How to print stack trace of an exception in a velocity template

Question

How to print the complete stack trace of the exception using a velocity template

My present template has $exception as template variable, which contains the exception.

Answer 1

In case you want to display the trace on the output you could wrap the evaluate method inside try-catch-finally block. In catch write the stack trace or just the message of the exception to the writer. In the finally section just flush the writer.

Something like this if I remember right:

StringWriter w = new StringWriter();
try {
    Velocity.evaluate( context, w, "mystring", s );
} catch (Exceptions... e)
    w.write(e.getMessage());
} finally {
    w.flush();
}

Answer 2

In velocity this is how i solved this problem.

#foreach ($i in [1..3])     
   #if($exception.Cause)
           #set($exception = $exception.Cause)
           #foreach($stack in $exception.getStackTrace())
            $stack.toString()
           #end     
    #end
#end