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@A.Grag std_msgs.String is a standard message, and you are dealing with service clients in that piece of code.

I suggest you to take a look at https://github.com/rosjava/rosjava_core/tree/kinetic/rosjava_tutorial_pubsub and http://wiki.ros.org/rosjava_build_tools/Tutorials/indigo/WritingPublisherSubscriber%28Java%29 first, I think you are mixing the concepts of messages and topics with services.

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