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

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java.lang.NullPointerException:
at java.nio.charset.Charset.put(Charset.java:550)
at java.nio.charset.Charset.access$300(Charset.java:276)
at java.nio.charset.Charset$4.run(Charset.java:593)
at java.nio.charset.Charset$4.run(Charset.java:585)
at java.security.AccessController.doPrivileged(Native Method)
at pack.TestCase.main(TestCase.java:9)

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