1 /* 2 * Copyright (c) 2013, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.test.lib.jfr; 27 28 import java.io.DataInputStream; 29 import java.io.IOException; 30 import java.io.InputStream; 31 32 /** 33 * Custom class loader which will try to load the class via getResourceAsStream(). 34 * If there are any errors, the parent class loader will be used instead. 35 */ 36 public class TestClassLoader extends ClassLoader { 37 static public final String CLASS_LOADER_NAME = "jdk/test/lib/jfr/TestClassLoader";// XXX since JDK 9 "JFR TestClassLoader"; 38 39 public TestClassLoader() { 40 //super(CLASS_LOADER_NAME, ClassLoader.getSystemClassLoader()); 41 super(ClassLoader.getSystemClassLoader()); 42 } 43 44 public Class<?> loadClass(String name) throws ClassNotFoundException { 45 46 InputStream is = null; 47 DataInputStream dis = null; 48 try { 49 String resourceName = name.replace('.', '/') + ".class"; 50 is = getResourceAsStream(resourceName); 51 if (is != null) { 52 int i = is.available(); 53 byte buf[] = new byte[i]; 54 dis = new DataInputStream(is); 55 dis.readFully(buf); 56 dis.close(); 57 return defineClass(name, buf, 0, buf.length); 58 } 59 } catch (SecurityException e) { 60 // This error will happen quite often (for example when loading 61 // "java.lang..."). 62 // Ignore this error and use parent class loader. 63 } catch (IOException e) { 64 // Unexpected error. Use parent class loader. 65 e.printStackTrace(); 66 } finally { 67 if (dis != null) { 68 try { 69 dis.close(); 70 } catch (IOException e) { 71 e.printStackTrace(); 72 } 73 } 74 } 75 return super.loadClass(name); 76 } 77 78 }