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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.
567 guys passed the Java kata so I think there is nothing wrong in the tests. Your solution is maybe not perfectly good so sometimes you pass the random tests and sometimes you fail one particular random tests; it depends on the random tests you get... Anyway it is now impossible to re-edit and change the Java kata since more than 500 guys paased it. Cheers.
PS: you can have a look at other solutions:-)