content/log4j/2.13.0/log4j-taglib/tlddoc/log/tld-summary.html - logging-site - Git at Google

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           (Apache Log4j Tag Library Tag library documentation)
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                 &nbsp;<a HREF="../index.html" TARGET="_top"><b>FRAMES</b></a>&nbsp;
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                 <script></script>
 <noscript>
 <a HREF="../alltags-noframe.html" TARGET=""><b>All Tags</b></a>
 </noscript>
 </font></td>
 </tr>
 </table>
 <hr>
 <h2>Log4j 2 Tag Library</h2>
 <hr>
 <b>Standard Syntax:</b>
 <br>
 <code>
                 &nbsp;&nbsp;&nbsp;&nbsp;

                     &lt;%@ taglib prefix="log" uri="http://logging.apache.org/log4j/tld/log" %&gt;<br>
 </code>
 <br>
 <b>XML Syntax:</b>
 <br>
 <code>
                 &nbsp;&nbsp;&nbsp;&nbsp;

                     &lt;anyxmlelement xmlns:log="http://logging.apache.org/log4j/tld/log" /&gt;<br>
 </code>
 <hr>
 <pre>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.</pre>
 <p></p>
 <table border="1" cellpadding="3" cellspacing="0" width="100%">
 <tr bgcolor="#CCCCFF" class="TableHeadingColor">
 <td colspan="2"><font size="+2"><b>Tag Library Information</b></font></td>
 </tr>
 <tr>
 <td>Display Name</td><td>Log4j 2 Tag Library</td>
 </tr>
 <tr>
 <td>Version</td><td>1.0</td>
 </tr>
 <tr>
 <td>Short Name</td><td>log</td>
 </tr>
 <tr>
 <td>URI</td><td>http://logging.apache.org/log4j/tld/log</td>
 </tr>
 </table>
             &nbsp;
             <p></p>
 <table border="1" cellpadding="3" cellspacing="0" width="100%">
 <tr bgcolor="#CCCCFF" class="TableHeadingColor">
 <td colspan="2"><font size="+2"><b>Tag Summary</b></font></td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="setLogger.html">setLogger</a></b></td><td>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.</td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="ifEnabled.html">ifEnabled</a></b></td><td>Conditional tag that evaluates its body only if the specified log level and
       marker are enabled.</td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="catching.html">catching</a></b></td><td>Equivalent of org.apache.logging.log4j.Logger#catching().</td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="entry.html">entry</a></b></td><td>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.</td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="exit.html">exit</a></b></td><td>Equivalent of org.apache.logging.log4j.Logger#exit().</td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="log.html">log</a></b></td><td>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.</td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="trace.html">trace</a></b></td><td>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.</td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="debug.html">debug</a></b></td><td>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.</td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="info.html">info</a></b></td><td>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.</td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="warn.html">warn</a></b></td><td>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.</td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="error.html">error</a></b></td><td>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.</td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="fatal.html">fatal</a></b></td><td>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.</td>
 </tr>
 <tr bgcolor="white" class="TableRowColor">
 <td width="15%"><b><a href="dump.html">dump</a></b></td><td>Displays all variables bound to the specified scope.</td>
 </tr>
 </table>
               &nbsp;
               <p></p>
 <a name="navbar_bottom"></a>
 <table border="0" width="100%" cellpadding="1" cellspacing="0">
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 <td COLSPAN="3" BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><a NAME="navbar_bottom_firstrow"></a>
 <table BORDER="0" CELLPADDING="0" CELLSPACING="3">
 <tr ALIGN="center" VALIGN="top">
 <td BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    &nbsp;<a href="../overview-summary.html"><font CLASS="NavBarFont1"><b>Overview</b></font></a>&nbsp;</td><td BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev">    &nbsp;<font CLASS="NavBarFont1Rev">&nbsp;Library&nbsp;</font>&nbsp;</td><td BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><font CLASS="NavBarFont1">&nbsp;Tag&nbsp;</font></td><td BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    &nbsp;<a HREF="../help-doc.html"><font CLASS="NavBarFont1"><b>Help</b></font></a>&nbsp;</td>
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                 &nbsp;<a HREF="../index.html" TARGET="_top"><b>FRAMES</b></a>&nbsp;
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                 <script></script>
 <noscript>
 <a HREF="../alltags-noframe.html" TARGET=""><b>All Tags</b></a>
 </noscript>
 </font></td>
 </tr>
 </table>
 <hr>
 <small><i>
             Java, JSP, and JavaServer Pages are trademarks or registered
             trademarks of Sun Microsystems, Inc. in the US and other countries.
             Copyright 2002-3 Sun Microsystems, Inc.
             4150 Network Circle
             Santa Clara, CA 95054, U.S.A.
             All Rights Reserved.
             </i></small>
 </body>
 </html>
	<html xmlns:javaee="http://java.sun.com/xml/ns/javaee" xmlns:fo="http://www.w3.org/1999/XSL/Format">
	<head>
	<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
	<title>Log4j 2 Tag Library
	(Apache Log4j Tag Library Tag library documentation)
	</title>
	<link rel="stylesheet" type="text/css" href="../stylesheet.css" title="styie">
	</head>
	<script>
	function asd()
	{
	parent.document.title="Log4j 2 Tag Library (Apache Log4j Tag Library Tag library documentation)";
	}
	</script>
	<body bgcolor="white" onload="asd();">
	<a name="navbar_top"></a>
	<table border="0" width="100%" cellpadding="1" cellspacing="0">
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	<a HREF="../index.html" TARGET="_top"><b>FRAMES</b></a>
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	<script></script>
	<noscript>
	<a HREF="../alltags-noframe.html" TARGET=""><b>All Tags</b></a>
	</noscript>
	</font></td>
	</tr>
	</table>
	<hr>
	<h2>Log4j 2 Tag Library</h2>
	<hr>
	<b>Standard Syntax:</b>
	<br>
	<code>


