A stack trace perhaps?
----- Original Message ----
From: Johnny Tolliver <jxt_at_ornl.gov>
To: users_at_jaxb.dev.java.net
Sent: Thursday, January 24, 2008 12:57:34 PM
Subject: AIOOB Exception during marshal after months of running
I have a hard-to-diagnose problem. I have a web app that uses JPA and
JAXB
as standalone components -- i.e., not part of EJB. The app is running
at a
customer site on Tomcat 5.5.23 and Java 6u1 on Windows Server 2003.
After over a month of successful running, suddenly an
ArrayIndexOutOfBoundsException began occurring during a call to
Marshaller.marshal(). Obviously, something that I'm passing to
marshal()
must be somehow corrupted, but it's not at all clear what or how. This
section of code has been hit thousands of times without errors. The
customer
claims that no changes have been made anywhere (heard that before? :-)
Once the AIOOBE started happening, it continued to happen each time
through
this section of code -- each time that a client hit the server in a way
that
exercised the problem code, which is hundreds or thousands of times a
day.
Not surprisingly, I'm unable to reproduce the customer conditions and
see
the error on my development network.
One more thing. Restarting the server fixes the problem. No other
changes.
Just restart Tomcat and wait for the clients to hit the server, which
will
happen almost instantly, and all is well.
The JAXB version in use would be whatever shipped with Java 6u1.
Any ideas what could be wrong or how to diagnose it? I could obviously
more
heavily instrument the code around the problem area, but I might have
to
wait another month to see any data. And who's to say it will happen
again in
one more month? Could be sooner. Could be longer. It doesn't look like
a
thread collision issue that finally showed up under heavy load, but I
guess
anything is possible. I have been cognizant of thread safety during
development of the server, but that's not to say I made no errors.
Thanks for any ideas.
Johnny S. Tolliver
Oak Ridge National Laboratory
tolliverjs_at_ornl.gov, 865-574-1305
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