionTable</code></strong></td><td valign="center" align="left"> |
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| 294 | <p>Name of the database table to be used for storing swapped out |
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| 295 | sessions. This table must contain (at least) the database columns |
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| 296 | that are configured by the other attributes of this element.</p> |
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| 297 | </td></tr><tr><td valign="center" align="left"><strong><code>sessionValidCol</code></strong></td><td valign="center" align="left"> |
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| 298 | <p>Name of the database column, contained in the specified |
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| 299 | session table, that contains a flag indicating whether this |
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| 300 | swapped out session is still valid or not. The column type |
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| 301 | must accept a single character.</p> |
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| 302 | </td></tr></table> |
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| 303 | |
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| 304 | <p>Before attempting to use the JDBC Based Store for the first time, |
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| 305 | you must create the table that will be used to store swapped out sessions. |
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| 306 | Detailed SQL commands vary depending on the database you are using, but |
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| 307 | a script like this will generally be required:</p> |
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| 308 | |
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| 309 | <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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| 310 | create table tomcat_sessions ( |
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| 311 | session_id varchar(100) not null primary key, |
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| 312 | valid_session char(1) not null, |
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| 313 | max_inactive int not null, |
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| 314 | last_access bigint not null, |
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| 315 | app_name varchar(255), |
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| 316 | session_data mediumblob, |
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| 317 | KEY kapp_name(app_name) |
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| 318 | ); |
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| 319 | </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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| 320 | |
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| 321 | <p>In order for the JDBC Based Store to successfully connect to your |
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| 322 | database, the JDBC driver you configure must be visible to Tomcat's |
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| 323 | internal class loader. Generally, that means you must place the JAR |
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| 324 | file containing this driver into the <code>$CATALINA_HOME/lib</code> |
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| 325 | directory.</p> |
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| 326 | |
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| 327 | </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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| 328 | |
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| 329 | |
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| 330 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Restart Persistence"><strong>Restart Persistence</strong></a></font></td></tr><tr><td><blockquote> |
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| 331 | |
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| 332 | <p>Whenver Catalina is shut down normally and restarted, or when an |
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| 333 | application reload is triggered, the standard Manager implementation |
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| 334 | will attempt to serialize all currently active sessions to a disk |
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| 335 | file located via the <code>pathname</code> attribute. All such saved |
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| 336 | sessions will then be deserialized and activated (assuming they have |
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| 337 | not expired in the mean time) when the application reload is completed.</p> |
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| 338 | |
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| 339 | <p>In order to successfully restore the state of session attributes, |
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| 340 | all such attributes MUST implement the <code>java.io.Serializable</code> |
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| 341 | interface. You MAY cause the Manager to enforce this restriction by |
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| 342 | including the <code><distributable></code> element in your web |
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| 343 | application deployment descriptor (<code>/WEB-INF/web.xml</code>).</p> |
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| 344 | |
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| 345 | </blockquote></td></tr></table> |
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| 346 | |
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| 347 | </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> |
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| 348 | Copyright © 1999-2008, Apache Software Foundation |
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| 349 | </em></font></div></td></tr></table></body></html> |
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