What to do to NullPointerExeption?

My Java-code gives "java.lang.NullPointerExeption".
Please tell what usually makes it, and why it comes
also when I have "commented" almost everything out (only Thread and while-loop left).
sanctAsked:
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pc012197Commented:
A NullPointerException is generated when you try to access a method or variable in the 'null' object. Usually it is caused by accessing reference variables without assigned them to an object first.

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