the jtreg test CloseServer fails time to time with the following trace info :

     [exec] java.lang.NullPointerException
     [exec] at javax.management.remote.generic.GenericConnector.close(GenericConnector.java:308)
     [exec] at javax.management.remote.generic.GenericConnector.close(GenericConnector.java:225)
     [exec] at CloseServerTest.test(CloseServerTest.java:125)
     [exec] at CloseServerTest.main(CloseServerTest.java:27)
     [exec] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [exec] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     [exec] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     [exec] at java.lang.reflect.Method.invoke(Method.java:324)
     [exec] at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
     [exec] at java.lang.Thread.run(Thread.java:534)