The documentation talks about WrongMethodTypeException in case of mismatched type. It does not mention about reference casting error for return type. JDK fails with ClassCastException for the below code:

import java.lang.invoke.*;
public class code {
public static void main(String[] args) throws Throwable {
System.out.println("Testing ConstantBoostraps.invoke");

                ConstantBootstraps.invoke(MethodHandles.lookup(), null, int.class, MethodHandles.lookup().unreflect(code.class.getDeclaredMethod("worker", int[].class)), new code(), 10, 10);
        }

        public Object worker(int... args) {
               return 0L;
       }

}