| <!DOCTYPE html> |
| |
| |
| <!-- |
| | Generated by Apache Maven Doxia Site Renderer 1.11.1 from target/generated-sources/site/xdoc/manual/jmx.xml.vm 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" /> |
| <meta name="author" content="Remko Popma" /> |
| <meta name="author" content="Volkan Yazıcı" /> |
| <title>Log4j – JMX</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 class="active"><a><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><a href="../log4j-1.2-api.html" title="Log4j 1.2 API"><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" > |
| |
| |
| <section> |
| <h2><a name="JMX"></a>JMX</h2> |
| |
| <p> |
| Log4j 2 has built-in support for JMX. |
| The StatusLogger, ContextSelector, and all LoggerContexts, |
| LoggerConfigs and Appenders are instrumented with MBeans and can |
| be remotely monitored and controlled. |
| </p> |
| |
| <p>Also included is a simple client GUI that can be used to |
| monitor the StatusLogger output, as well as to remotely reconfigure |
| Log4j with a different configuration file, or to edit the |
| current configuration directly. |
| </p> |
| </section> |
| <section> |
| <h2><a name="Enabling_JMX"></a>Enabling JMX</h2> |
| <a name="Enabling_JMX"></a> |
| |
| <p>JMX support is enabled by default. When Log4j initializes, |
| the StatusLogger, ContextSelector, and all LoggerContexts, |
| LoggerConfigs and Appenders are instrumented with MBeans. |
| To disable JMX completely, and prevent these MBeans from being created, |
| specify system property <code>log4j2.disableJmx</code> to <code>true</code> when you start |
| the Java VM. |
| </p> |
| <section> |
| <h3><a name="Local_Monitoring_and_Management"></a>Local Monitoring and Management</h3> |
| <a name="Local"></a> |
| |
| <p>To perform local monitoring you don't need to specify any system |
| properties. The JConsole tool that is included in the Java JDK can be |
| used to monitor your application. Start JConsole by typing |
| <code>$JAVA_HOME/bin/jconsole</code> in a command shell. |
| For more details, see Oracle's documentation on |
| <a class="externalLink" href="https://docs.oracle.com/javase/7/docs/technotes/guides/management/jconsole.html">how to use JConsole</a>.</p> |
| </section> |
| <section> |
| <h3><a name="Remote_Monitoring_and_Management"></a>Remote Monitoring and Management</h3> |
| <a name="Remote"></a> |
| |
| <p>To enable monitoring and management from remote systems, set the following system property when starting the Java VM. |
| </p> |
| <p> |
| <code>com.sun.management.jmxremote.port=portNum</code> |
| </p> |
| <p> |
| In the property above, <code>portNum</code> is the port number through |
| which you want to enable JMX RMI connections. |
| </p> |
| <p> |
| For more details, see Oracle's documentation on |
| <a class="externalLink" href="https://docs.oracle.com/javase/7/docs/technotes/guides/management/agent.html#gdenl">Remote |
| Monitoring and Management</a>.</p> |
| </section> |
| <section> |
| <h3><a name="RMI_impact_on_Garbage_Collection"></a>RMI impact on Garbage Collection</h3> |
| <a name="RMI_GC"></a> |
| |
| <p> |
| Be aware that RMI by default triggers a full GC every hour. |
| See the <a class="externalLink" href="https://docs.oracle.com/javase/7/docs/technotes/guides/rmi/sunrmiproperties.html">Oracle |
| documentation</a> for the <code>sun.rmi.dgc.server.gcInterval</code> and <code>sun.rmi.dgc.client.gcInterval</code> properties. |
| The default value of both properties is 3600000 milliseconds (one hour). Before Java 6, it was one minute. |
| </p> |
| <p> |
| The two sun.rmi arguments reflect whether your JVM is running in server or client mode. |
| If you want to modify the GC interval time it may be best to specify both properties to ensure the argument is picked up by the JVM. |
| </p> |
| <p> |
| An alternative may be to disable explicit calls to <code>System.gc()</code> altogether with |
| <code>-XX:+DisableExplicitGC</code>, or (if you are using the CMS or G1 collector) |
| add <code>-XX:+ExplicitGCInvokesConcurrent</code> to ensure the full GCs are done |
| concurrently in parallel with your application instead of forcing a stop-the-world collection. |
| </p> |
| </section> |
| </section> |
| <section> |
| <h2><a name="Log4j_Instrumented_Components"></a>Log4j Instrumented Components</h2> |
| <a name="Log4j_MBeans"></a> |
| |
| <p>The best way to find out which methods and attributes of the various |
| Log4j components are accessible via JMX is to look at the |
| <code>org.apache.logging.log4j.core.jmx</code> package contents in the |
| <code>log4j-core</code> artifact or by exploring directly in JConsole.</p> |
| |
| <p>The screenshot below shows the Log4j MBeans in JConsole.</p> |
| |
| <p><img src="../images/jmx-jconsole-mbeans.png" alt="JConsole screenshot of the MBeans tab" /></p> |
| </section> |
| <section> |
| <h2><a name="Client_GUI"></a>Client GUI</h2> |
| <a name="ClientGUI"></a> |
| |
| <p> |
| <a class="externalLink" href="https://github.com/apache/logging-log4j-jmx-gui">The Apache Log4j JMX GUI</a> is a basic client GUI that can be used to monitor the <code>StatusLogger</code> output and to remotely modify the Log4j configuration. |
| The client GUI can be run as a stand-alone application or as a JConsole plug-in. |
| </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> |
