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What you have to do is the following steps.

1. Take the original C++ code.
2. Use the documentation to see which packages/modules hold your functionality.
3. Surft to the java documentation and hope that the corresponding C++ functions has been ported to Java and has a working wrapper.

There is indeed no large base of java examples provided with openCV. However, if you succeed in creating basic samples, you can upload them with a pull request to the source code. Look at the how to contribute page.