tools/jetty/conf/webdefaults.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">   

<!-- ===================================================================== -->
<web-app>
  <description>
    This file is applied to a Web application before it's own WEB-INF/web.xml file
  </description>

  <!-- ==================================================================== -->
  <!-- Context params to control Session Cookies                            -->
  <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  -->
  <!-- UNCOMMENT TO ACTIVATE
  <context-param>
    <param-name>org.mortbay.jetty.servlet.SessionDomain</param-name>
    <param-value>127.0.0.1</param-value>
  </context-param>

  <context-param>
    <param-name>org.mortbay.jetty.servlet.SessionPath</param-name>
    <param-value>/</param-value>
  </context-param>

  <context-param>
    <param-name>org.mortbay.jetty.servlet.MaxAge</param-name>
    <param-value>-1</param-value>
  </context-param>
  -->

  <!-- ==================================================================== -->
  <session-config>
    <session-timeout>30</session-timeout>
  </session-config>

</web-app>