NullPointerException in Java: Causes and Ways to Avoid It

NullPointerException: The Most Common Exception

NullPointerException (NPE) is the most common exception in Java. The cause of this exception is known but looks like that in most cases developers prefer to ignore it and don't take any action. I personally expect that reasons for such behavior are the following: 

• Most of the developers don't see any problem here and recognize all NPE exceptions as the developer's fault. 
• Developers who are aware of this design problem don't know how to fix it. 

In this article, I'll explain what is the root of this problem and provide ways to fix that problem.

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