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1) The matter is that "std_msgs/Bool" is an identifier for msg and not srv. I generate a custom srv and replace by "my_custom_service._TYPE"

2) rosjava won't generate a new .jar file for msg & srv if one exist already : you have to delete the whole folder "build" each time you want to add a new message or service. I followed this way to generate new msg/srv Unofficial Messages

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