I go this error in my weblogic server today. My application team kept telling me that it had to be with the server configuration and I finally decided to delve deeper..

<> <[ServletContext(id=8392120)] Root cause of ServletException.

javax.servlet.jsp.JspTagException at com.qm.common.presentation.taglib.XsltTag.doEndTag(XsltTag.java:161) etc. etc..

-- The BEA documentation has the following information

BEA-101017
Error: [context] Root cause of ServletException.
Description: [context] Root cause of ServletException, which the Web application container caught while servicing the request.
*Cause:*The Web application container caught an unexpected exception.
Action:Check the exception for the exact error message.

-- On discussion with some of the experts, it clearly shows that 101017 is just a general exception like ORA-6512 is in the oracle database. It just indicates that something abnormal has happened and that it needs to be investigated.

I got my application team back on line and started re-investigating what changes have happened in the code before/after the exception and when we got to the root cause it ended up as an issue with one of the classes in the application.