/* * Copyright 1999-2005 The Apache Software Foundation. *  * Licensed 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.log4j.config;/** * Thrown when an error is encountered whilst attempting to set a property * using the {@link PropertySetter} utility class. *  * @author Anders Kristensen * @since 1.1 */public class PropertySetterException extends Exception {  protected Throwable rootCause;    public  PropertySetterException(String msg) {    super(msg);  }    public  PropertySetterException(Throwable rootCause)  {    super();    this.rootCause = rootCause;  }    /**     Returns descriptive text on the cause of this exception.   */  public  String getMessage() {    String msg = super.getMessage();    if (msg == null && rootCause != null) {      msg = rootCause.getMessage();    }    return msg;  }}