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Logger (Log4j Version 1.2.16)
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<b>Log4j 1.2.16</b><!-- 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. --></EM>
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SUMMARY: NESTED | <A HREF="#fields_inherited_from_class_org.apache.log4j.Category">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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org.apache.log4j</FONT>
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Class Logger</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../org/apache/log4j/Category.html" title="class in org.apache.log4j">org.apache.log4j.Category</A>
<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>org.apache.log4j.Logger</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../org/apache/log4j/spi/AppenderAttachable.html" title="interface in org.apache.log4j.spi">AppenderAttachable</A></DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../org/apache/log4j/spi/NOPLogger.html" title="class in org.apache.log4j.spi">NOPLogger</A>, <A HREF="../../../org/apache/log4j/spi/RootCategory.html" title="class in org.apache.log4j.spi">RootCategory</A>, <A HREF="../../../org/apache/log4j/spi/RootLogger.html" title="class in org.apache.log4j.spi">RootLogger</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>Logger</B><DT>extends <A HREF="../../../org/apache/log4j/Category.html" title="class in org.apache.log4j">Category</A></DL>
</PRE>
<P>
This is the central class in the log4j package. Most logging
operations, except configuration, are done through this class.
<P>
<P>
<DL>
<DT><B>Since:</B></DT>
<DD>log4j 1.2</DD>
<DT><B>Author:</B></DT>
<DD>Ceki Gülcü</DD>
</DL>
<HR>
<P>
<!-- =========== FIELD SUMMARY =========== -->
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<B>Field Summary</B></FONT></TH>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TH ALIGN="left"><B>Fields inherited from class org.apache.log4j.<A HREF="../../../org/apache/log4j/Category.html" title="class in org.apache.log4j">Category</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../org/apache/log4j/Category.html#additive">additive</A>, <A HREF="../../../org/apache/log4j/Category.html#level">level</A>, <A HREF="../../../org/apache/log4j/Category.html#name">name</A>, <A HREF="../../../org/apache/log4j/Category.html#parent">parent</A>, <A HREF="../../../org/apache/log4j/Category.html#repository">repository</A>, <A HREF="../../../org/apache/log4j/Category.html#resourceBundle">resourceBundle</A></CODE></TD>
</TR>
</TABLE>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<A NAME="constructor_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<B>Constructor Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected </CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Logger.html#Logger(java.lang.String)">Logger</A></B>(java.lang.String name)</CODE>
<BR>
</TD>
</TR>
</TABLE>
<!-- ========== METHOD SUMMARY =========== -->
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<B>Method Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../org/apache/log4j/Logger.html" title="class in org.apache.log4j">Logger</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Logger.html#getLogger(java.lang.Class)">getLogger</A></B>(java.lang.Class clazz)</CODE>
<BR>
Shorthand for <code>getLogger(clazz.getName())</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../org/apache/log4j/Logger.html" title="class in org.apache.log4j">Logger</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Logger.html#getLogger(java.lang.String)">getLogger</A></B>(java.lang.String name)</CODE>
<BR>
Retrieve a logger named according to the value of the
<code>name</code> parameter.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../org/apache/log4j/Logger.html" title="class in org.apache.log4j">Logger</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Logger.html#getLogger(java.lang.String, org.apache.log4j.spi.LoggerFactory)">getLogger</A></B>(java.lang.String name,
