| <!DOCTYPE html> |
| <!-- |
| | Generated by Apache Maven Doxia Site Renderer 1.9.1 from net.sourceforge.maven-taglib:maven-taglib-plugin:2.4:tagreference at 2020-05-10 |
| | Rendered using Apache Maven Fluido Skin 1.8 |
| --> |
| <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 1.9.1" /> |
| <title>Log4j Tag Library – Tag reference report.</title> |
| <link rel="stylesheet" href="./css/apache-maven-fluido-1.8.min.css" /> |
| <link rel="stylesheet" href="./css/site.css" /> |
| <link rel="stylesheet" href="./css/print.css" media="print" /> |
| <script src="./js/apache-maven-fluido-1.8.min.js"></script> |
| </head> |
| <body class="topBarDisabled"> |
| <div class="container-fluid"> |
| <header> |
| <div id="banner"> |
| <div class="pull-left"><a href="http://logging.apache.org" id="bannerLeft"><img src="../images/ls-logo.jpg" alt=""/></a></div> |
| <div class="pull-right"><a href="http://logging.apache.org/log4j/2.x" id="bannerRight"><img src="../images/logo.png" alt=""/></a></div> |
| <div class="clear"><hr/></div> |
| </div> |
| |
| <div id="breadcrumbs"> |
| <ul class="breadcrumb"> |
| <li id="publishDate">Last Published: 2020-05-10<span class="divider">|</span> |
| </li> |
| <li id="projectVersion">Version: 2.13.3</li> |
| <li class="pull-right"><span class="divider">|</span> |
| <a href="../index.html" title="Log4j">Log4j</a></li> |
| <li class="pull-right"><span class="divider">|</span> |
| <a href="http://logging.apache.org/" class="externalLink" title="Logging Services">Logging Services</a></li> |
| <li class="pull-right"><span class="divider">|</span> |
| <a href="http://www.apache.org/" class="externalLink" title="Apache">Apache</a></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="https://analysis.apache.org/dashboard/index/org.apache.logging.log4j:log4j" class="externalLink" title="Sonar">Sonar</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" 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="../javadoc.html" title="Javadoc"><span class="icon-chevron-right"></span>Javadoc</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="../runtime-dependencies.html" title="Runtime Dependencies"><span class="none"></span>Runtime Dependencies</a></li> |
| <li><a href="../changelog.html" title="Changelog"><span class="none"></span>Changelog</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="none"></span>Security</a></li> |
| <li><a href="../support.html" title="Support"><span class="none"></span>Support</a></li> |
| <li><a href="../thanks.html" title="Thanks"><span class="none"></span>Thanks</a></li> |
| <li class="nav-header"><img class="imageLink" src="img/glyphicons/pencil.png" alt="For Contributors" border="0"/> For Contributors</li> |
| <li><a href="../build.html" title="Building Log4j from Source"><span class="none"></span>Building Log4j from Source</a></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/book.png" alt="Manual" 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/compatibility.html" title="Log4j 1.x Compatibility"><span class="none"></span>Log4j 1.x Compatibility</a></li> |
| <li><a href="../manual/migration.html" title="Log4j 1.x Migration"><span class="none"></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="../manual/scala-api.html" 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/tag.png" alt="Related Projects" border="0"/> Related Projects</li> |
| <li><a href="http://logging.apache.org/log4j/scala/index.html" class="externalLink" title="Log4j-Scala"><span class="none"></span>Log4j-Scala</a></li> |
| <li class="nav-header"><img class="imageLink" src="img/glyphicons/link.png" alt="Legacy Sites" border="0"/> Legacy Sites</li> |
| <li><a href="http://logging.apache.org/log4j/1.2/" class="externalLink" title="Log4j 1.2 - End of Life"><span class="none"></span>Log4j 1.2 - End of Life</a></li> |
| <li><a href="http://logging.apache.org/log4j/log4j-2.3/" class="externalLink" title="Log4j 2.3 - Java 6"><span class="none"></span>Log4j 2.3 - Java 6</a></li> |
| <li><a href="http://logging.apache.org/log4j/log4j-2.12.1" class="externalLink" title="Log4j 2.12.1 - Java 7"><span class="none"></span>Log4j 2.12.1 - Java 7</a></li> |
| <li class="nav-header"><img class="imageLink" src="img/glyphicons/cog.png" alt="Components" border="0"/> Components</li> |
| <li><a href="../log4j-api/index.html" title="API"><span class="none"></span>API</a></li> |
| <li><a href="../log4j-core/index.html" title="Implementation"><span class="none"></span>Implementation</a></li> |
