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    package org.apache.log4j.config;
018    
019    /**
020     * Thrown when an error is encountered whilst attempting to set a property
021     * using the {@link PropertySetter} utility class.
022     *
023     * @since 1.1
024     */
025    public class PropertySetterException extends Exception {
026        private static final long serialVersionUID = -1352613734254235861L;
027    
028        /**
029         * The root cause.
030         */
031        protected Throwable rootCause;
032    
033        /**
034         * Construct the exception with the given message.
035         *
036         * @param msg The message
037         */
038        public PropertySetterException(final String msg) {
039            super(msg);
040        }
041    
042        /**
043         * Construct the exception with the given root cause.
044         *
045         * @param rootCause The root cause
046         */
047        public PropertySetterException(final Throwable rootCause) {
048            super();
049            this.rootCause = rootCause;
050        }
051    
052        /**
053         * Returns descriptive text on the cause of this exception.
054         *
055         * @return the descriptive text.
056         */
057        @Override
058        public String getMessage() {
059            String msg = super.getMessage();
060            if (msg == null && rootCause != null) {
061                msg = rootCause.getMessage();
062            }
063            return msg;
064        }
065    }