app/src/main/webapp/WEB-INF/sun-web.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sun-web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Application Server 8.1 Servlet 2.4//EN" "http://www.sun.com/software/appserver/dtds/sun-web-app_2_4-1.dtd">
<sun-web-app error-url="">
  <context-root>/</context-root>
  <session-config>
    <session-manager persistence-type="memory">
        </session-manager>
  </session-config>
  <resource-ref>
    <res-ref-name>jdbc/rollerdb</res-ref-name>
    <jndi-name>jdbc/rollerdb</jndi-name>
  </resource-ref>
  <resource-ref>
    <res-ref-name>mail/Session</res-ref-name>
    <jndi-name>mail/Session</jndi-name>
  </resource-ref>
</sun-web-app>