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Reload4j revives EOLed log4j 1.x
There is a newer version: 1.2.25
/*
 * 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.log4j;

import org.apache.log4j.spi.OptionHandler;
import org.apache.log4j.spi.LoggingEvent;

/**
 * Extend this abstract class to create your own log layout format.
 * 
 * @author Ceki Gülcü
 * 
 */

public abstract class Layout implements OptionHandler {

    // Note that the line.separator property can be looked up even by
    // applets.
    public final static String LINE_SEP = System.getProperty("line.separator");
    public final static int LINE_SEP_LEN = LINE_SEP.length();

    /**
     * Implement this method to create your own layout format.
     */
    abstract public String format(LoggingEvent event);

    /**
     * Returns the content type output by this layout. The base class returns
     * "text/plain".
     */
    public String getContentType() {
	return "text/plain";
    }

    /**
     * Returns the header for the layout format. The base class returns
     * null.
     */
    public String getHeader() {
	return null;
    }

    /**
     * Returns the footer for the layout format. The base class returns
     * null.
     */
    public String getFooter() {
	return null;
    }

    /**
     * If the layout handles the throwable object contained within
     * {@link LoggingEvent}, then the layout should return false.
     * Otherwise, if the layout ignores throwable object, then the layout should
     * return true. If ignoresThrowable is true, the appender is
     * responsible for rendering the throwable.
     * 
     * 
     * The {@link SimpleLayout}, {@link TTCCLayout}, {@link PatternLayout} all
     * return true. The {@link org.apache.log4j.xml.XMLLayout} returns
     * false.
     * 
     * @since 0.8.4
     */
    abstract public boolean ignoresThrowable();

}