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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
This kata is perfectly solvable in Java, or at least I had no problem with it. I am closing the issue as invalid.
Maybe this FAQ would be helpful, or just tell us what exactly is your problem?