java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.test.ds.Comp.compare(Main.java:12)
at com.test.ds.Comp.compare(Main.java:1)
at java.util.Arrays.mergeSort(Arrays.java:1284)
at java.util.Arrays.sort(Arrays.java:1223)
at java.util.Collections.sort(Collections.java:159)
at com.test.ds.TupleList.sort(TupleList.java:20)
at com.test.ds.Main.main(Main.java:38)

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