JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package com.sun.jdi;

/**
 * Thrown to indicate that the requested class has
 * not yet been loaded through the appropriate class loader.
 * <p>
 * Due to the lazy class linking performed by many VMs, it is
 * possible for a field or variable to be visible in a program
 * before the associated class is loaded. Until the class is loaded
 * all that is available is a signature string. If an attempt is made to
 * set the value of such a field or variable from JDI, the appropriate
 * type checking cannot be done because the destination class has not been
 * loaded. The same is true for the element class of array elements.
 * <p>
 * It is not advisable to solve this problem by attempting a class load on
 * the fly in this case. There are two problems in having the debugger load
 * a class instead of waiting for it to load over the normal course
 * of events.
 * <ul>
 * <li>There can be no guarantee that running the appropriate class
 * loader won't cause a deadlock in loading the
 * class. Class loaders can consist of arbitrary
 * Java<sup><font size=-2>TM</font></sup> programming language code and the
 * class loading methods are usually synchronized. Most of the work
 * done by a debugger happens when threads are suspended. If another
 * application thread is suspended within the same class loader,
 *  a deadlock is very possible.
 * <li>Changing the order in which classes are normally loaded may either mask
 * or reveal bugs in the application. An unintrusive debugger should strive
 * to leave unchanged the behavior of the application being debugged.
 * </ul>
 * To avoid these potential problems, this exception is thrown.
 * <p>
 * Note that this exception will be thrown until the class in question
 * is visible to the class loader of enclosing class. (That is, the
 * class loader of the enclosing class must be an <i>initiating</i> class
 * loader for the class in question.)
 * See
 * <cite>The Java&trade; Virtual Machine Specification</cite>
 * for more details.
 *
 * @author Gordon Hirsch
 * @since  1.3
 */
@jdk.Exported
public class ClassNotLoadedException extends Exception
{

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