Concurrency issue in StaxUtils.createXMLStreamReader

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)

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 .