serialization performance improvements..

[omatzura]

Hi all!

I've been doing some performance tests on jbossws and have had some problems with the built in ElementSerializer which is used when creating "nodatabinding" web-services which return SOAPElements from webservice methods (we do all xml-data-binding with xmlbeans).

The ElementSerializer uses the writeDOMElement in SerializationContext(Impl) to write the SOAPElement to the response stream. Benchmarking the writeDOMElement method shows that is it extremely slow when compared to standard xml-serialization with the xerces-j XMLSerializer (a factor of 10!)..

Based on these findings I replaced the call to writeDOMElement in the ElementSerializer with serialization using a pool of xerces-j XMLSerializers and writing the serialized result with SerializationContext.writeString. This has has substantially increased overall performance of our services (factor of 2-3), especially for large messages (factor of 5-6). All jboss-webservice tests passed ok.

Performing the same initial tests on the 4.0.2 sources show that these are still 3-4 times slower than our solution, but I haven't tested replacing the 4.0.2 ElementSerializer in a deployed environment.

so now I wonder why this is the case :-) Does writeDOMElement do anything that the XMLSerializer can/will not? Will future versions address this issue? How can I help?

regards!

/Ole

[thomas.diesler]

Ole,

thanks for this work. Are you interested in applying your findings to the new jbossws stack? Resources are best spent there, as we have already put the Axis based stack into maintenance.

[omatzura]

Thomas,

I'll could definetly give it a try.. where do I start? How/where do I get the "new" jbossws stack?

regards!

/Ole

[thomas.diesler]

cvs co jboss-head
cd /jboss-head/webservice
ant deploy-jbossws
cd /jboss-head/webservice/test
ant tests

Development is test driven, we have zero tollerance policy on test failures. Development issues are beeing discussed here

http://www.jboss.org/index.html?module=bb&op=viewforum&f=174

good luck

[gwright00]

I am trying to use the same technique (doc/literal, nodatabinding, and
xmlbeans for java binding, jboss 4.0.2, ejb endpoint). After I add my
xmlbean generated document to the SOAPBodyElement using
addDocument(); the Axis runtime throws a NAMESPACE_ERR.

I would very much love to see a complete working example.

[omatzura]

Hi

there were some errors in the addDocument method in jboss 4.0.1 so we created our own method to convert the dom node returned by XmlObject.getDomNode() to a SOAPElement..

regards!

/Ole