FinalVirtualCallFromInterface.java

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/**
 * @test
 * @bug 8200167 8010319
 * @summary Regression test for a bug introduced in 8200167 and fixed in 8010319
 * @run main FinalVirtualCallFromInterface
 */

import java.lang.invoke.*;

/*
 * Test that a MethodHandle for a final method, called from an interface, works correctly.
 * With only 8200167 applied this fails with:
 * Exception in thread "main" java.lang.InternalError: Should only be invoked on a subclass
 *        at
 * java.base/java.lang.invoke.DirectMethodHandle.checkReceiver(DirectMethodHandle.java:441)
 *
 * The nestmate update under 8010319 fixes that bug.
 */
public class FinalVirtualCallFromInterface {

    static class Final {
        public final void fm() {}
    }

    static interface FinalUser {
        static void test() throws Throwable {
            MethodType mt = MethodType.methodType(void.class);
            MethodHandle mh = MethodHandles.lookup().findVirtual(Final.class, "fm", mt);
            Final f = new Final();
            mh.invokeExact(f);
            mh.invoke(f);
        }
    }

    public static void main(String[] args) throws Throwable {
        FinalUser.test();
    }
}