| <li><a href="../log4j-jcl/index.html" title="Commons Logging Bridge"><span class="none"></span>Commons Logging Bridge</a></li> |
| <li><a href="../log4j-1.2-api/index.html" title="Log4j 1.2 API"><span class="none"></span>Log4j 1.2 API</a></li> |
| <li><a href="../log4j-slf4j-impl/index.html" title="SLF4J Binding"><span class="none"></span>SLF4J Binding</a></li> |
| <li><a href="../log4j-jul/index.html" title="JUL Adapter"><span class="none"></span>JUL Adapter</a></li> |
| <li><a href="../log4j-jpl/index.html" title="JDK Platform Logger"><span class="none"></span>JDK Platform Logger</a></li> |
| <li><a href="../log4j-to-slf4j/index.html" title="Log4j 2 to SLF4J Adapter"><span class="none"></span>Log4j 2 to SLF4J Adapter</a></li> |
| <li><a href="../log4j-flume-ng/index.html" title="Apache Flume Appender"><span class="none"></span>Apache Flume Appender</a></li> |
| <li><a href="../log4j-taglib/index.html" title="Log4j Tag Library"><span class="none"></span>Log4j Tag Library</a></li> |
| <li><a href="../log4j-jmx-gui/index.html" title="Log4j JMX GUI"><span class="none"></span>Log4j JMX GUI</a></li> |
| <li><a href="../log4j-web/index.html" title="Log4j Web Application Support"><span class="none"></span>Log4j Web Application Support</a></li> |
| <li><a href="../log4j-appserver/index.html" title="Log4j Application Server Integration"><span class="none"></span>Log4j Application Server Integration</a></li> |
| <li><a href="../log4j-couchdb/index.html" title="Log4j CouchDB appender"><span class="none"></span>Log4j CouchDB appender</a></li> |
| <li><a href="../log4j-mongodb2/index.html" title="Log4j MongoDB2 appender"><span class="none"></span>Log4j MongoDB2 appender</a></li> |
| <li><a href="../log4j-mongodb3/index.html" title="Log4j MongoDB3 appender"><span class="none"></span>Log4j MongoDB3 appender</a></li> |
| <li><a href="../log4j-cassandra/index.html" title="Log4j Cassandra appender"><span class="none"></span>Log4j Cassandra appender</a></li> |
| <li><a href="../log4j-iostreams/index.html" title="Log4j IO Streams"><span class="none"></span>Log4j IO Streams</a></li> |
| <li><a href="../log4j-liquibase/index.html" title="Log4j Liquibase Binding"><span class="none"></span>Log4j Liquibase Binding</a></li> |
| <li><a href="../log4j-docker/index.html" title="Log4j Docker Support"><span class="none"></span>Log4j Docker Support</a></li> |
| <li><a href="../log4j-spring-cloud-config/log4j-spring-cloud-config-client/index.html" title="Log4j Spring Cloud Config Client"><span class="none"></span>Log4j Spring Cloud Config Client</a></li> |
| <li class="nav-header">Project Documentation</li> |
| <li><a href="project-info.html" title="Project Information"><span class="icon-chevron-right"></span>Project Information</a></li> |
| <li><a href="project-reports.html" title="Project Reports"><span class="icon-chevron-down"></span>Project Reports</a> |
| <ul class="nav nav-list"> |
| <li><a href="jira-report.html" title="JIRA Report"><span class="none"></span>JIRA Report</a></li> |
| <li><a href="rat-report.html" title="Rat Report"><span class="none"></span>Rat Report</a></li> |
| <li><a href="revapi-report.html" title="API Change Analysis"><span class="none"></span>API Change Analysis</a></li> |
| <li><a href="checkstyle.html" title="Checkstyle"><span class="none"></span>Checkstyle</a></li> |
| <li><a href="apidocs/index.html" title="Javadoc"><span class="none"></span>Javadoc</a></li> |
| <li><a href="findbugs.html" title="FindBugs"><span class="none"></span>FindBugs</a></li> |
| <li><a href="xref/index.html" title="Source Xref"><span class="none"></span>Source Xref</a></li> |
| <li class="active"><a href="#"><span class="none"></span>Tag reference</a></li> |
| <li><a href="tlddoc/index.html" title="Taglibdoc documentation"><span class="none"></span>Taglibdoc documentation</a></li> |
| <li><a href="taglibvalidation.html" title="Tag library validation"><span class="none"></span>Tag library validation</a></li> |
| </ul></li> |
| <li class="nav-header"><img class="imageLink" src="icon-info-sign" alt="Log4j Project Information" border="0"/> Log4j Project Information</li> |
| <li><a href="../dependencies.html" title="Dependencies"><span class="none"></span>Dependencies</a></li> |
| <li><a href="../dependency-convergence.html" title="Dependency Convergence"><span class="none"></span>Dependency Convergence</a></li> |
