ParentLastURLClassLoader.java revision 2610:d4c30fc77c75 
1/*
2 * Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24package jdk.test.lib.classloader;
25
26import java.net.URL;
27import java.net.URLClassLoader;
28
29/**
30 * An url classloader, which trying to load class from provided URL[] first,
31 * and using parent classloader in case it failed
32 */
33public class ParentLastURLClassLoader extends URLClassLoader {
34
35    public ParentLastURLClassLoader(URL urls[], ClassLoader parent) {
36        super(urls, parent);
37    }
38
39    @Override
40    public Class<?> loadClass(String name) throws ClassNotFoundException {
41        try {
42            Class<?> c = findClass(name);
43            if (c != null) {
44                return c;
45            }
46        } catch (ClassNotFoundException e) {
47            // ignore
48        }
49        return super.loadClass(name);
50    }
51}
52