print the class of the object(or the source code) that cause null pointer exception in Java

Let's say there is a NullPointerException and I catch it. Can I somehow retrieve the name of the object that was null? or 'most probably' was null? Or even better - retrieving the source code that the exception most likely occurred?

We have a regression with thousands of tests, and many tests fail msg is something like "NPE in line number.." So we need to go to the source code of the test and see what was null... I would like to be able to put this info in the test log and to save us lots of time. Thanks