| <!DOCTYPE html> |
| |
| |
| <!-- |
| | Generated by Apache Maven Doxia Site Renderer 1.11.1 from target/generated-sources/site/markdown/log4j-1.2-api.md at 2024-03-06 |
| | Rendered using Apache Maven Fluido Skin 1.11.2 |
| --> |
| <html xmlns="http://www.w3.org/1999/xhtml" lang="en"> |
| <head> |
| <meta charset="UTF-8" /> |
| <meta name="viewport" content="width=device-width, initial-scale=1" /> |
| <meta name="generator" content="Apache Maven Doxia Site Renderer 1.11.1" /> |
| <title>Log4j – Log4j 1.2 Bridge</title> |
| <link rel="stylesheet" href="./css/apache-maven-fluido-1.11.2.min.css" /> |
| <link rel="stylesheet" href="./css/site.css" /> |
| <link rel="stylesheet" href="./css/print.css" media="print" /> |
| <script src="./js/apache-maven-fluido-1.11.2.min.js"></script> |
| </head> |
| <body class="topBarDisabled"> |
| <div class="container-fluid"> |
| <header> |
| <div id="banner"> |
| <div class="pull-left"><a href="../.." id="bannerLeft"><img src="images/ls-logo.jpg" alt="" style="" /></a></div> |
| <div class="pull-right"><a href="./" id="bannerRight"><img src="images/logo.png" alt="" style="" /></a></div> |
| <div class="clear"><hr/></div> |
| </div> |
| |
| <div id="breadcrumbs"> |
| <ul class="breadcrumb"> |
| <li id="publishDate">Last Published: 2024-03-06<span class="divider">|</span> |
| </li> |
| <li id="projectVersion">Version: 2.23.1</li> |
| <li class="pull-right"><span class="divider">|</span> |
| <a href="https://github.com/apache/logging-log4j2" class="externalLink" title="GitHub">GitHub</a></li> |
| <li class="pull-right"><span class="divider">|</span> |
| <a href="../../" title="Logging Services">Logging Services</a></li> |
| <li class="pull-right"><span class="divider">|</span> |
| <a href="https://www.apache.org/" class="externalLink" title="Apache">Apache</a></li> |
| <li class="pull-right"><a href="https://cwiki.apache.org/confluence/display/LOGGING/Log4j" class="externalLink" title="Logging Wiki">Logging Wiki</a></li> |
| </ul> |
| </div> |
| </header> |
| <div class="row-fluid"> |
| <header id="leftColumn" class="span2"> |
| <nav class="well sidebar-nav"> |
| <ul class="nav nav-list"> |
| <li class="nav-header"><img class="imageLink" src="img/glyphicons/home.png" alt="Apache Log4j™ 2" style="border: 0;" /> Apache Log4j™ 2</li> |
| <li><a href="index.html" title="About"><span class="none"></span>About</a></li> |
| <li><a href="download.html" title="Download"><span class="none"></span>Download</a></li> |
| <li><a href="support.html" title="Support"><span class="none"></span>Support</a></li> |
| <li><a href="maven-artifacts.html" title="Maven, Ivy, Gradle Artifacts"><span class="icon-chevron-right"></span>Maven, Ivy, Gradle Artifacts</a></li> |
| <li><a href="release-notes.html" title="Release Notes"><span class="none"></span>Release Notes</a></li> |
| <li><a href="faq.html" title="FAQ"><span class="none"></span>FAQ</a></li> |
| <li><a href="performance.html" title="Performance"><span class="icon-chevron-right"></span>Performance</a></li> |
| <li><a href="articles.html" title="Articles and Tutorials"><span class="none"></span>Articles and Tutorials</a></li> |
| <li><a href="security.html" title="Security"><span class="icon-chevron-right"></span>Security</a></li> |
| <li class="nav-header"><img class="imageLink" src="img/glyphicons/book.png" alt="Manual" style="border: 0;" /> Manual</li> |
| <li><a href="manual/index.html" title="Introduction"><span class="none"></span>Introduction</a></li> |
| <li><a href="manual/architecture.html" title="Architecture"><span class="none"></span>Architecture</a></li> |
| <li><a href="manual/api-separation.html" title="API Separation"><span class="none"></span>API Separation</a></li> |
| <li><a href="manual/migration.html" title="Log4j 1.x Migration"><span class="icon-chevron-right"></span>Log4j 1.x Migration</a></li> |
