I concur with Chuck - this is always a deadlock in my experience --
places to look:
Exceptions in direct actions which access the session ( this is a WO
bug which I think has been fixed, but I don't know when/where ).
Passing EO's across thread boundaries ( Check all your background
thread processes. Any editing contexts used need to be created
within the thread. Don't even try local instance of object in the
thread -- pass in an OID and fetch it)
EC locking and unlocking failing -- always unlock in a 'finally' block.
Recursive session access in any application ( i.e. -- a request which
makes an http request to same app with the same session will always
deadlock. If you have single-threaded app, any request to the same
app will deadlock ).
It's also possible to see this in a single threaded app with very
slow response times for certain actions, but IME it's usually a
deadlock.
Best,
Andrew
On Jul 29, 2008, at 9:38 AM, Chuck Hill wrote:
On Jul 29, 2008, at 5:14 AM, Bob Stuart wrote:
Hi All,
I Know I need to update some of this but it had been running fine
for quite a while.
WebObjects 5.3.3
OS X 10.4.11
Java 1.5.0_13-b05-241
WONDER 3 from a March-03-2007 Daily build
Frontbase 4.2.7
"All of a sudden" The application is hanging often. No good idea
why. Running ~10 instances of the the same code base with
different launch params to connect to different client DB's
Many of the instances for will hang. The DB seems fine and we
don't see all the instances for any DB fail at once. If no one
hits the app they seem to stay fine such as over the weekend.
Otherwise they seem to die at least once a day. The more heavily
used die more often but the very lightly used die also.
I did a netstat and found many CLOSE_WAIT when the instances were
hung but don't know if that is relevant.
My initial guess is that this is just a symptom of the problem.
We did deploy new features recently but no "major" type changes.
Ideas? Suggestions?
The symptoms sound like deadlock to me. It does not take a major
change to cause this. You will need a thread dump to diagnose
further. You can find instructions here: http://
www.gvcsitemaker.com/gvc.webobjects/faq&mode=single&recordID=41413
Chuck
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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