| <li><a href="../dependency-management.html" title="Dependency Management"><span class="none"></span>Dependency Management</a></li> |
| <li><a href="../team-list.html" title="Project Team"><span class="none"></span>Project Team</a></li> |
| <li><a href="../mail-lists.html" title="Mailing Lists"><span class="none"></span>Mailing Lists</a></li> |
| <li><a href="../issue-tracking.html" title="Issue Tracking"><span class="none"></span>Issue Tracking</a></li> |
| <li><a href="../license.html" title="Project License"><span class="none"></span>Project License</a></li> |
| <li><a href="../source-repository.html" title="Source Repository"><span class="none"></span>Source Repository</a></li> |
| <li><a href="../project-summary.html" title="Project Summary"><span class="none"></span>Project Summary</a></li> |
| <li class="nav-header"><img class="imageLink" src="icon-cog" alt="Log4j Project Reports" border="0"/> Log4j Project Reports</li> |
| <li><a href="../changes-report.html" title="Changes Report"><span class="none"></span>Changes Report</a></li> |
| <li><a href="../jira-report.html" title="JIRA Report"><span class="none"></span>JIRA Report</a></li> |
| <li><a href="../surefire-report.html" title="Surefire Report"><span class="none"></span>Surefire Report</a></li> |
| <li><a href="../rat-report.html" title="RAT Report"><span class="none"></span>RAT Report</a></li> |
| </ul> |
| </nav> |
| <div class="well sidebar-nav"> |
| <hr /> |
| <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="Tag_reference_sheet"></a>Tag reference sheet</h2> |
| <p>Tag library reference for the following tag libraries:</p> |
| <ul> |
| <li><a href="#log.tld">Log4j 2 Tag Library (log.tld)</a> - uri:http://logging.apache.org/log4j/tld/log</li></ul></section><a name="log.tld"></a><section> |
| <h2><a name="Log4j_2_Tag_Library_-_version_1.0"></a>Log4j 2 Tag Library - version 1.0</h2> |
| <p>The Log4j Log Tag Library creates the capability of inserting log |
| statements in JSPs without the use of Java scripting. It uses the standard Log4j 2 API to log |
| messages according to your Log4j configuration. You can learn more about Log4j 2 on the |
| <a href="http://logging.apache.org/log4j/2.x/">Log4j 2</a> website. |
| |
| This tag library is based on the Jakarta Commons Log Taglib by Joseph Ottinger and James |
| Strachan. For the most part, logging tags written against Jakarta Commons Log Taglib should |
| work against this library as well. However, the "category" attribute from Jakarta has become |
| the "logger" attribute in this library. |
| |
| In accordance with the org.apache.logging.log4j.Logger API, this tag library has tags to |
| support the following logging calls: "catching", "entry", "exit", "log", "trace", "debug", |
| "info", "warn", "error", and "fatal". The "trace" tag was not supported in Jakarta Commons Log |
| Taglib. The "setLogger", "catching", "entry", and "trace" tags are new to this library. This |
| tag library also supports the conditional tag "ifEnabled" (new) and troubleshooting tag "dump" |
| (existed in Jakarta Commons Log Taglib). |
| |
| By default, this tag library uses a different Logger for each JSP named after the JSP ID. |
| You can customize the Logger in any of the logging tags or the "ifEnabled" tag with the |
| "logger" attribute. You can also use the "setLogger" tag to specify the Logger that should apply |
| for the rest of a JSP's execution. If the "setLogger" tag comes before any other logging tags in |
| a JSP, the default Logger for that JSP will not be created, but instead the specified logger is |
| the only one that will be used. |
| |
| Every effort was made to optimize these tags and ensure decent performance, but users of |
| this library should keep in mind that the creation and execution of JSP tags adds significant |
| overhead to the standard Log4j method calls. While the "trace", "debug", and "info" options are |
| available in this library, their uses are not nanosecond order of magnitude with logging off |
| that users may be used to with standard Log4j method calls. Therefore, they should be used |
| sparingly. Use of the "ifEnabled" tag does not improve this performance; this tag is available |
| to conditionally evaluate other actions in addition to logging actions.</p> |
| <p><b>Namespace definition:</b> xmlns:log="http://logging.apache.org/log4j/tld/log"</p> |
| <p><b>Tags</b></p> |
| <ul> |
| <li><a href="#log:catching">catching</a> Equivalent of org</li> |
