jdk-24/test/hotspot/jtreg/runtime/Nestmates/privateStaticMethods/TestJNI.java

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/*
 * @test
 * @bug 8046171
 * @summary Test JNI access to private methods between nestmates and nest-host
 *          using different flavours of named nested types
 * @compile ../NestmatesJNI.java
 * @run main/othervm/native TestJNI
 * @run main/othervm/native -Xcheck:jni TestJNI
 */
public class TestJNI {

    // Unlike reflection, the calling context is not relevant to JNI
    // calls, but we keep the same structure as the reflection tests.

    // Private static method of nest-host for nestmates to access
    private static void priv_static_invoke() {
        System.out.println("TestJNI::priv_static_invoke");
    }

    static final String METHOD = "priv_static_invoke";

    // public constructor so we aren't relying on private access
    public TestJNI() {}

    // Methods that will access private static methods of nestmates
    // We use the arguments for overloading purposes and use the fact
    // you can invoke a static method through an object reference for
    // convenience. Except for static interface methods of course.

    // NOTE: No InnerNested calls in this test because non-static nested types
    // can't have static method

    void access_priv(TestJNI o) {
        doCall(o.getClass(), METHOD);
    }
    void access_priv(StaticNested o) {
        doCall(o.getClass(), METHOD);
    }
    void access_priv(StaticIface o) {
        // Can't use o.getClass() as the method is not in that class
        doCall(StaticIface.class, METHOD);
    }

    // The various nestmates

    static interface StaticIface {

        private static void priv_static_invoke() {
            System.out.println("StaticIface::priv_static_invoke");
        }

        // Methods that will access private static methods of nestmates

        default void access_priv(TestJNI o) {
            doCall(o.getClass(), METHOD);
        }
        default void access_priv(StaticNested o) {
            doCall(o.getClass(), METHOD);
        }
        default void access_priv(StaticIface o) {
            // Can't use o.getClass() as the method is not in that class
            doCall(StaticIface.class, METHOD);
        }
    }

    static class StaticNested {

        private static void priv_static_invoke() {
            System.out.println("StaticNested::priv_static_invoke");
        }

        // public constructor so we aren't relying on private access
        public StaticNested() {}

        // Methods that will access private static methods of nestmates

        void access_priv(TestJNI o) {
            doCall(o.getClass(), METHOD);
        }
        void access_priv(StaticNested o) {
            doCall(o.getClass(), METHOD);
        }
        void access_priv(StaticIface o) {
            // Can't use o.getClass() as the method is not in that class
            doCall(StaticIface.class, METHOD);
        }
    }

    class InnerNested {

        // public constructor so we aren't relying on private access
        public InnerNested() {}

        void access_priv(TestJNI o) {
            doCall(o.getClass(), METHOD);
        }
        void access_priv(StaticNested o) {
            doCall(o.getClass(), METHOD);
        }
        void access_priv(StaticIface o) {
            // Can't use o.getClass() as the method is not in that class
            doCall(StaticIface.class, METHOD);
        }
    }

    public static void main(String[] args) {
        TestJNI o = new TestJNI();
        StaticNested s = new StaticNested();
        InnerNested i = o.new InnerNested();
        StaticIface intf = new StaticIface() {};

        o.access_priv(new TestJNI());
        o.access_priv(s);
        o.access_priv(intf);

        s.access_priv(o);
        s.access_priv(new StaticNested());
        s.access_priv(intf);

        i.access_priv(o);
        i.access_priv(s);
        i.access_priv(intf);

        intf.access_priv(o);
        intf.access_priv(s);
        intf.access_priv(new StaticIface(){});
    }

    static void doCall(Class<?> klass, String method) {
        String definingClass = klass.getName();
        String desc = "Static invocation of " + definingClass + "." + method;
        try {
            NestmatesJNI.callStaticVoidVoid(definingClass, method);
            System.out.println(desc + " - passed");
        }
        catch (Throwable t) {
            throw new Error(desc + ": Unexpected exception: " + t, t);
        }
    }
}