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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.
The intended solution of the kata is a CVE: https://security-explorations.com/materials/SE-2012-01-ORACLE-11.pdf (Issue 57 and 58) which has already been patched in Java 17. It will never work in the future.
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SecurityManagerhas already been disallowed by default since Java 18, and next LTS after Java 17, Java 21, will be released a few days later at 19th September. This kata will be broken as this happens.