looks like u solved it

Should be fixed now, please inform me in case I missed anything

Fixed

[Java] Initial solution does not compile, even after adding return 0 in the method body. Perhaps the method signature is wrong?

For an 8 kyu Kata not focused on debugging, the initial solution should compile; hence this is an Issue.

Please don't post solutions in Discourse.

I believe I fixed it. Please re-raise if the issue still persists.

• Node 12 should be enabled (Refer this and this for more info)

• JS nested it blocks should be removed

Firstly, please use the spoiler flag when you post code in the discourse, even if your solution is wrong.

As for your code: are you supposed to return -1 if a is less than b or is there another condition that needs to be checked first? If I run your code with the following [a,b] values, it will always return -1, regardless of any margin:
[1,2], [1,100], [5,6], [5,7], [5,8]. Can you see why?