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Try running the tutorial using

./build/install/rosjava_tutorial_pubsub/bin/rosjava_tutorial_pubsub org.ros.rosjava_tutorial_pubsub.Talker

The path you are using looks like it might come from an old tutorial.

A lot of the documentation on the internet is old, so be sure to check the date when you read things. This is the best source of documentation at the moment: http://docs.rosjava.googlecode.com/hg/rosjava_core/html/index.html .