Re: DGCClient$EndpointEntry stuck

Having discovered what the problem was, I thought I'd add some explanation
to help anyone searching the list archives later.

At the start of the problem scenario, the RMI Client is correctly making
calls to the RMI Server, also sending DGC messages.  Then the RMI Server
is rebooted (not unusual for this application because the RMI Server is
actually a client's workstation; the RMI Client is the central database
machine which periodically connects to the workstations to pull
information up).  After the reboot, the RMI Server uses a different port
number to expose its objects (of course the RMI Registry port is always
the same) but some other application uses the old port number for a
different purpose.  All fine so far, but the RMI Client machine is still
sending occasional DGC messages to the old port number, and it confuses
the DGC code, often causing large quantities of socket connections to be
made in rapid succession (depending on what the other app does with the
socket when it gets the DGC info).  What made the problem worse for me is
that I enclose the Socket object in a wrapper so I can track sockets and
do other stuff.  Because the DGC code does not always call .close() on the
socket when it doesn't understand the response, this left lots of sockets
open as far as the socket counting code was concerned.  A finalizer soon
sorted this out.

The solution to the cascade of socket creation is to ensure that RMI
objects are always published on the same port numbers so that after the re-
start, the DGC messages for the old objects will be correctly handled by
the newly rebooted RMI Server JVM.

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