| <li><a href="manual/api.html" title="Java API"><span class="icon-chevron-right"></span>Java API</a></li> |
| <li><a href="../kotlin" title="Kotlin API"><span class="none"></span>Kotlin API</a></li> |
| <li><a href="../scala" title="Scala API"><span class="none"></span>Scala API</a></li> |
| <li><a href="manual/configuration.html" title="Configuration"><span class="icon-chevron-right"></span>Configuration</a></li> |
| <li><a href="manual/usage.html" title="Usage"><span class="icon-chevron-right"></span>Usage</a></li> |
| <li><a href="manual/webapp.html" title="Web Applications and JSPs"><span class="icon-chevron-right"></span>Web Applications and JSPs</a></li> |
| <li><a href="manual/lookups.html" title="Lookups"><span class="icon-chevron-right"></span>Lookups</a></li> |
| <li><a href="manual/appenders.html" title="Appenders"><span class="icon-chevron-right"></span>Appenders</a></li> |
| <li><a href="manual/layouts.html" title="Layouts"><span class="icon-chevron-right"></span>Layouts</a></li> |
| <li><a href="manual/filters.html" title="Filters"><span class="icon-chevron-right"></span>Filters</a></li> |
| <li><a href="manual/async.html" title="Async Loggers"><span class="icon-chevron-right"></span>Async Loggers</a></li> |
| <li><a href="manual/garbagefree.html" title="Garbage-free Logging"><span class="icon-chevron-right"></span>Garbage-free Logging</a></li> |
| <li><a href="manual/jmx.html" title="JMX"><span class="none"></span>JMX</a></li> |
| <li><a href="manual/logsep.html" title="Logging Separation"><span class="none"></span>Logging Separation</a></li> |
| <li><a href="manual/extending.html" title="Extending Log4j"><span class="icon-chevron-right"></span>Extending Log4j</a></li> |
| <li><a href="manual/plugins.html" title="Plugins"><span class="icon-chevron-right"></span>Plugins</a></li> |
| <li><a href="manual/customconfig.html" title="Programmatic Log4j Configuration"><span class="icon-chevron-right"></span>Programmatic Log4j Configuration</a></li> |
| <li><a href="manual/customloglevels.html" title="Custom Log Levels"><span class="icon-chevron-right"></span>Custom Log Levels</a></li> |
| <li class="nav-header"><img class="imageLink" src="img/glyphicons/pencil.png" alt="For Contributors" style="border: 0;" /> For Contributors</li> |
| <li><a href="guidelines.html" title="Guidelines"><span class="none"></span>Guidelines</a></li> |
| <li><a href="javastyle.html" title="Style Guide"><span class="none"></span>Style Guide</a></li> |
| <li class="nav-header"><img class="imageLink" src="img/glyphicons/cog.png" alt="Components" style="border: 0;" /> Components</li> |
| <li><a href="log4j-api.html" title="API"><span class="none"></span>API</a></li> |
| <li><a href="log4j-jcl.html" title="Commons Logging Bridge"><span class="none"></span>Commons Logging Bridge</a></li> |
| <li class="active"><a><span class="none"></span>Log4j 1.2 API</a></li> |
| <li><a href="log4j-slf4j-impl.html" title="SLF4J Binding"><span class="none"></span>SLF4J Binding</a></li> |
| <li><a href="log4j-jul.html" title="JUL Adapter"><span class="none"></span>JUL Adapter</a></li> |
| <li><a href="log4j-jpl.html" title="JDK Platform Logger"><span class="none"></span>JDK Platform Logger</a></li> |
| <li><a href="log4j-to-slf4j.html" title="Log4j 2 to SLF4J Adapter"><span class="none"></span>Log4j 2 to SLF4J Adapter</a></li> |
| <li><a href="log4j-flume-ng.html" title="Apache Flume Appender"><span class="none"></span>Apache Flume Appender</a></li> |
| <li><a href="log4j-taglib.html" title="Log4j Tag Library"><span class="none"></span>Log4j Tag Library</a></li> |
| <li><a href="log4j-jmx-gui.html" title="Log4j JMX GUI"><span class="none"></span>Log4j JMX GUI</a></li> |
| <li><a href="log4j-web.html" title="Log4j Web Application Support"><span class="none"></span>Log4j Web Application Support</a></li> |
