Apache Log4j provides the interface that applications should code to and provides the adapter components required for implementers to create a logging implementation.

Bytecode (Java 1.4) for Apache Log4j is provided in a JAR file like log4j-1.2.17.jar.

Source Code files for Apache Log4j are provided in both binary packge like log4j-1.2.17.zip and source package like log4j-1.2.17-sources.zip. You can download them at Apache Log4j Website.

You can also browse Source Code files for Apache Log4j 1.2.17 below.

⏎ org/apache/log4j/jmx/Agent.java

/*
 * 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.jmx;

import org.apache.log4j.Logger;

import javax.management.JMException;
import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.ObjectName;
import java.lang.reflect.InvocationTargetException;
import java.io.InterruptedIOException;


/**
 * Manages an instance of com.sun.jdmk.comm.HtmlAdapterServer which
 * was provided for demonstration purposes in the
 * Java Management Extensions Reference Implementation 1.2.1.
 * This class is provided to maintain compatibility with earlier
 * versions of log4j and use in new code is discouraged.
 *
 * @deprecated
 */
public class Agent {

    /**
     * Diagnostic logger.
     * @deprecated
     */
  static Logger log = Logger.getLogger(Agent.class);

    /**
     * Create new instance.
     * @deprecated
     */
  public Agent() {
  }

    /**
     * Creates a new instance of com.sun.jdmk.comm.HtmlAdapterServer
     * using reflection.
     *
     * @since 1.2.16
     * @return new instance.
     */
  private static Object createServer() {
      Object newInstance = null;
      try {
        newInstance = Class.forName(
                "com.sun.jdmk.comm.HtmlAdapterServer").newInstance();
      } catch (ClassNotFoundException ex) {
          throw new RuntimeException(ex.toString());
      } catch (InstantiationException ex) {
          throw new RuntimeException(ex.toString());
      } catch (IllegalAccessException ex) {
          throw new RuntimeException(ex.toString());
      }
      return newInstance;
  }

    /**
     * Invokes HtmlAdapterServer.start() using reflection.
     *
     * @since 1.2.16
     * @param server instance of com.sun.jdmk.comm.HtmlAdapterServer.
     */
  private static void startServer(final Object server) {
      try {
          server.getClass().getMethod("start", new Class[0]).
                  invoke(server, new Object[0]);
      } catch(InvocationTargetException ex) {
          Throwable cause = ex.getTargetException();
          if (cause instanceof RuntimeException) {
              throw (RuntimeException) cause;
          } else if (cause != null) {
              if (cause instanceof InterruptedException
                      || cause instanceof InterruptedIOException) {
                  Thread.currentThread().interrupt();
              }
              throw new RuntimeException(cause.toString());
          } else {
              throw new RuntimeException();
          }
      } catch(NoSuchMethodException ex) {
          throw new RuntimeException(ex.toString());
      } catch(IllegalAccessException ex) {
        throw new RuntimeException(ex.toString());
    }
  }


    /**
     * Starts instance of HtmlAdapterServer.
     * @deprecated
      */
  public void start() {

    MBeanServer server = MBeanServerFactory.createMBeanServer();
    Object html = createServer();

    try {
      log.info("Registering HtmlAdaptorServer instance.");
      server.registerMBean(html, new ObjectName("Adaptor:name=html,port=8082"));
      log.info("Registering HierarchyDynamicMBean instance.");
      HierarchyDynamicMBean hdm = new HierarchyDynamicMBean();
      server.registerMBean(hdm, new ObjectName("log4j:hiearchy=default"));
    } catch(JMException e) {
      log.error("Problem while registering MBeans instances.", e);
      return;
    } catch(RuntimeException e) {
      log.error("Problem while registering MBeans instances.", e);
      return;
    }
    startServer(html);
  }
}

⏎ org/apache/log4j/jmx/Agent.java

Or download all of them as a single archive file:

File name: log4j-1.2.17-sources.jar
File size: 481200 bytes
Release date: 2012-05-06
Download 

⇒ Download and Install apache-log4j-1.2.15.zip

⇐ Download and Install log4j-1.2.17.zip

⇑ Downloading Apache Log4j 1.x JAR Packages

⇑⇑ FAQ for Apache Log4j