How to generate java wrapper for my C++ using gen_java.py?

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I am trying to generate java wrapper for my c++ code using the default opencv java wrapper mechanism.

I found the "gen_java.py" file from the location: opencv-3.0.0-beta/modules/java/generator

Then ,try to give the input's to the gen_java.py ,Facing issues in conversion.

Any one can Provide a steps to do the conversion.Thanks in advance