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• it doesn't make sense to increase the number of concurrent consumers for a JMS topic. This just leads to concurrent consumption of the same message.
• the concurrentConsumers property and the maxConcurrentConsumers property can be modified at runtime, for example, via JMX.
  For the details you can refer following Bruce Snider's blog: http://bsnyderblog.blogspot.com/2010/05/tuning-jms-message-consumption-in.html^{Image Removed}.

You can see that Spring provides solution for both mentioned scalability aspects. But how we can use it in CXF?

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It is possible to achieve scalability of a CXF client and service using Spring JMS functionality and the CXF JMS Configuration Feature.
It is not necessary to write any line of code, just configure and leverage already existing stuff.
Using this feature can have essential invluence on the performance for some environments: in one Prove Of Concept I have improved CXF service throughput on 360% (from 500 to 1800 msg/sec) just using session pool and multithread JMS consumer!
Reference performance numbers for SOAP over JMS are represented in Christian Schneider's article: http://www.liquid-reality.de/pages/viewpage.action?pageId=5865562^{Image Removed}, so you can easily compare it with own results and make appropriate tunning if necessary.

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