THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Then it means that you did not define a transaction context manager in your xml configuration.
Fix
Open http://svn.apache.org/repos/asf/incubator/servicemix/trunk/servicemix-assembly/src/main/release/conf/servicemix.xml and copy/paste the transactionContextManager bean definition. You have to use a recent version of 3.0-SNAPSHOT.