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I don't see many printlns for debugging in that code. How are you debugging it?

There are 76 source files in that zip. What do you expect anyone to do with all that code?

Can you provide a small program that compiles and executes to demonstrate your problem?
Your posted code is incomplete and uses 3rd party classes.

Can you use what the method returns to tell the caller that the goal has been found and to stop further searching and to return that results to its caller?