From RMI-USERS list:

We are running into an intermittent problem with an RMI client application.
About 20% of the time, when making remote calls, we get the following
exception.


  *** Security Exception: threadgroup ***
  java.rmi.RMISecurityException: security.threadgroup
        at
  java.rmi.RMISecurityManager.checkAccess(RMISecurityManager.java:92)
        at java.lang.ThreadGroup.checkAccess(ThreadGroup.java)
        at java.lang.Thread.init(Thread.java)
        at java.lang.Thread.<init>(Thread.java)
        at sun.rmi.transport.RMIThread.newThread(RMIThread.java:45)
        at sun.rmi.transport.tcp.TCPChannel.free(TCPChannel.java:222)
        at sun.rmi.server.UnicastRef.done(UnicastRef.java:153)
        at Server_Stub.getRecord(Server_Stub.java:136)
        at Eml.openRecord(Eml.java:369)
        at Eml.openOtherRecord(Eml.java:348)
        at EmlWidget.actionPerformed(Eml.java:686)
                     :
                     :
                     :

It looks as if the stub class is calling something that leads to an attempt
to create a thread. The RMISecurityManager does not allow downloaded code
to manipulate threads, so this causes an exception to be thrown. So the
question is why is a stub trying to create a thread when this is guaranteed
to throw an exception? Also, why is the problem intermittent?

This is occurring on Solaris 2.6 with JDK 1.1.6. I was unable to duplicate
the problem using JDK 1.1.5.