Common Portlet Issues
"Pre-existing session required" error
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11:51:09,376 [TP-Processor3] DEBUG servlet.DispatcherServlet - Could not complete request
org.springframework.web.HttpSessionRequiredException: Pre-existing session required but none found
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This error often occurs in portlets that make use of the AjaxPortletSupport library when Tomcat is not configured to share information between portlet and servlet sessions. Please see the documentation on setting emptySessionPath="true" in Installing Tomcat.
Interactive debugging
Interactive debugging with the Sysdeo Tomcat Plugin
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