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http://jira.codehaus.org/browse/XFIRE-1001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_96792
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Tatu Saloranta commented on XFIRE-1001:
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For what it's worth, Woodstox factories are fully thread-safe in regards to
reader/writer construction methods (as well as wrt. any other interaction
between factory and readers/writers it creates). There is no need for
synchronization; although at the same time, cost of synchronization is rather
small relative to all xml processing. Constructing readers and writers is a
cheap operation.
I think this is true for other Stax implementations as well, although to be
sure you might want to contact Sun sjsxp folks, or check out source code.
The only non-thread-safe part of dealing with factories is configuration:
changing settings via factory.setProperty() is not (guaranteed to be)
thread-safe.
> Concurrency issue in StaxUtils.createXMLStreamReader
> ----------------------------------------------------
>
> Key: XFIRE-1001
> URL: http://jira.codehaus.org/browse/XFIRE-1001
> Project: XFire
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.2.6
> Environment: Windows XP, Java 5 update 9
> Reporter: Walter Seymore
> Assignee: Dan Diephouse
> Attachments: HelloWorldClient.java, HelloWorldService.java
>
>
> I've created a simple HelloWorld service that echoes a name back to the
> client. This works fine until i create 2 or more threads that calls the
> service at the same time. Every now and then, I get an XML parsing error. The
> content of the request is always correct however and making this small change
> to StaxUtils fixes the issue.
> 759 synchronized(factory) {
> 760 return factory.createXMLStreamReader(in, encoding);
> 761 }
> So this would indicate that it is not safe to use the same XMLInputFactory
> instance in a multi-threaded way. Obviously synchronisation is not an optimal
> solution, but hopefully you guys can think of something better :).
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