Do you need java.lang.Object and java.lang.String to work properly? Do you need Java interfaces and 'instanceof' to even work? We're not talking about 100% JLS

Do you need java.lang.Object and java.lang.String to work properly? Do you need Java interfaces and 'instanceof' to even work? We're not talking about 100% JLS semantics, but if you can't even compile code that utilizes java.lang.* and java.util.*, why not just use Kotlin, Dart, Typescript, and other languages provide high level typed JS like languages. Using a language that doesn't compile properly leads to all kinds of nasty surprises and hard to diagnose bugs.