/* * 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 org.apache.commons.fileupload;import java.io.PrintStream;import java.io.PrintWriter;/** * Exception for errors encountered while processing the request. * * @author <a href="mailto:jmcnally@collab.net">John McNally</a> * @version $Id: FileUploadException.java 479484 2006-11-27 01:06:53Z jochen $ */public class FileUploadException extends Exception {    /**     * Serial version UID, being used, if the exception     * is serialized.     */    private static final long serialVersionUID = 8881893724388807504L;    /**     * The exceptions cause. We overwrite the cause of     * the super class, which isn't available in Java 1.3.     */    private final Throwable cause;    /**     * Constructs a new <code>FileUploadException</code> without message.     */    public FileUploadException() {        this(null, null);    }    /**     * Constructs a new <code>FileUploadException</code> with specified detail     * message.     *     * @param msg the error message.     */    public FileUploadException(final String msg) {        this(msg, null);    }    /**     * Creates a new <code>FileUploadException</code> with the given     * detail message and cause.     * @param msg The exceptions detail message.     * @param cause The exceptions cause.     */    public FileUploadException(String msg, Throwable cause) {        super(msg);        this.cause = cause;    }    /**     * Prints this throwable and its backtrace to the specified print stream.     *     * @param stream <code>PrintStream</code> to use for output     */    public void printStackTrace(PrintStream stream) {        super.printStackTrace(stream);        if (cause != null) {            stream.println("Caused by:");            cause.printStackTrace(stream);        }    }    /**     * Prints this throwable and its backtrace to the specified     * print writer.     *     * @param writer <code>PrintWriter</code> to use for output     */    public void printStackTrace(PrintWriter writer) {        super.printStackTrace(writer);        if (cause != null) {            writer.println("Caused by:");            cause.printStackTrace(writer);        }    }}