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| 1 | /* | ||
| 2 | * Copyright (c) 1998, 2001, 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<sup><font size=-2>TM</font></sup> 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 String className; | ||
| 73 | |||
| 74 | public ClassNotLoadedException(String className) { | ||
| 75 | super(); | ||
| 76 | this.className = className; | ||
| 77 | } | ||
| 78 | |||
| 79 | public ClassNotLoadedException(String className, String message) { | ||
| 80 | super(message); | ||
| 81 | this.className = className; | ||
| 82 | } | ||
| 83 | |||
| 84 | public String className() { | ||
| 85 | return className; | ||
| 86 | } | ||
| 87 | } | ||