content: /*
   * 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 {@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     Class#forName(String)
   * @see     ClassLoader#findSystemClass(String)
   * @see     ClassLoader#loadClass(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   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 <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;
      }
  }
  