But can someone in basic terms explain where there may be a threading issue? We use dom4j as part of a fully threaded server and I'd like to know if there is anything I need to look out for.
In many cases I use a shared dom4j document that many threads can read, but modification of course is done through proper synchronization in my own code. Is this enough? I think I'm hearing that it isn't.
Thanks!
Brain, Jim wrote:
I also echo a need to resolve this. We are currently having this issue in
production on a mission critical (probably everyone says that, but it is an
app entry system for an insurance carrier, so I hope that qualifies)
application running on IBM OS/390 (ye old mainframe). Before I pull the
HashTable version, I'd like to hear what the longer term plans are, since
there is a considerable ramp time on getting new cuts of code through our
integration management process.
Jim
Jim Brain, [EMAIL PROTECTED]
"Researching tomorrow's decisions today."
(319) 369-2070 (work)
SYSTEMS ARCHITECT, ITS, AEGON FINANCIAL PARTNERS
-----Original Message-----
From: David D. Lucas [mailto:ddlucas@;lse.com] Sent: Tuesday, October 22, 2002 9:34 AM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Cc: Brain, Jim
Subject: Thread Safety
Sorry for the cross post, but I have not seen any feedback on the thread safety issues. I have taken the stock CVS and changed all the HashMaps to Hashtables to get things to work in our server environment.
I would like to know what the long term direction is for thread safety and if anyone would like my changes?
Basically I took all the classes in org.dom4j.* and org.dom4j.tree.* and changed them to use Hashtable. The methods out there with synchronization are probably no longer needed now that we have a Hashtable. I am looking at an alternative approach to keep the HashMap and performance without having thread related failures.
All this came from the QNameCache getting corrupted when two threads hit it at the same time. It appears that one did a put while another did a get and resulted in a null coming back.
Please let me know what I should do next with the code. If you want I can post it or check it in (given access to development CVS).
Thanks in advance,
Dave
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