| <li><a href="#log:debug">debug</a> Equivalent of org</li> |
| <li><a href="#log:dump">dump</a> Displays all variables bound to the specified scope</li> |
| <li><a href="#log:entry">entry</a> Equivalent of org</li> |
| <li><a href="#log:error">error</a> Equivalent of org</li> |
| <li><a href="#log:exit">exit</a> Equivalent of org</li> |
| <li><a href="#log:fatal">fatal</a> Equivalent of org</li> |
| <li><a href="#log:ifEnabled">ifEnabled</a> Conditional tag that evaluates its body only if the specified log level and |
| marker are enabled</li> |
| <li><a href="#log:info">info</a> Equivalent of org</li> |
| <li><a href="#log:log">log</a> Equivalent of org</li> |
| <li><a href="#log:setLogger">setLogger</a> Sets the default Logger to use for the rest of this JSP's execution OR exports |
| an org</li> |
| <li><a href="#log:trace">trace</a> Equivalent of org</li> |
| <li><a href="#log:warn">warn</a> Equivalent of org</li></ul> |
| <p>Required attributes are marked with a<b>*</b></p><a name="log:catching"></a><section> |
| <h3><a name="a.3Clog:catching.3E"></a><log:catching></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#catching().</p> |
| <p>Can contain:empty</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <c:catch var="myException"> |
| <%= 5 / 0 %> |
| </c:catch> |
| <c:if test="${myException != null}"> |
| <log:catching exception="${myException}" /> |
| </c:if> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="a"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="b"> |
| <td><b>exception*</b></td> |
| <td>The exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>level</td> |
| <td>The name of any valid level (TRACE, DEBUG, INFO, etc.) or an actual Level |
| instance to log this at. This value is case-insensitive and defaults to ERROR for this |
| tag.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr></table></section></section><a name="log:debug"></a><section> |
| <h3><a name="a.3Clog:debug.3E"></a><log:debug></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#debug(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <log:debug message="Log this message." /> |
| <log:debug logger="com.foo.bar" message="${objectToLog}" exception="${exception}" |
| marker="${marker}" /> |
| <log:debug logger="com.foo.bar" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:debug> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="a"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="b"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="a"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></section></section><a name="log:dump"></a><section> |
| <h3><a name="a.3Clog:dump.3E"></a><log:dump></h3> |
| <p>Displays all variables bound to the specified scope.</p> |
| <p>Can contain:empty</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <log:dump scope="page" /> |
| <log:dump scope="request" /> |
| <log:dump scope="session" /> |
| <log:dump scope="application" /> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td><b>scope*</b></td> |
| <td>Either "page," "request," "session," or "application," the scope whose bound |
| variables should be dumped onto the page inline.</td> |
| <td>String</td></tr></table></section></section><a name="log:entry"></a><section> |
| <h3><a name="a.3Clog:entry.3E"></a><log:entry></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#entry(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values |
| will be logged with this entry (TRACE) statement. The attribute names will be |
| ignored.</p> |
| <p>Can contain:empty</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <log:entry /> |
| <log:entry logger="com.foo.bar" /> |
| <log:entry arg1="${value1}" arg2="${value2}" /> |
| <log:entry logger="${myLogger}" argA="${value1}" argB="${value2}" /> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr></table></section></section><a name="log:error"></a><section> |
| <h3><a name="a.3Clog:error.3E"></a><log:error></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#error(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <log:error message="Log this message." /> |
| <log:error logger="com.foo.bar" message="${objectToLog}" exception="${exception}" |
| marker="${marker}" /> |
| <log:error logger="com.foo.bar" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:error> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="b"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></section></section><a name="log:exit"></a><section> |
