JUnit test nullPointerException

Hey guys, I'm new to JUnit testing and java and i'm attempting my first JUnit test:

Code:

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        @Test
        public final void testColour() {
                // run the main function
                Main.MainControls testC = new Main.MainControls();

                for (int i = 0; i < Main.N; i++) {
                Main.playerObject.setX(Main.barriers[i].getX());
                Main.playerObject.setY(Main.barriers[i].getY());
                Main.mugeTest.update(20);
                }

                for (int i = 0; i < Main.N; i++) {

                        System.out.println(Main.playerObject.getX());
                        testC.update(20);
                        assertEquals(0.1, Main.barriers[i].getColour(i),0.00001);
                }

        }

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and I keep getting a nullPointerException at

Code:

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                Main.playerObject.setX(Main.barriers[i].getX());

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Can anyone advise me what could be incorrect?

Quote:

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Originally Posted by danboy4

Can anyone advise me what could be incorrect?

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Too much :)
- Main.playerObject could be null
- but I suspect Main.barriers[i] is null. Do you have created that array? -> barriers = new ....[...]; ?

Debug your code (best with a debugger)! Or System.out.print(Main.playerObject) ? System.out.print(barriers[0]) ? ....
NPE are easy to find and fix