POA.destroy(true, true) throwing NPE

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###@###.### 2002-04-11

build : Hopper preint Apr9

Problem description:

If a servant is executing an operation(long delay) and multiple threads try to invoke POA.destroy(true, true) on the POA that the servant is associated with, NPE is thrown.
java.lang.NullPointerException
        at com.sun.corba.se.internal.POA.POAImpl.etherealizeAll(POAImpl.java:494
)
        at com.sun.corba.se.internal.POA.POAImpl$1$DestroyThread.performDestroy(
POAImpl.java:650)
        at com.sun.corba.se.internal.POA.POAImpl.destroyInternal(POAImpl.java:66
5)
        at com.sun.corba.se.internal.POA.POAImpl.destroy(POAImpl.java:590)
        at test.DestroyThread.run(Server.java:43)

Run attched test to reproduce problem.

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