001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.apache.commons.net.smtp;
019
020import java.io.IOException;
021
022/**
023 * SMTPConnectionClosedException is used to indicate the premature or unexpected closing of an SMTP connection resulting from a
024 * {@link org.apache.commons.net.smtp.SMTPReply#SERVICE_NOT_AVAILABLE SMTPReply.SERVICE_NOT_AVAILABLE } response (SMTP reply code 421) to a failed SMTP command.
025 * This exception is derived from IOException and therefore may be caught either as an IOException or specifically as an SMTPConnectionClosedException.
026 *
027 *
028 * @see SMTP
029 * @see SMTPClient
030 */
031public final class SMTPConnectionClosedException extends IOException {
032
033    private static final long serialVersionUID = 626520434326660627L;
034
035    /** Constructs a SMTPConnectionClosedException with no message */
036    public SMTPConnectionClosedException() {
037    }
038
039    /**
040     * Constructs a SMTPConnectionClosedException with a specified message.
041     *
042     * @param message The message explaining the reason for the exception.
043     */
044    public SMTPConnectionClosedException(final String message) {
045        super(message);
046    }
047
048}