I rejected the translation, so it won't be accepted by some careless approver without checking it properly. See translation comments to see why I decided to reject it, and fork it or create new one if you want to fix it.

• If you really decide to translate this kata into a language with bigint support (not sure if it is a good idea tho), then, for 4 kyu kata, I'd expect BigInteger to be disabled,
• Random tests do not generate big integers. Contrary, they generate only small integers.
• No tests for edge cases: leading zeros, overflow on most significant digit, some extreme cases of overflow (like 9999999 + 1)

Going to reject the translation because someone is going to approve it without checking. It can always be forked if anyone wants to fix it, but I am not sure if it's good idea to translate this kata into a language with big integer support without disabling it.

java translation added, please approve :)

Maybe add some more info in the description, so it is clear you need to look at the tests to get started.