UninitializedParent.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * 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
 * accompanied this code).
 *
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 * 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
 * @bug 6636650
 * @summary Uninitialized class loaders should not be a parent of other
 *          class loaders.
 * @run main/othervm UninitializedParent
 */


import java.net.*;

public class UninitializedParent {
    private static ClassLoader loader;
    public static void main(String[] args) throws Exception {
        System.setSecurityManager(new SecurityManager());

        // Create an uninitialized class loader
        try {
            new ClassLoader(null) {
                @Override
                protected void finalize() {
                    loader = this;
                }
            };
        } catch (SecurityException exc) {
            // Expected
        }
        System.gc();
        System.runFinalization();

        // if 'loader' isn't null, need to ensure that it can't be used as
        // parent
        if (loader != null) {
            try {
                // Create a class loader with 'loader' being the parent
                URLClassLoader child = URLClassLoader.newInstance
                    (new URL[0], loader);
                throw new RuntimeException("Test Failed!");
            } catch (SecurityException se) {
                System.out.println("Test Passed: Exception thrown");
            }
        } else {
            System.out.println("Test Passed: Loader is null");
        }
    }
}