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Hi @hamada! First of all, take a look into https://wiki.ros.org/rosjava; that's the entry point for the most up-to-date tutorials (see Kinetic version).

Regarding this question in particular, I see two different issues: - AddTwoInts is a service; take a look around here for reference: http://wiki.ros.org/rosjava_build_tools/Tutorials/indigo/UsingServices. - About the parameter server, you can check this link for reference: http://library.isr.ist.utl.pt/docs/roswiki/rosjava(2f)Overview(2f)Parameters.html. The API hasn't changed since then.