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products/sources/formale Sprachen/Java/Openjdk/test/jdk/java/net/URL/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 2 kB

Quelle HandlerLoop.java Sprache: JAVA

/*
* Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* 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).
*
* 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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;

/*
* @test
* @bug 4135031
* @summary Test bootstrap problem when a URLStreamHandlerFactory is loaded
*          by the application class loader.
* @modules java.base/sun.net.www.protocol.file
* @run main/othervm HandlerLoop
*/
public class HandlerLoop {

    public static void main(String args[]) throws Exception {
        URL.setURLStreamHandlerFactory(
            new HandlerFactory("sun.net.www.protocol"));
        URL url = new URL("file:///bogus/index.html");
        System.out.println("url = " + url);
        url.openConnection();
    }

    private static class HandlerFactory implements URLStreamHandlerFactory {
        private String pkg;

        HandlerFactory(String pkg) {
            this.pkg = pkg;
        }

        public URLStreamHandler createURLStreamHandler(String protocol) {
            String name = pkg + "." + protocol + ".Handler";
            System.out.println("Loading handler class: " + name);
            // Loading this dummy class demonstrates the bootstrap
            // problem as the stream handler factory will be reentered
            // over and over again if the application class loader
            // shares the same stream handler factory.
            new Dummy();
            try {
                Class<?> c = Class.forName(name);
                return (URLStreamHandler)c.getDeclaredConstructor().newInstance();
            } catch (ClassNotFoundException |
                    IllegalAccessException |
                    InstantiationException |
                    NoSuchMethodException |
                    InvocationTargetException e) {
                e.printStackTrace();
            }
            return null;
        }
    }

    private static class Dummy {
    }
}

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