When using Java Kerberos impl to generate MIC token by calling
GSSContext.getMIC() with default message prop (i.e. null as specified
in its javadoc), an NPE is thrown with the following stack trace:

Exception in thread "main" java.lang.NullPointerException
        at sun.security.jgss.krb5.MessageToken.genSignAndSeqNumber(MessageToken.java:284)
        at sun.security.jgss.krb5.MicToken.<init>(MicToken.java:58)
        at sun.security.jgss.krb5.Krb5Context.getMIC(Krb5Context.java:1028)
        at sun.security.jgss.GSSContextImpl.getMIC(GSSContextImpl.java:434)
        at TestSanity.testContext(TestSanity.java:246)


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