| <li><a href="log4j-jakarta-web.html" title="Log4j Jakarta Web Application Support"><span class="none"></span>Log4j Jakarta Web Application Support</a></li> |
| <li><a href="log4j-appserver.html" title="Log4j Application Server Integration"><span class="none"></span>Log4j Application Server Integration</a></li> |
| <li><a href="log4j-couchdb.html" title="Log4j CouchDB appender"><span class="none"></span>Log4j CouchDB appender</a></li> |
| <li><a href="log4j-mongodb3.html" title="Log4j MongoDB3 appender"><span class="none"></span>Log4j MongoDB3 appender</a></li> |
| <li><a href="log4j-mongodb4.html" title="Log4j MongoDB4 appender"><span class="none"></span>Log4j MongoDB4 appender</a></li> |
| <li><a href="log4j-cassandra.html" title="Log4j Cassandra appender"><span class="none"></span>Log4j Cassandra appender</a></li> |
| <li><a href="log4j-iostreams.html" title="Log4j IO Streams"><span class="none"></span>Log4j IO Streams</a></li> |
| <li><a href="log4j-docker.html" title="Log4j Docker Support"><span class="none"></span>Log4j Docker Support</a></li> |
| <li><a href="log4j-kubernetes.html" title="Log4j Kubernetes Support"><span class="none"></span>Log4j Kubernetes Support</a></li> |
| <li><a href="log4j-spring-boot.html" title="Log4j Spring Boot"><span class="none"></span>Log4j Spring Boot</a></li> |
| <li><a href="log4j-spring-cloud-config-client.html" title="Log4j Spring Cloud Config Client"><span class="none"></span>Log4j Spring Cloud Config Client</a></li> |
| <li class="nav-header"><img class="imageLink" src="img/glyphicons/tag.png" alt="Related Projects" style="border: 0;" /> Related Projects</li> |
| <li><a href="../../chainsaw/2.x/index.html" title="Chainsaw"><span class="none"></span>Chainsaw</a></li> |
| <li><a href="../../log4cxx/latest_stable/index.html" title="Log4Cxx"><span class="none"></span>Log4Cxx</a></li> |
| <li><a href="../../log4j-audit/latest/index.html" title="Log4j Audit"><span class="none"></span>Log4j Audit</a></li> |
| <li><a href="../kotlin" title="Log4j Kotlin"><span class="none"></span>Log4j Kotlin</a></li> |
| <li><a href="../scala" title="Log4j Scala"><span class="none"></span>Log4j Scala</a></li> |
| <li><a href="../transform" title="Log4j Transform"><span class="none"></span>Log4j Transform</a></li> |
| <li><a href="../../log4net/index.html" title="Log4Net"><span class="none"></span>Log4Net</a></li> |
| <li class="nav-header"><img class="imageLink" src="img/glyphicons/link.png" alt="Legacy Sites" style="border: 0;" /> Legacy Sites</li> |
| <li><a href="../log4j-2.12.4/" title="Log4j 2.12.4 - Java 7"><span class="none"></span>Log4j 2.12.4 - Java 7</a></li> |
| <li><a href="../log4j-2.3.2/" title="Log4j 2.3.2 - Java 6"><span class="none"></span>Log4j 2.3.2 - Java 6</a></li> |
| <li><a href="../1.2/" title="Log4j 1.2 - End of Life"><span class="none"></span>Log4j 1.2 - End of Life</a></li> |
| <li class="nav-header"><img class="imageLink" src="img/glyphicons/info.png" alt="Project Information" style="border: 0;" /> Project Information</li> |
| <li><a href="team.html" title="Project Team"><span class="none"></span>Project Team</a></li> |
| <li><a href="https://www.apache.org/licenses/LICENSE-2.0" class="externalLink" title="Project License"><span class="none"></span>Project License</a></li> |
| <li><a href="https://github.com/apache/logging-log4j2" class="externalLink" title="Source Repository"><span class="none"></span>Source Repository</a></li> |
| <li><a href="runtime-dependencies.html" title="Runtime Dependencies"><span class="none"></span>Runtime Dependencies</a></li> |
| <li><a href="javadoc.html" title="Javadoc"><span class="none"></span>Javadoc</a></li> |
| <li><a href="thanks.html" title="Thanks"><span class="none"></span>Thanks</a></li> |
| </ul> |
| </nav> |
| <div class="well sidebar-nav"> |
| <div id="poweredBy"> |
| <div class="clear"></div> |
| <div class="clear"></div> |
| <div class="clear"></div> |
