1 /*
2  * Copyright (c) 2018, 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 
24 package test;
25 
26 import java.util.*;
27 import java.io.*;
28 
29 public class IAE_Loader1 extends ClassLoader {
30 
31     private final Set<String> names = new HashSet<>();
32 
IAE_Loader1(String name, String[] names)33     public IAE_Loader1(String name, String[] names) {
34         super(name, ClassLoader.getSystemClassLoader());
35         for (String n : names) this.names.add(n);
36     }
37 
loadClass(String name, boolean resolve)38     protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
39         if (!names.contains(name)) {
40             return super.loadClass(name, resolve);
41         }
42         String filename = name.replace('.', '/') + ".class";
43         Class<?> result = null;
44         try (InputStream data = getResourceAsStream(filename)) {
45             if (data == null) {
46                 throw new ClassNotFoundException();
47             }
48             try (ByteArrayOutputStream buffer = new ByteArrayOutputStream()) {
49                 byte[] bytes = data.readAllBytes();
50                 result = defineClass(name, bytes, 0, bytes.length);
51             }
52         } catch (IOException e) {
53             throw new ClassNotFoundException("Error reading class file", e);
54         }
55         if (resolve) resolveClass(result);
56         return result;
57     }
58 
59 }
60