When I throw a JspException from a custom tag the PageContext handlePageException() method wraps it in a ServletException and then Tomcat JspServletWrapper.service() wraps that in a JasperException (which is also a ServletException). So the original exception is 3 deep and the stack trace of the original exception is not reported in the log (and if there is no message, as with a NullPointerException, then there is not even a message about what happened). So there is little or no useful diagnostics. What is the rationale for this behavior? It seems like the service() method should not wrap a ServletException inside a JasperException.
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