rosjava installation on macosx results in an error

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Following these instructions http://wiki.ros.org/rosjava/Tutorials... , at the step when rosdep install --from-paths src -i -y is executed I get

ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
rosjava_build_tools: No definition of [python-rosinstall-generator] for OS [osx]

This error looks similar to this error.

I checked rosjava_build_tools folder and .rosinstall is missing. I added rosjava_build_tools to ROS_PACKAGE_PATH following the advice given here.

Any help is appreciated.

EDIT: moving to the next step and calling catkin_make does not produce errors.