java.lang.NullPointerException
   at sun.rmi.transport.DGCClient$EndpointEntry.removeRefEntry(DGCClient.java:333)
   at sun.rmi.transport.DGCClient$EndpointEntry.processPhantomRefs(DGCClient.java:615)
   at sun.rmi.transport.DGCClient$EndpointEntry.access$1400(DGCClient.java:171)
   at sun.rmi.transport.DGCClient$EndpointEntry$RenewCleanThread.run(DGCClient.java:556)
   at java.lang.Thread.run(Thread.java:722)