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. =========== Using log4j =========== 1) First untar or unzip the distribution file. 2) Assuming you chose to extract the distribution in to the PATH_OF_YOUR_CHOICE, untarring the distribution file should create a logging-log4j-VERSION directory, where VERSION is the log4j version number, under PATH_OF_YOUR_CHOICE. We will refer to the directory PATH_OF_YOUR_CHOICE/apache-log4j-VERSION/ as $LOG4J_HOME/. 3) Add $LOG4J_HOME/log4j-VERSION.jar to your CLASSPATH, 4) You can now test your installation by first compiling the following simple program. import org.apache.log4j.Logger; import org.apache.log4j.BasicConfigurator; public class Hello { private static final Logger logger = Logger.getLogger(Hello.class); public static void main(String argv[]) { BasicConfigurator.configure(); logger.debug("Hello world."); logger.info("What a beatiful day."); } } After compilation, try it out by issuing the command java Hello You should see log statements appearing on the console. 5) Refer to the javadoc documentation and the user manual on how to include log statements in your own code. ========= JAR files ========= The log4j distribution comes with one jar file: log4j-VERSION.jar under the LOG4J_HOME directory. This jar file contains all the class files of the log4j project, except test cases and classes from the "examples" and "org.apache.log4j.performance" packages. ============== Building log4j ============== log4j (as of 1.2.15) is built with Maven 2. To rebuild log4j, place Maven 2 on the PATH and execute "mvn package". The resulting jar will be placed in the target subdirectory. If building with JDK 1.4, one dependency will need to be manually installed since its license does not allow it to be placed in the online maven repositories. If not already installed, a build attempt will describe where to download and how to install the dependency. To install the dependency: Download JMX 1.2.1 from http://java.sun.com/products/JavaManagement/download.html. $ jar xf jmx-1_2_1-ri.zip $ mvn install:install-file -DgroupId=com.sun.jmx -DartifactId=jmxri \ -Dversion=1.2.1 -Dpackaging=jar -Dfile=jmx-1_2_1-bin/lib/jmxri.jar The build script will attempt to build NTEventLogAppender.dll if MinGW is available on the path. If the unit tests are run on Windows without NTEventLogAppender.dll, many warnings of the missing DLL will be generated. An installer for MinGW on Windows is available for download at http://sourceforge.net/project/showfiles.php?group_id=2435. MinGW is also available through the package managers of many Linux distributions. In case of problems send an e-mail note to log4j-user@logging.apache.org. Please do not directly e-mail any log4j developers. The answer to your question might be useful to other users. Moreover, there are many knowledgeable users on the log4j-user mailing lists who can quickly answer your questions.