test/jdk/java/lang/reflect/AccessibleObject/CanAccessTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
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 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/**
 * @test
 * @build CanAccessTest
 * @modules java.base/jdk.internal.misc:+open
 * @run testng/othervm --illegal-access=deny CanAccessTest
 * @summary Test AccessibleObject::canAccess method
 */

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.security.SecureClassLoader;

import jdk.internal.misc.Unsafe;
import org.testng.annotations.Test;
import static org.testng.Assert.*;

@Test
public class CanAccessTest {
    private static Unsafe INSTANCE = Unsafe.getUnsafe();

    /**
     * null object parameter for Constructor
     */
    public void testConstructor() throws Exception {
        Constructor<?> ctor = Unsafe.class.getDeclaredConstructor();
        assertFalse(ctor.canAccess(null));
        assertTrue(ctor.trySetAccessible());

        try {
            // non-null object parameter
            ctor.canAccess(INSTANCE);
            assertTrue(false);
        } catch (IllegalArgumentException expected) {}
    }

    /**
     * Test protected constructors
     */
    public void testProtectedConstructor() throws Exception {
        TestLoader.testProtectedConstructorNonOpenedPackage();

        Constructor<?> ctor = TestLoader.class.getDeclaredConstructor();
        assertTrue(ctor.canAccess(null));
    }

    /**
     * null object parameter  for static members
     */
    public void testStaticMember() throws Exception {
        Method m = Unsafe.class.getDeclaredMethod("throwIllegalAccessError");
        assertFalse(m.canAccess(null));
        assertTrue(m.trySetAccessible());

        try {
            // non-null object parameter
            m.canAccess(INSTANCE);
            assertTrue(false);
        } catch (IllegalArgumentException expected) { }
    }

    /**
     * Test protected static
     */
    public void testProtectedStatic() throws Exception {
        Method m = TestLoader.testProtectedStatic();
        assertFalse(m.canAccess(null));
    }

    /**
     * the specified object must be an instance of the declaring class
     * for instance members
     */
    public void testInstanceMethod() throws Exception {
        Method m = Unsafe.class.getDeclaredMethod("addressSize0");
        assertFalse(m.canAccess(INSTANCE));

        try {
            m.canAccess(null);
            assertTrue(false);
        } catch (IllegalArgumentException expected) { }
    }

    /**
     * the specified object must be an instance of the declaring class
     * for instance members
     */
    public void testInvalidInstanceObject() throws Exception {
        Class<?> clazz = Class.forName("sun.security.x509.X500Name");
        Method m = clazz.getDeclaredMethod("size");

        try {
            m.canAccess(INSTANCE);
            assertTrue(false);
        } catch (IllegalArgumentException expected) { }
    }


    static class TestLoader extends SecureClassLoader {
        public static Method testProtectedStatic() throws Exception {
            Method m = ClassLoader.class.getDeclaredMethod("registerAsParallelCapable");
            assertTrue(m.canAccess(null));
            return m;
        }

        protected TestLoader() throws Exception {
            Constructor<?> ctor = SecureClassLoader.class.getDeclaredConstructor();
            assertFalse(ctor.canAccess(null));
            assertFalse(ctor.trySetAccessible());
        }

        public static void testProtectedConstructorNonOpenedPackage() throws Exception {
            new TestLoader();
        }
    }
}