	<%@ taglib prefix="log" uri="http://logging.apache.org/log4j/tld/log" %><br>
	</code>
	<br>
	<b>XML Syntax:</b>
	<br>
	<code>


	<anyxmlelement xmlns:log="http://logging.apache.org/log4j/tld/log" /><br>
	</code>
	<hr>
	<pre>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.</pre>
	<p></p>
	<table border="1" cellpadding="3" cellspacing="0" width="100%">
	<tr bgcolor="#CCCCFF" class="TableHeadingColor">
	<td colspan="2"><font size="+2"><b>Tag Library Information</b></font></td>
	</tr>
	<tr>
	<td>Display Name</td><td>Log4j 2 Tag Library</td>
	</tr>
	<tr>
	<td>Version</td><td>1.0</td>
	</tr>
	<tr>
	<td>Short Name</td><td>log</td>
	</tr>
	<tr>
	<td>URI</td><td>http://logging.apache.org/log4j/tld/log</td>
	</tr>
	</table>

	<p></p>
	<table border="1" cellpadding="3" cellspacing="0" width="100%">
	<tr bgcolor="#CCCCFF" class="TableHeadingColor">
	<td colspan="2"><font size="+2"><b>Tag Summary</b></font></td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="setLogger.html">setLogger</a></b></td><td>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.</td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="ifEnabled.html">ifEnabled</a></b></td><td>Conditional tag that evaluates its body only if the specified log level and
	marker are enabled.</td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="catching.html">catching</a></b></td><td>Equivalent of org.apache.logging.log4j.Logger#catching().</td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="entry.html">entry</a></b></td><td>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.</td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="exit.html">exit</a></b></td><td>Equivalent of org.apache.logging.log4j.Logger#exit().</td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="log.html">log</a></b></td><td>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.</td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="trace.html">trace</a></b></td><td>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.</td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="debug.html">debug</a></b></td><td>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.</td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="info.html">info</a></b></td><td>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.</td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="warn.html">warn</a></b></td><td>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.</td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="error.html">error</a></b></td><td>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.</td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="fatal.html">fatal</a></b></td><td>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.</td>
	</tr>
	<tr bgcolor="white" class="TableRowColor">
	<td width="15%"><b><a href="dump.html">dump</a></b></td><td>Displays all variables bound to the specified scope.</td>
	</tr>
	</table>

	<p></p>
	<a name="navbar_bottom"></a>
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	<table BORDER="0" CELLPADDING="0" CELLSPACING="3">
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	<script></script>
	<noscript>
	<a HREF="../alltags-noframe.html" TARGET=""><b>All Tags</b></a>
	</noscript>
	</font></td>
	</tr>
	</table>
	<hr>
	<small><i>
	Java, JSP, and JavaServer Pages are trademarks or registered
	trademarks of Sun Microsystems, Inc. in the US and other countries.
	Copyright 2002-3 Sun Microsystems, Inc.
	4150 Network Circle
	Santa Clara, CA 95054, U.S.A.
	All Rights Reserved.
	</i></small>
	</body>
	</html>