[jdom-interest] JDOM/Xerces: Thread Safe

New, Cecil (GEAE) cecil.new at ae.ge.com
Fri Oct 31 08:03:51 PST 2003

We have a number of apps that use some common JDOM/Xerces code.  We have
seen periodic failures and our testing points to some sort of
multithreading/concurrency issues.

Weblogic 5.1 on Sun OS
JDK 1.3.0_03
Xerces 1.2.1
JDOM beta8
Using DOM Parser

Some findings might help:
(note:parser instance is different in each thread)

(1) set validation to false ... seems to work fine with threads.  However,
we don't consider this a viable solution or workaround :-)

(2) if each thread parses the same xml ... all threads fail invariably ..
gives a "duplicate element " kind of exception
If i print the Document from memory, sometimes it prints all the files
properly, sometimes more than 1 fail. 

(3) if each thread parses a differnt xml
Seems to pass ... if the xml is small ... fails erratically sometimes with

Thanks for your help!

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