<A HREF="../../../org/apache/log4j/spi/LoggerFactory.html" title="interface in org.apache.log4j.spi">LoggerFactory</A> factory)</CODE>
<BR>
Like <A HREF="../../../org/apache/log4j/Logger.html#getLogger(java.lang.String)"><CODE>getLogger(String)</CODE></A> except that the type of logger
instantiated depends on the type returned by the <A HREF="../../../org/apache/log4j/spi/LoggerFactory.html#makeNewLoggerInstance(java.lang.String)"><CODE>LoggerFactory.makeNewLoggerInstance(java.lang.String)</CODE></A> method of the
<code>factory</code> parameter.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../org/apache/log4j/Logger.html" title="class in org.apache.log4j">Logger</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Logger.html#getRootLogger()">getRootLogger</A></B>()</CODE>
<BR>
Return the root logger for the current logger repository.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Logger.html#isTraceEnabled()">isTraceEnabled</A></B>()</CODE>
<BR>
Check whether this category is enabled for the TRACE Level.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Logger.html#trace(java.lang.Object)">trace</A></B>(java.lang.Object message)</CODE>
<BR>
Log a message object with the <A HREF="../../../org/apache/log4j/Level.html#TRACE"><CODE>TRACE</CODE></A> level.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Logger.html#trace(java.lang.Object, java.lang.Throwable)">trace</A></B>(java.lang.Object message,
java.lang.Throwable t)</CODE>
<BR>
Log a message object with the <code>TRACE</code> level including the
stack trace of the <CODE>Throwable</CODE><code>t</code> passed as parameter.</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_org.apache.log4j.Category"><!-- --></A>
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<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class org.apache.log4j.<A HREF="../../../org/apache/log4j/Category.html" title="class in org.apache.log4j">Category</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../org/apache/log4j/Category.html#addAppender(org.apache.log4j.Appender)">addAppender</A>, <A HREF="../../../org/apache/log4j/Category.html#assertLog(boolean, java.lang.String)">assertLog</A>, <A HREF="../../../org/apache/log4j/Category.html#callAppenders(org.apache.log4j.spi.LoggingEvent)">callAppenders</A>, <A HREF="../../../org/apache/log4j/Category.html#debug(java.lang.Object)">debug</A>, <A HREF="../../../org/apache/log4j/Category.html#debug(java.lang.Object, java.lang.Throwable)">debug</A>, <A HREF="../../../org/apache/log4j/Category.html#error(java.lang.Object)">error</A>, <A HREF="../../../org/apache/log4j/Category.html#error(java.lang.Object, java.lang.Throwable)">error</A>, <A HREF="../../../org/apache/log4j/Category.html#exists(java.lang.String)">exists</A>, <A HREF="../../../org/apache/log4j/Category.html#fatal(java.lang.Object)">fatal</A>, <A HREF="../../../org/apache/log4j/Category.html#fatal(java.lang.Object, java.lang.Throwable)">fatal</A>, <A HREF="../../../org/apache/log4j/Category.html#forcedLog(java.lang.String, org.apache.log4j.Priority, java.lang.Object, java.lang.Throwable)">forcedLog</A>, <A HREF="../../../org/apache/log4j/Category.html#getAdditivity()">getAdditivity</A>, <A HREF="../../../org/apache/log4j/Category.html#getAllAppenders()">getAllAppenders</A>, <A HREF="../../../org/apache/log4j/Category.html#getAppender(java.lang.String)">getAppender</A>, <A HREF="../../../org/apache/log4j/Category.html#getChainedPriority()">getChainedPriority</A>, <A HREF="../../../org/apache/log4j/Category.html#getCurrentCategories()">getCurrentCategories</A>, <A HREF="../../../org/apache/log4j/Category.html#getDefaultHierarchy()">getDefaultHierarchy</A>, <A HREF="../../../org/apache/log4j/Category.html#getEffectiveLevel()">getEffectiveLevel</A>, <A HREF="../../../org/apache/log4j/Category.html#getHierarchy()">getHierarchy</A>, <A