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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.
Resolving unhelpful issues
There is a 10s limit on java katas to test for performance.
Since calculating factorial is not particularly time consuming, I guess your code contains infinite recursion or an infinite loop.