It is necessary to configure WebLogic so that it compiles your JSP pages with debugging information. You will need to edit the weblogic.xml file as follows to get the desired result:

Code:

<!DOCTYPE weblogic-web-app PUBLIC "-//BEA  Systems, Inc.//DTD Web Application 7.0//EN"  "http://www.bea.com/servers/wls700/dtd/weblogic700-web-jar.dtd">  <weblogic-web-app>     <description>WebLogic Descriptor</description>     <jsp-descriptor>        <jsp-param>           <param-name>debug</param-name>           <param-value>true</param-value>        </jsp-param>     </jsp-descriptor>  </weblogic-web-app>

See the original thread here.