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

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This exception has no message.
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java.lang.NullPointerException:
at java.util.Arrays.mergeSort(Arrays.java:1124)
at java.util.Arrays.mergeSort(Arrays.java:1131)
at java.util.Arrays.mergeSort(Arrays.java:1131)
at java.util.Arrays.mergeSort(Arrays.java:1131)
at java.util.Arrays.mergeSort(Arrays.java:1131)
at java.util.Arrays.mergeSort(Arrays.java:1131)
at java.util.Arrays.sort(Arrays.java:1074)
at undefined.Strings.main(Strings.java:50)

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