Recipe 11.2 Setting the Session Timeout in All Tomcat Web Applications


Problem

You want to configure a session timeout period for all of the web applications that are running within an instance of Tomcat.

Solution

Set the session timeout within the session-config element in <Tomcat-installation-directory>/conf/web.xml .

Discussion

You can set the session timeout for all web applications by configuring Tomcat's default conf / web.xml file. If the deployment descriptor for a particular web application does not have a session-config element, then the application uses the value set in conf/web.xml as the default session timeout. The content of the session-timeout element (nested within session-config ) represents the time in minutes until an inactive session expires .

Example 11-4 shows the session-config element in the default web.xml file for Tomcat 4.1.x, with the accompanying XML comment.

Example 11-4. The session-config element inside of the default Tomcat web.xml file
 <!--=================== Default Session Configuration ================--> <!-- You can set the default session timeout (in minutes) for all newly--> <!-- created sessions by modifying the value below.-->     <session-config>         <session-timeout>30</session-timeout>     </session-config> 

On application deployment, Tomcat processes its default web.xml file, followed by the deployment descriptors for each web application. Your own session-config element overrides the one specified in conf/web.xml . It is usually a better idea to configure sessions for each web application individually, particularly if they are designed to be portable.

See Also

Recipe 11.1 on configuring the session timeout; Recipe 11.3 on setting the session timeout programmatically; Recipe 11.4 on checking the validity of a session; Chapter 1 on web.xml ; Chapter 7 of the Servlet v2.3 and 2.4 specifications on sessions; the session-tracking sections of Java Servlet Programming by Jason Hunter (O'Reilly) and JavaServer Pages by Hans Bergsten (O'Reilly).



Java Servlet & JSP Cookbook
Java Servlet & JSP Cookbook
ISBN: 0596005725
EAN: 2147483647
Year: 2004
Pages: 326

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