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You receive this error as the gradle wrapper is not present in your copy of rosjava_core. I think a number of major changes have been made to rosjava_core since the release of that deb. You should download and install rosjava_core from source as per the new installation instructions here: http://docs.rosjava.googlecode.com/hg/rosjava_core/html/installing.html

Note that these instructions use rosws/rosinstall, and you'll have to place your example package in the same workspace to get it to work.