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 = "JFR TestClassLoader"; 38 39 public TestClassLoader() { 40 super(CLASS_LOADER_NAME, ClassLoader.getSystemClassLoader()); 41 } 42 43 public Class<?> loadClass(String name) throws ClassNotFoundException { 44 45 InputStream is = null; 46 DataInputStream dis = null; 47 try { 48 String resourceName = name.replace('.', '/') + ".class"; 49 is = getResourceAsStream(resourceName); 50 if (is != null) { 51 int i = is.available(); 52 byte buf[] = new byte[i]; 53 dis = new DataInputStream(is); 54 dis.readFully(buf); 55 dis.close(); 56 return defineClass(name, buf, 0, buf.length); 57 } 58 } catch (SecurityException e) { 59 // This error will happen quite often (for example when loading 60 // "java.lang..."). 61 // Ignore this error and use parent class loader. 62 } catch (IOException e) { 63 // Unexpected error. Use parent class loader. 64 e.printStackTrace(); 65 } finally { 66 if (dis != null) { 67 try { 68 dis.close(); 69 } catch (IOException e) { 70 e.printStackTrace(); 71 } 72 } 73 } 74 return super.loadClass(name); 75 } 76 77 }