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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright 2005-2006 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */
package com.sun.tools.attach;

/**
 * The exception thrown when an agent fails to initialize in the target Java virtual machine.
 * 
 * 
 This exception is thrown by {@link
 * VirtualMachine#loadAgent VirtualMachine.loadAgent},
 * {@link VirtualMachine#loadAgentLibrary
 * VirtualMachine.loadAgentLibrary}, {@link
 * VirtualMachine#loadAgentPath VirtualMachine.loadAgentPath}
 * methods if an agent, or agent library, cannot be initialized.
 * When thrown by VirtualMachine.loadAgentLibrary, or
 * VirtualMachine.loadAgentPath then the exception encapsulates
 * the error returned by the agent's Agent_OnAttach function.
 * This error code can be obtained by invoking the {@link #returnValue() returnValue} method.
 */
public final class AgentInitializationException extends Exception
{
   private static final long serialVersionUID = -1508756333332806353L;

   private final int returnValue;

   /**
    * Constructs an AgentInitializationException with
    * no detail message.
    */
   public AgentInitializationException()
   {
      returnValue = 0;
   }

   /**
    * Constructs an AgentInitializationException with the specified detail message.
    *
    * @param s the detail message.
    */
   public AgentInitializationException(String s)
   {
      super(s);
      returnValue = 0;
   }

   /**
    * Constructs an AgentInitializationException with
    * the specified detail message and the return value from the
    * execution of the agent's Agent_OnAttach function.
    *
    * @param s           the detail message.
    * @param returnValue the return value
    */
   public AgentInitializationException(String s, int returnValue)
   {
      super(s);
      this.returnValue = returnValue;
   }

   /**
    * If the exception was created with the return value from the agent
    * Agent_OnAttach function then this returns that value,
    * otherwise returns 0. 
    */
   public int returnValue()
   {
      return returnValue;
   }
}