If the server uses privacy when the context established does not support , an exception is thrown:
java.lang.ArrayIndexOutOfBoundsException
        at sun.security.jgss.krb5.WrapToken.desCbcDecrypt(WrapToken.java:435)
        at sun.security.jgss.krb5.WrapToken.getDataFromBuffer(WrapToken.java:236)
        at sun.security.jgss.krb5.WrapToken.getData(WrapToken.java:198)
        at sun.security.jgss.krb5.WrapToken.getData(WrapToken.java:171)
        at sun.security.jgss.krb5.Krb5Context.unwrap(Krb5Context.java:737)
        at sun.security.jgss.GSSContextImpl.unwrap(GSSContextImpl.java:362)
        at Server.exchangeMessages(Server.java:130)
        at Server.run(Server.java:102)