Apache ActiveMQ 5.3.0 has an official SPECjms2007® result, thanks to some great work by Kai Sachs from the Databases and Distributed Systems Group at the Technical University Darmstadt in Germany. Complete details can be found in the official results submission that is linked from the announcement.
Needless to say, 5.3.0 does nicely in both horizontal (number of destinations) and vertical (load per destination) scalability.
It is fitting to see Apache ActiveMQ being used in the world's first SPECjms2007 submission.

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