I installed ROS on Raspberry Pi 3. http://wiki.ros.org/rosjava/Tutorials/kinetic/Source%20Installation I did this tutorial [3.1]. When I do [catkinmake],

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Note: /home/ubuntu/rosjava/src/rosjavabootstrap/messagegeneration/src/main/java/org/ros/internal/message/MessageImpl.java uses or overrides a deprecated API.
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Note: Some input files use unchecked or unsafe operations.
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[ 98%] Built target gradle-rosjavacore
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[100%] Built target rosjavamessagesgenerateartifacts

What I should do to solve this warning?