Exception handling of exceptions thrown in jsp's

[jbang]

Currently I use SimpleMappingExceptionResolver to show the users an appropriate error page and log the exception to a log file when an exception is thrown in a controller.

The SimpleMappingExceptionResolver only handles exceptions thrown in controllers and not exceptions thrown when rendering a jsp.

Is there a similar mechanism for jsp's? Ie. a mechanism allowing me to catch exceptions thrown while rendering a jsp, show the user an error page and log the exception to a log file?

Best regards,
Jørgen

[jbang]

OK, sorted it out myself. Had to add an isErrorPage="true" and after that I am able to access the exception:

<%@ page isErrorPage="true" import="org.apache.log4j.Logger"%>
...
<%
   Logger.getLogger&#40;"exception.jsp"&#41;.error&#40;exception&#41;;
   Logger.getLogger&#40;"exception.jsp"&#41;.error&#40;exception.getCause&#40;&#41;&#41;;
%>

The problem now is that debugging shows me that a NullPointerException is thrown when rendering the jsp but the printout from the code above is org.apache.jasper.JasperException?!
Is there a way to print out the root cause ie. the NullPointerException?

Cheers from sunny Denmark,
Jørgen

[jbang]

Got the root cause by casting the Exception to a ServletException ie.:

<%
  if &#40;exception instanceof ServletException&#41; &#123;
    ServletException servletException = &#40;ServletException&#41; exception;
    Logger.getLogger&#40;"exception.jsp"&#41;.error&#40;servletException.getRootCause&#40;&#41;&#41;;
    Logger.getLogger&#40;"exception.jsp"&#41;.error&#40;servletException.getRootCause&#40;&#41;.getCause&#40;&#41;&#41;;
  &#125; else &#123;
    Logger.getLogger&#40;"exception.jsp"&#41;.error&#40;exception&#41;;
    Logger.getLogger&#40;"exception.jsp"&#41;.error&#40;exception.getCause&#40;&#41;&#41;;
  &#125;
%>

/Jørgen