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-- building orxJava.jar
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To do that, use eclipse. The file .project is an eclipse project. You can import this project into your eclipse workspace.

Sources of orxJava.jar are in the code/build/android/orxJavaLib. 

You can ignore all of errors eclipse shows and just right click the org.orxproject.lib package, export it as a normal jar named orxJava.jar.

You can also just drag the org.orxproject.lib package into your project and no more orxJava.jar is needed. It may be more easier to understand what the java part do and debug without difficulty.