Deadlock in RMIConnector.close

The locking protocol used in javax.management.remote.rmi.RMIConnector is susceptible to deadlock. The particular deadlock observed is this:

"ClientNotifForwarder-6":
        at javax.management.remote.rmi.RMIConnector.close(RMIConnector.java:407)
        - waiting to lock <0xf102ceb8> (a javax.management.remote.rmi.RMIConnector)
        at javax.management.remote.rmi.RMIConnector$RMIClientCommunicatorAdmin.gotIOException(RMIConnector.java:1442)
        - locked <0xf0f22ac0> (a [I)
        at javax.management.remote.rmi.RMIConnector$RMINotifClient.fetchNotifs(RMIConnector.java:1294)
        at com.sun.jmx.remote.internal.ClientNotifForwarder$NotifFetcher.fetchNotifs(ClientNotifForwarder.java:508)
        at com.sun.jmx.remote.internal.ClientNotifForwarder$NotifFetcher.run(ClientNotifForwarder.java:399)
        at com.sun.jmx.remote.internal.ClientNotifForwarder$LinearExecutor$1.run(ClientNotifForwarder.java:83)
"main":
        at javax.management.remote.rmi.RMIConnector.close(RMIConnector.java:412)
        - waiting to lock <0xf0f22ac0> (a [I)
        - locked <0xf102ceb8> (a javax.management.remote.rmi.RMIConnector)
        at Client2.closeConnectors2(Client2.java:45)
        at Client2.main(Client2.java:171)

RMIConnector.close() is synchronized and contains a block "synchronized(terminationLock)". When it is called by user code it therefore takes the locks in the order RMIConnector.this->terminationLock. On the other hand, RMIConnector.RMIClientCommunicatorAdmin.gotIOException calls RMIConnector.close() from with a "synchronized(terminationLock)" block. So it takes the locks in the order terminationLock->RMIConnector.this[->terminationLock]. This can lead to deadlock as has been observed by the customer.
###@###.### 2005-07-13 14:39:20 GMT