/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.servlet;


/**
 * Defines a general exception a servlet can throw when it
 * encounters difficulty.
 *
 * @author 	Various
 *
 */
public class ServletException extends Exception {

    /**
     * Constructs a new servlet exception.
     */
    public ServletException() {
        super();
    }

    /**
     * Constructs a new servlet exception with the
     * specified message. The message can be written 
     * to the server log and/or displayed for the user. 
     *
     * @param message 		a <code>String</code> 
     *				specifying the text of 
     *				the exception message
     */
    public ServletException(String message) {
        super(message);
    }

    /**
     * Constructs a new servlet exception when the servlet 
     * needs to throw an exception and include a message 
     * about the "root cause" exception that interfered with its 
     * normal operation, including a description message.
     *
     * @param message 		a <code>String</code> containing 
     *				the text of the exception message
     *
     * @param rootCause		the <code>Throwable</code> exception 
     *				that interfered with the servlet's
     *				normal operation, making this servlet
     *				exception necessary
     */
    public ServletException(String message, Throwable rootCause) {
        super(message, rootCause);
    }

    /**
     * Constructs a new servlet exception when the servlet 
     * needs to throw an exception and include a message
     * about the "root cause" exception that interfered with its
     * normal operation.  The exception's message is based on the localized
     * message of the underlying exception.
     *
     * <p>This method calls the <code>getLocalizedMessage</code> method
     * on the <code>Throwable</code> exception to get a localized exception
     * message. When subclassing <code>ServletException</code>, 
     * this method can be overridden to create an exception message 
     * designed for a specific locale.
     *
     * @param rootCause 	the <code>Throwable</code> exception
     * 				that interfered with the servlet's
     *				normal operation, making the servlet exception
     *				necessary
     */
    public ServletException(Throwable rootCause) {
        super(rootCause);
    }

    /**
     * Returns the exception that caused this servlet exception.
     *
     * @return			the <code>Throwable</code> 
     *				that caused this servlet exception
     */
    public Throwable getRootCause() {
        return getCause();
    }
}
