One issue is that the exceptions only show up for a registered user, and the user management system has its own bugs, so you have to be the global admin to see them.
The other issue is that the static linking isn't working to filesystem files from tomcat. This is a separate issue that should be fixed first.
Finally, there are various layers of XML translation and substitution, and these process error pages, stacktraces, source code pointers, etc. They really shouldn't. There is a dynamide feature call DynamideHandledException, and anything that has been logged and transformed should get this kind of exception wrapper, so it can take the express train through the call stack all the way up to DynamideServlet.
This issue depends on https://sourceforge.net/tracker/index.php?func=detail&aid=3303665&group_id=545776&atid=2215530