code: /*
   * Copyright (c) 1999, 2006, 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.reflect;
  
  /**
   * Thrown by a method invocation on a proxy instance if its invocation
   * handler's {@link InvocationHandler#invoke invoke} method throws a
   * checked exception (a {@code Throwable} that is not assignable
   * to {@code RuntimeException} or {@code Error}) that
   * is not assignable to any of the exception types declared in the
   * {@code throws} clause of the method that was invoked on the
   * proxy instance and dispatched to the invocation handler.
   *
   * <p>An {@code UndeclaredThrowableException} instance contains
   * the undeclared checked exception that was thrown by the invocation
   * handler, and it can be retrieved with the
   * {@code getUndeclaredThrowable()} method.
   * {@code UndeclaredThrowableException} extends
   * {@code RuntimeException}, so it is an unchecked exception
   * that wraps a checked exception.
   *
   * <p>As of release 1.4, this exception has been retrofitted to
   * conform to the general purpose exception-chaining mechanism.  The
   * "undeclared checked exception that was thrown by the invocation
   * handler" that may be provided at construction time and accessed via
   * the {@link #getUndeclaredThrowable()} 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      Peter Jones
   * @see         InvocationHandler
   * @since       1.3
   */
  public class UndeclaredThrowableException extends RuntimeException {
      static final long serialVersionUID = 330127114055056639L;
  
      /**
       * the undeclared checked exception that was thrown
       * @serial
       */
      private Throwable undeclaredThrowable;
  
      /**
       * Constructs an {@code UndeclaredThrowableException} with the
       * specified {@code Throwable}.
       *
       * @param   undeclaredThrowable the undeclared checked exception
       *          that was thrown
       */
      public UndeclaredThrowableException(Throwable undeclaredThrowable) {
          super((Throwable) null);  // Disallow initCause
          this.undeclaredThrowable = undeclaredThrowable;
      }
  
      /**
       * Constructs an {@code UndeclaredThrowableException} with the
       * specified {@code Throwable} and a detail message.
       *
       * @param   undeclaredThrowable the undeclared checked exception
       *          that was thrown
       * @param   s the detail message
       */
      public UndeclaredThrowableException(Throwable undeclaredThrowable,
                                          String s)
      {
          super(s, null);  // Disallow initCause
          this.undeclaredThrowable = undeclaredThrowable;
      }
  
      /**
       * Returns the {@code Throwable} instance wrapped in this
       * {@code UndeclaredThrowableException}, which may be {@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 undeclared checked exception that was thrown
       */
      public Throwable getUndeclaredThrowable() {
          return undeclaredThrowable;
      }
  
      /**
       * Returns the cause of this exception (the {@code Throwable}
       * instance wrapped in this {@code UndeclaredThrowableException},
       * which may be {@code null}).
       *
       * @return  the cause of this exception.
       * @since   1.4
       */
      public Throwable getCause() {
          return undeclaredThrowable;
      }
  
      // DIFFBLUE MODEL LIBRARY
      // While Object.getClass() is not modelled, we can get the same
      // functionality by adding one toString() method per subclass of
      // Throwable.
      @Override
      public String toString() {
          String message = getLocalizedMessage();
          return (message != null)
              ? ("java.lang.reflect.UndeclaredThrowableException: " + message)
              : "java.lang.reflect.UndeclaredThrowableException";
      }
  }
  