| <a href="http://maven.apache.org/" title="Built by Maven" class="poweredBy"><img class="builtBy" alt="Built by Maven" src="./images/logos/maven-feather.png" /></a> |
| </div> |
| </div> |
| </header> |
| <main id="bodyColumn" class="span10" > |
| <!-- vim: set syn=markdown : --> |
| <!-- |
| 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. |
| --> |
| <h1>Log4j 1.2 Bridge</h1> |
| <p>The Log4j 1.2 Bridge allows applications coded to use Log4j 1.2 API to use Log4j 2 instead.</p><section> |
| <h2><a name="Requirements"></a>Requirements</h2> |
| <p>The Log4j 1.2 bridge is dependent on the Log4j 2 API. The following Log4j 1.x methods will behave differently when |
| the Log4j 2 Core module is included then when it is not:</p> |
| <table border="0" class="table table-striped"> |
| <thead> |
| |
| <tr class="a"> |
| <th>Method</th> |
| <th>Without log4j-core</th> |
| <th>With log4j-core</th></tr> |
| </thead><tbody> |
| |
| <tr class="b"> |
| <td align="left">Category.getParent()</td> |
| <td>Returns null</td> |
| <td>Returns parent logger</td></tr> |
| <tr class="a"> |
| <td align="left">Category.setLevel()</td> |
| <td>NoOp</td> |
| <td>Sets Logger Level</td></tr> |
| <tr class="b"> |
| <td align="left">Category.setPriority()</td> |
| <td>NoOp</td> |
| <td>Sets Logger Level</td></tr> |
| <tr class="a"> |
| <td align="left">Category.getAdditivity()</td> |
| <td>Returns false</td> |
| <td>Returns Logger's additivity setting</td></tr> |
| <tr class="b"> |
| <td align="left">Category.setAdditivity()</td> |
| <td>NoOp</td> |
| <td>Sets additivity of LoggerConfig</td></tr> |
| <tr class="a"> |
| <td align="left">Category.getResourceBundle()</td> |
| <td>NoOp</td> |
| <td>Returns the resource bundle associated with the Logger</td></tr> |
| <tr class="b"> |
| <td align="left">BasicConfigurator.configure()</td> |
| <td>NoOp</td> |
| <td>Reconfigures Log4j 2</td></tr> |
| </tbody> |
| </table> |
| <p>If log4j-core is not present location information will not be accurate in calls using the Log4j 1.2 API. The config |
| package which attempts to convert Log4j 1.x configurations to Log4j 2 is not supported without Log4j 2.</p> |
| <p>For more information, see <a href="runtime-dependencies.html">Runtime Dependencies</a>.</p></section><section> |
| <h2><a name="Usage"></a>Usage</h2> |
| <p>To use the Log4j Legacy Bridge, you must first identify and remove all the Log4j 1.x JARs from the application and |
| replace them with the bridge JAR. Once in place, all logging that uses Log4j 1.x will be routed to Log4j 2.</p> |
| <p>If you are using Maven, you can easily identify any Log4j 1.x dependencies in your project by |
| running the following command in your terminal:</p> |
| |
| <div class="source"><pre class="prettyprint"><code>mvn dependency:tree | grep 'log4j:log4j:' |
| </code></pre></div> |
| <p>This command will generate a dependency tree for your project and filter the results to show only Log4j 1.x dependencies. |
| If you find any, you will need to update your pom.xml file to remove Log4j1 or exclude them otherwise.</p> |
| <p>While we have improved the compatibility of the bridge in the past, applications that try to modify legacy Log4j |
| by adding Appenders, Filters, etc, may experience problems. In this case, migrating those components to Log4j 2 |
| first is recommended.</p></section> |
| </main> |
| </div> |
| </div> |
| <hr/> |
| <footer> |
| <div class="container-fluid"> |
| <div class="row-fluid"> |
| <p align="center">Copyright © 1999-2024 <a class="external" href="https://www.apache.org">The Apache Software Foundation</a>. All Rights Reserved.<br> |
| Apache Logging, Apache Log4j, Log4j, Apache, the Apache feather logo, and the Apache Logging project logo are trademarks of The Apache Software Foundation.</p> |
| </div> |
| </div> |
| </footer> |
| <script> |
| if(anchors) { |
| anchors.add(); |
| } |
| </script> |
| </body> |
| </html> |
