Solve : java.lang.NullPointerException?

1.	Solve : java.lang.NullPointerException?
Answer» I am a beginner in Java programming, and I am writing my first program. I am really enjoying it, but now I have a problem which I cannot solve. Each time I am building the code I dont get any error, but when I run it the following error is displayed. Exception in thread "MAIN" java.lang.NullPointerException The code is the following : public class MAINCLASS { public static void main(String args[]) { Case[] CASES = new Case [2]; INT c_location, s_location, ISBN_no; for(int counter1 = 0; counter1 < 2; counter1 ++ ){ for(int COUNTER2 = 0; counter2 < 5; counter2 ++ ){ for(int counter3 = 0; counter3 < 20; counter3 ++ ){ cases[counter1].shelf[counter2].book[counter3] = new Book((counter3),(counter3 + 1),(counter3 + 2)); } } } } } Any help please ?

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