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A workaround if you are having problems with ROSJava messages and rosbag, Is to write an efficient cpp node that subscribes to the ROSJava messages you want to store and republishes on topics to rosbag using a roscpp publisher. I had been getting similar errors using Rosbag to subscribe to ROSJava messages. This allowed me to save my ROSJAVA message traffic in a bag file.

Hope this helps

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