HREF="../../../org/apache/log4j/Category.html#getInstance(java.lang.Class)">getInstance</A>, <A HREF="../../../org/apache/log4j/Category.html#getInstance(java.lang.String)">getInstance</A>, <A HREF="../../../org/apache/log4j/Category.html#getLevel()">getLevel</A>, <A HREF="../../../org/apache/log4j/Category.html#getLoggerRepository()">getLoggerRepository</A>, <A HREF="../../../org/apache/log4j/Category.html#getName()">getName</A>, <A HREF="../../../org/apache/log4j/Category.html#getParent()">getParent</A>, <A HREF="../../../org/apache/log4j/Category.html#getPriority()">getPriority</A>, <A HREF="../../../org/apache/log4j/Category.html#getResourceBundle()">getResourceBundle</A>, <A HREF="../../../org/apache/log4j/Category.html#getResourceBundleString(java.lang.String)">getResourceBundleString</A>, <A HREF="../../../org/apache/log4j/Category.html#getRoot()">getRoot</A>, <A HREF="../../../org/apache/log4j/Category.html#info(java.lang.Object)">info</A>, <A HREF="../../../org/apache/log4j/Category.html#info(java.lang.Object, java.lang.Throwable)">info</A>, <A HREF="../../../org/apache/log4j/Category.html#isAttached(org.apache.log4j.Appender)">isAttached</A>, <A HREF="../../../org/apache/log4j/Category.html#isDebugEnabled()">isDebugEnabled</A>, <A HREF="../../../org/apache/log4j/Category.html#isEnabledFor(org.apache.log4j.Priority)">isEnabledFor</A>, <A HREF="../../../org/apache/log4j/Category.html#isInfoEnabled()">isInfoEnabled</A>, <A HREF="../../../org/apache/log4j/Category.html#l7dlog(org.apache.log4j.Priority, java.lang.String, java.lang.Object[], java.lang.Throwable)">l7dlog</A>, <A HREF="../../../org/apache/log4j/Category.html#l7dlog(org.apache.log4j.Priority, java.lang.String, java.lang.Throwable)">l7dlog</A>, <A HREF="../../../org/apache/log4j/Category.html#log(org.apache.log4j.Priority, java.lang.Object)">log</A>, <A HREF="../../../org/apache/log4j/Category.html#log(org.apache.log4j.Priority, java.lang.Object, java.lang.Throwable)">log</A>, <A HREF="../../../org/apache/log4j/Category.html#log(java.lang.String, org.apache.log4j.Priority, java.lang.Object, java.lang.Throwable)">log</A>, <A HREF="../../../org/apache/log4j/Category.html#removeAllAppenders()">removeAllAppenders</A>, <A HREF="../../../org/apache/log4j/Category.html#removeAppender(org.apache.log4j.Appender)">removeAppender</A>, <A HREF="../../../org/apache/log4j/Category.html#removeAppender(java.lang.String)">removeAppender</A>, <A HREF="../../../org/apache/log4j/Category.html#setAdditivity(boolean)">setAdditivity</A>, <A HREF="../../../org/apache/log4j/Category.html#setLevel(org.apache.log4j.Level)">setLevel</A>, <A HREF="../../../org/apache/log4j/Category.html#setPriority(org.apache.log4j.Priority)">setPriority</A>, <A HREF="../../../org/apache/log4j/Category.html#setResourceBundle(java.util.ResourceBundle)">setResourceBundle</A>, <A HREF="../../../org/apache/log4j/Category.html#shutdown()">shutdown</A>, <A HREF="../../../org/apache/log4j/Category.html#warn(java.lang.Object)">warn</A>, <A HREF="../../../org/apache/log4j/Category.html#warn(java.lang.Object, java.lang.Throwable)">warn</A></CODE></TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
<P>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="Logger(java.lang.String)"><!-- --></A><H3>
Logger</H3>
<PRE>
protected <B>Logger</B>(java.lang.String name)</PRE>
<DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<B>Method Detail</B></FONT></TH>
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</TABLE>
<A NAME="getLogger(java.lang.String)"><!-- --></A><H3>
getLogger</H3>
<PRE>
public static <A HREF="../../../org/apache/log4j/Logger.html" title="class in org.apache.log4j">Logger</A> <B>getLogger</B>(java.lang.String name)</PRE>
<DL>
<DD>Retrieve a logger named according to the value of the
<code>name</code> parameter. If the named logger already exists,
then the existing instance will be returned. Otherwise, a new
instance is created.
