[jdom-interest] JDOM/Xerces: Thread Safe

[Bradley S. Huffman]

JDOM is not thread safe, neither is Xerces :(

Brad

"New, Cecil (GEAE)" writes:

> 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.
> 
> Setup:
> 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
> NullPointerException.
> 
> Thanks for your help!
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