correctly printstacktrace of servlet exception

Question

so i am using a filter to catch servlet exception (because we are using a mix of jsf/plain servlets)

when catching the ServletException and calling printstacktrace most of the information is lost.

the "true" root exception seems to be hidden behind the "funny" expression

((ServletException) e.getRootCause().getCause()).getRootCause().getCause().getCause().getCause()

this is clearly not the way to do it.

is the an easy way to print the "full" information of such an exception. can someone explain me why the exception is wrapped this way?

Answer 1

Take a look at the ExceptionUtils class from commons-lang. It contains several useful methods for printing the entire chain of exceptions.

Answer 2

after i had a look at ExceptionUtils, this solved the problem!

    final StringWriter stacktrace = new StringWriter();
    ExceptionUtils.printRootCauseStackTrace(throwable,new PrintWriter(stacktrace));
    msg.append(stacktrace.getBuffer());

this prints out the full stacktrace with every piece of information that is relevant.