/*
 * Copyright (c) 1995, 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

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 {@link #getException()} 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 1.0
 */
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 s the 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 {@code null}.
 *
 * <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
 * {@code null}).
 *
 * @return the cause of this exception.
 * @since 1.4
 */
 public Throwable getCause() {
 return ex;
 }
}