Debugging issue in Spring proxy

Question

So, I'm trying to fix a bug on a fairly complex Spring based webapp. The bug is a NullPointer Exception, but, rather unhelpfully, it's not returning a stacktrace or anything similarly helpful to let me know exactly where it is occurring.

Stepping through the execution of the programme with IntelliJ shows that the exception is occurring in a Spring Proxy object: $Proxy338 , but doesn't show the proxy code.

I'm sorry for being so vague: The error reporting on this bug is pretty unhelpful. Any suggestions for how I should proceed from here would be welcome: should I be looking for AOP/transaction code which is producing the failing proxy? Is there more information I could gather with IntelliJ which would let me pinpoint exactly what is going on?

Answer 1

You could also try retrieving the proxied object to see where exactly the NullPointerExeption is thrown.

To get the proxied object:

((Advised)yourProxy).getTargetSource().getTarget();