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The post above was confused by http://answers.ros.org/question/10276/rosjavapure-pubsub-tutorial/ which probably refers to an older version where this was possible.

The getting started guide of rosjava here: http://docs.rosjava.googlecode.com/hg/rosjava_core/html/getting_started.html#messages

explains how to instantiate messages using a factory. All messages are interfaces on purpose.

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