Using SunNativeGSS provider, initiator create a security context , and set requestCredDeleg=true. After a security context has been established, on server side,
getCredDelegState() will return false.
And if acceptor call getDelegCred() directly, it will throw NullPointerException.
Please see:
ERROR: java.lang.NullPointerException
java.lang.NullPointerException
        at sun.security.jgss.GSSCredentialImpl.<init>(GSSCredentialImpl.java:94)
        at sun.security.jgss.GSSContextImpl.getDelegCred(GSSContextImpl.java:618)
        at Server.impersonateClient(Server.java:220)
        at Server.run(Server.java:113)
        at java.lang.Thread.run(Thread.java:603)

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