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add this line in your CMakeLists.text set(add_java_source_dir ${PROJECT_SOURCE_DIR}/src)

I tried and followed many docs on internet. Sometimes it gives same error as asked ros answer.Can someone post understandable tuts?

there isn't '<depend package="add" />' line on my manifest.xml

so how to fix this problem?

Can you explain the above first figure "Topic mechanism" please?

thanks guys for comment here is my console error of above client.cpp

/usr/bin/make all 
mkdir -p bin
cd build && cmake -Wdev -DCMAKE_TOOLCHAIN_FILE=`rospack find rosbuild`/rostoolchain.cmake  ..
Re-run cmake no build system arguments
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
[rosbuild] Building package add
Failed to invoke /opt/ros/diamondback/ros/bin/rospack deps-manifests add
-- Configuring incomplete, errors occurred!
[rospack] package [add] depends on itself (/home/f/workspace/add/manifest.xml).
[rospack] self-dependency


CMake Error at /opt/ros/diamondback/ros/core/rosbuild/public.cmake:113 (message):


  Failed to invoke rospack to get compile flags for package 'add'.  Look
  above for errors from rospack itself.  Aborting.  Please fix the broken
  dependency!

Call Stack (most recent call first):
  /opt/ros/diamondback/ros/core/rosbuild/public.cmake:183 (rosbuild_invoke_rospack)
  CMakeLists.txt:12 (rosbuild_init)


make: *** [all] Error 1

Hello there, I have created rospackage "add" and client.cpp file. when I compile the cpp file header file "add/AddTwoInts.h" gives this error.No such file or directory,,, Do you have any idea for this error?

Please describe more detailed in first figure?

Hello there , I am a newbee for ROS. I don't know and I wanna know which of c++ or python is good to start ?

Can you post some very basic tuts who are reading this post and thank you.