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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.
Java seems fine, but post your code with proper markdown and a spoiler tag, and I'll take a look for you if you want.
you can print them at the beginning of your function, match them to the error messages to debug