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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 is also an answer: [559756, 893250]
You could have seen at the top of the page that more than 600 guys passed the Java kata so if there were errors somebody would already have seen them. In that case don't post an issue...
Your answer is incomplete hence you don't pass the test.