Fun with raw types

Test.java

package test;

import java.util.Optional;

public class Test {
    
    interface GenericInterface<T> {

        Optional<String> methodReturningOptionalOfString();
    }

    String does_not_compile_with_javac_but_eclipse(GenericInterface rawReference) {
        return Optional.of("asdasd")
                .or(() -> rawReference.methodReturningOptionalOfString())
                .orElse(null);
    }
    
    String does_not_compile_with_eclipse(GenericInterface rawReference) {
        return rawReference.methodReturningOptionalOfString().orElse(null);
    }

    String does_compile(GenericInterface rawReference) {
        return Optional.of("asdasd")
                .or(() -> (Optional<String>) rawReference.methodReturningOptionalOfString())
                .orElse(null);
    }

}