In compose method of org.switchyard.component.jca.composer.JMSMessageComposer there is handling of different message types (done based on https://issues.jboss.org/browse/SWITCHYARD-934).
In decompose method there is only one way of creating message and it has to be object message.
It is not possible to create another type of message for example TextMessage. In combination with bug https://issues.jboss.org/browse/SWITCHYARD-1396 it is not possible to send other types of JMS via JCA
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