| <h3><a name="a.3Clog:exit.3E"></a><log:exit></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#exit().</p> |
| <p>Can contain:empty</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <log:exit /> |
| <log:exit logger="com.foo.bar" /> |
| <log:exit result="${value}" /> |
| <log:exit logger="${myLogger}" result="${value}" /> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="a"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="b"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>result</td> |
| <td>An optional object to log with the exit (TRACE) statement.</td> |
| <td>String</td></tr></table></section></section><a name="log:fatal"></a><section> |
| <h3><a name="a.3Clog:fatal.3E"></a><log:fatal></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#fatal(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <log:fatal message="Log this message." /> |
| <log:fatal logger="com.foo.bar" message="${objectToLog}" exception="${exception}" |
| marker="${marker}" /> |
| <log:fatal logger="com.foo.bar" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:fatal> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="b"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></section></section><a name="log:ifEnabled"></a><section> |
| <h3><a name="a.3Clog:ifEnabled.3E"></a><log:ifEnabled></h3> |
| <p>Conditional tag that evaluates its body only if the specified log level and |
| marker are enabled.</p> |
| <p>Can contain:JSP</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <log:ifEnabled level="info"> |
| Evaluate this content |
| </log:ifEnabled> |
| |
| <log:ifEnabled logger="com.foo.bar" level="INFO" marker="${marker}"> |
| Evaluate this content |
| </log:ifEnabled> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="a"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="b"> |
| <td><b>level*</b></td> |
| <td>The name of any valid Level (TRACE, DEBUG, INFO, etc.) or an actual Level |
| instance to check whether it is enabled. This value is case-insensitive.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>marker</td> |
| <td>Marker data to include in the enabled check.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr></table></section></section><a name="log:info"></a><section> |
| <h3><a name="a.3Clog:info.3E"></a><log:info></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#info(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <log:info message="Log this message." /> |
| <log:info logger="com.foo.bar" message="${objectToLog}" exception="${exception}" |
| marker="${marker}" /> |
| <log:info logger="com.foo.bar" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:info> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="a"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="b"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="a"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></section></section><a name="log:log"></a><section> |
| <h3><a name="a.3Clog:log.3E"></a><log:log></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#log(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <log:log level="warn" message="Log this message." /> |
| <log:log logger="com.foo.bar" level="ERROR" message="${objectToLog}" |
| exception="${exception}" marker="${marker}" /> |
| <log:log logger="com.foo.bar" level="info" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:log> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td><b>level*</b></td> |
| <td>The name of any valid level (TRACE, DEBUG, INFO, etc.) or an actual Level |
| instance to log this at. This value is case-insensitive.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="a"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></section></section><a name="log:setLogger"></a><section> |
| <h3><a name="a.3Clog:setLogger.3E"></a><log:setLogger></h3> |
| <p>Sets the default Logger to use for the rest of this JSP's execution OR exports |
| an org.apache.logging.log4j.Logger instance as the specified EL variable. The "value" |
| attribute specifies either the String name of a Logger to create or an actual Logger instance. |
| By default, Loggers are constructed and assigned the standard |
| org.apache.logging.log4j.message.ParameterizedMessageFactory. The optional "factory" attribute |
| can be used to override the default message factory.</p> |
| <p>Can contain:empty</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <log:logger value="com.foo.bar" /> |
