I’m sure every Java developer has had some hard times with NPEs (NullPointerException) since Java doesn’t really have a nice mechanism to avoid them :) Let’s recall something here: NPE is a run time exception and it occurs in the run time, therefore it means it is a design mistake, bad code quality or careless programming. Anyways, whatever the reason is, we all see NPEs all over our codes :) In this post, I want to cover this issue and give some tips from my experience so far.

In the last post, I tried to roughly touch Unit Tests and what/how many and when to test our Units. For more information about that topic, please go back to first article.