1 /* 2 * Copyright (c) 1998, 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. 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 com.sun.jdi; 27 28 /** 29 * Thrown to indicate that the requested class has 30 * not yet been loaded through the appropriate class loader. 31 * <p> 32 * Due to the lazy class linking performed by many VMs, it is 33 * possible for a field or variable to be visible in a program 34 * before the associated class is loaded. Until the class is loaded 35 * all that is available is a signature string. If an attempt is made to 36 * set the value of such a field or variable from JDI, the appropriate 37 * type checking cannot be done because the destination class has not been 38 * loaded. The same is true for the element class of array elements. 39 * <p> 40 * It is not advisable to solve this problem by attempting a class load on 41 * the fly in this case. There are two problems in having the debugger load 42 * a class instead of waiting for it to load over the normal course 43 * of events. 44 * <ul> 45 * <li>There can be no guarantee that running the appropriate class 46 * loader won't cause a deadlock in loading the 47 * class. Class loaders can consist of arbitrary 48 * Java™ programming language code and the 49 * class loading methods are usually synchronized. Most of the work 50 * done by a debugger happens when threads are suspended. If another 51 * application thread is suspended within the same class loader, 52 * a deadlock is very possible. 53 * <li>Changing the order in which classes are normally loaded may either mask 54 * or reveal bugs in the application. An unintrusive debugger should strive 55 * to leave unchanged the behavior of the application being debugged. 56 * </ul> 57 * To avoid these potential problems, this exception is thrown. 58 * <p> 59 * Note that this exception will be thrown until the class in question 60 * is visible to the class loader of enclosing class. (That is, the 61 * class loader of the enclosing class must be an <i>initiating</i> class 62 * loader for the class in question.) 63 * See 64 * <cite>The Java™ Virtual Machine Specification</cite> 65 * for more details. 66 * 67 * @author Gordon Hirsch 68 * @since 1.3 69 */ 70 public class ClassNotLoadedException extends Exception { 71 72 private static final long serialVersionUID = -6242978768444298722L; 73 74 private String className; 75 ClassNotLoadedException(String className)76 public ClassNotLoadedException(String className) { 77 super(); 78 this.className = className; 79 } 80 ClassNotLoadedException(String className, String message)81 public ClassNotLoadedException(String className, String message) { 82 super(message); 83 this.className = className; 84 } 85 className()86 public String className() { 87 return className; 88 } 89 } 90