| <log:logger value="com.bar.foo" var="myLogger" /> |
| <log:debug message="This should log with com.foo.bar." /> |
| <log:debug logger="${myLogger}" message="This should log with com.bar.foo." /> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td>factory</td> |
| <td>Specify this optional tag to provide a message factory other than the default |
| ParameterizedMessageFactory message factory to use for the Logger. If the Logger has already |
| been created with a different message factory, this will be ignored. Using this attribute |
| makes no sense if the "value" attribute's value is an actual Logger instance, since its |
| message factory cannot be changed.</td> |
| <td>org.apache.logging.log4j.message.MessageFactory</td></tr> |
| <tr class="b"> |
| <td><b>logger*</b></td> |
| <td>The name or instance of the Logger to set as the JSP's default Logger or |
| the name of the Logger to export as the specified EL variable.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>scope</td> |
| <td>Either "page," "request," "session," or "application," the optional scope that |
| the EL variable should be exported to (defaults to "page").</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>var</td> |
| <td>The optional name of the EL variable to export this Logger as. Using this |
| attribute makes no sense if the "value" attribute's value is an actual Logger instance. |
| That would result in an existing Logger on the scope being re-added to the |
| scope.</td> |
| <td>String</td></tr></table></section></section><a name="log:trace"></a><section> |
| <h3><a name="a.3Clog:trace.3E"></a><log:trace></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#trace(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <log:trace message="Log this message." /> |
| <log:trace logger="com.foo.bar" message="${objectToLog}" exception="${exception}" |
| marker="${marker}" /> |
| <log:trace logger="com.foo.bar" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:trace> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="a"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="b"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="a"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></section></section><a name="log:warn"></a><section> |
| <h3><a name="a.3Clog:warn.3E"></a><log:warn></h3> |
| <p>Equivalent of org.apache.logging.log4j.Logger#warn(). This tag has dynamic |
| attributes enabled. You may specify any number of arbitrary attributes whose values will be |
| substituted in the String message. The "message" must be a String for this to work correctly. |
| See the Log4j 2 manual for more information about message parameters and substitution. Only |
| attribute values are used; attribute names are ignored.</p> |
| <p>Can contain:JSP</p><section> |
| <h4><a name="Example"></a>Example</h4> |
| <div class="source"><pre class="prettyprint"> |
| <log:warn message="Log this message." /> |
| <log:warn logger="com.foo.bar" message="${objectToLog}" exception="${exception}" |
| marker="${marker}" /> |
| <log:warn logger="com.foo.bar" exception="${exception}" marker="${marker}"> |
| Log this message |
| </log:warn> |
| </pre></div></section><section> |
| <h4><a name="Attributes"></a>Attributes</h4> |
| <table border="0" class="table table-striped"> |
| <tr class="b"> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th></tr> |
| <tr class="a"> |
| <td>exception</td> |
| <td>Optional exception that should be logged.</td> |
| <td>String</td></tr> |
| <tr class="b"> |
| <td>logger</td> |
| <td>The name or instance of the Logger to use to override the default Logger |
| for this JSP.</td> |
| <td>String</td></tr> |
| <tr class="a"> |
| <td>marker</td> |
| <td>Optional marker data to include in this logging event.</td> |
| <td>org.apache.logging.log4j.Marker</td></tr> |
| <tr class="b"> |
| <td>message</td> |
| <td>The message that should be logged. May be a String, Object, or |
| org.apache.logging.log4j.message.Message. Either this attribute or body content are |
| required.</td> |
| <td>String</td></tr></table></section></section></section><!-- PB --> |
| </main> |
| </div> |
| </div> |
| <hr/> |
| <footer> |
| <div class="container-fluid"> |
| <div class="row-fluid"> |
| <p align="center">Copyright © 1999-2020 <a class="external" href="http://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> |
| </body> |
| </html> |