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You have Java 8 u201, which should work fine, however you have also got JDK 11, which will be the default Java used, Forge is not compatible with Java 11 so you should uninstall it, if you need the JDK for writing mods then you should install JDK 8

It usually means your signature doesn't match with the function you are overriding. As a result your function doesn't get called at all. Also i think your return value should be FAILED or SUCCESS. I am not sure at the moment, look at what the parents function does.