/*
 
* Copyright (c) 1995, 2004, 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
 
* or visit www.oracle.com if you need additional information or have any
 
* questions.
 
*/

package java.lang;

/**
 
* Thrown when an application tries to load in a class through its
 
* string name using:
 
* <ul>
 
* <li>The <code>forName</code> method in class <code>Class</code>.
 
* <li>The <code>findSystemClass</code> method in class
 
*
     
<code>ClassLoader</code> .
 
* <li>The <code>loadClass</code> method in class <code>ClassLoader</code>.
 
* </ul>
 
* <p>
 
* but no definition for the class with the specified name could be found.
 
*
 
* <p>As of release 1.4, this exception has been retrofitted to conform to
 
* the general purpose exception-chaining mechanism.
  
The "optional exception
 
* that was raised while loading the class" that may be provided at
 
* construction time and accessed via the
 
method is
 
* now known as the <i>cause</i>, and may be accessed via the {@link
 
* Throwable#getCause()} method, as well as the aforementioned "legacy method."
 
*
 
* @author
  
unascribed
 
* @see
     
java.lang.Class#forName(java.lang.String)
 
* @see
     
java.lang.ClassLoader#findSystemClass(java.lang.String)
 
* @see
     
java.lang.ClassLoader#loadClass(java.lang.String, boolean)
 
* @since
   
JDK1.0
 
*/

public class ClassNotFoundException extends ReflectiveOperationException {
    
/**
     
* use serialVersionUID from JDK 1.1.X for interoperability
     
*/
     
private static final long serialVersionUID = 9176873029745254542L;

    
/**
     
* This field holds the exception ex if the
     
* ClassNotFoundException(String s, Throwable ex) constructor was
     
* used to instantiate the object
     
* @serial
     
* @since 1.2
     
*/

    
private Throwable ex;

    
/**
     
* Constructs a <code>ClassNotFoundException</code> with no detail message.
     
*/
    
public ClassNotFoundException() {
        
super((Throwable)null);
  
// Disallow initCause
    
}

    
/**
     
* Constructs a <code>ClassNotFoundException</code> with the
     
* specified detail message.
     
*
     
* @param
   
sthe detail message.
     
*/

    
public ClassNotFoundException(String s) {
        
super(s, null);
  
//
  
Disallow initCause
    
}

    
/**
     
* Constructs a <code>ClassNotFoundException</code> with the
     
* specified detail message and optional exception that was
     
* raised while loading the class.
     
*
     
* @param s the detail message
     
* @param ex the exception that was raised while loading the class
     
* @since 1.2
     
*/

    
public ClassNotFoundException(String s, Throwable ex) {
        
super(s, null);
  
//
  
Disallow initCause
        
this.ex = ex;
    
}

    
/**
     
* Returns the exception that was raised if an error occurred while
     
* attempting to load the class. Otherwise, returns <tt>null</tt>.
     
*
     
* <p>This method predates the general-purpose exception chaining facility.
     
* The {@link Throwable#getCause()} method is now the preferred means of
     
* obtaining this information.
     
*
     
* @return the <code>Exception</code> that was raised while loading a class
     
* @since 1.2
     
*/

    
public Throwable getException() {
        
return ex;
    
}

    
/**
     
* Returns the cause of this exception (the exception that was raised
     
* if an error occurred while attempting to load the class; otherwise
     
* <tt>null</tt>).
     
*
     
* @return
  
the cause of this exception.
     
* @since
   
1.4
     
*/

    
public Throwable getCause() {
        
return ex;
    
}
}