<p>By default, loggers do not have a set level but inherit it
from their neareast ancestor with a set level. This is one of the
central features of log4j.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - The name of the logger to retrieve.</DL>
</DD>
</DL>
<HR>
<A NAME="getLogger(java.lang.Class)"><!-- --></A><H3>
getLogger</H3>
<PRE>
public static <A HREF="../../../org/apache/log4j/Logger.html" title="class in org.apache.log4j">Logger</A> <B>getLogger</B>(java.lang.Class clazz)</PRE>
<DL>
<DD>Shorthand for <code>getLogger(clazz.getName())</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>clazz</CODE> - The name of <code>clazz</code> will be used as the
name of the logger to retrieve. See <A HREF="../../../org/apache/log4j/Logger.html#getLogger(java.lang.String)"><CODE>getLogger(String)</CODE></A>
for more detailed information.</DL>
</DD>
</DL>
<HR>
<A NAME="getRootLogger()"><!-- --></A><H3>
getRootLogger</H3>
<PRE>
public static <A HREF="../../../org/apache/log4j/Logger.html" title="class in org.apache.log4j">Logger</A> <B>getRootLogger</B>()</PRE>
<DL>
<DD>Return the root logger for the current logger repository.
<p>
The <A HREF="../../../org/apache/log4j/Category.html#getName()"><CODE>Logger.getName()</CODE></A> method for the root logger always returns
stirng value: "root". However, calling
<code>Logger.getLogger("root")</code> does not retrieve the root
logger but a logger just under root named "root".
<p>
In other words, calling this method is the only way to retrieve the
root logger.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getLogger(java.lang.String, org.apache.log4j.spi.LoggerFactory)"><!-- --></A><H3>
getLogger</H3>
<PRE>
public static <A HREF="../../../org/apache/log4j/Logger.html" title="class in org.apache.log4j">Logger</A> <B>getLogger</B>(java.lang.String name,
<A HREF="../../../org/apache/log4j/spi/LoggerFactory.html" title="interface in org.apache.log4j.spi">LoggerFactory</A> factory)</PRE>
<DL>
<DD>Like <A HREF="../../../org/apache/log4j/Logger.html#getLogger(java.lang.String)"><CODE>getLogger(String)</CODE></A> except that the type of logger
instantiated depends on the type returned by the <A HREF="../../../org/apache/log4j/spi/LoggerFactory.html#makeNewLoggerInstance(java.lang.String)"><CODE>LoggerFactory.makeNewLoggerInstance(java.lang.String)</CODE></A> method of the
<code>factory</code> parameter.
<p>This method is intended to be used by sub-classes.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - The name of the logger to retrieve.<DD><CODE>factory</CODE> - A <A HREF="../../../org/apache/log4j/spi/LoggerFactory.html" title="interface in org.apache.log4j.spi"><CODE>LoggerFactory</CODE></A> implementation that will
actually create a new Instance.<DT><B>Since:</B></DT>
<DD>0.8.5</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="trace(java.lang.Object)"><!-- --></A><H3>
trace</H3>
<PRE>
public void <B>trace</B>(java.lang.Object message)</PRE>
<DL>
<DD>Log a message object with the <A HREF="../../../org/apache/log4j/Level.html#TRACE"><CODE>TRACE</CODE></A> level.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>message</CODE> - the message object to log.<DT><B>Since:</B></DT>
<DD>1.2.12</DD>
<DT><B>See Also:</B><DD><A HREF="../../../org/apache/log4j/Category.html#debug(java.lang.Object)"><CODE>for an explanation of the logic applied.</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="trace(java.lang.Object, java.lang.Throwable)"><!-- --></A><H3>
trace</H3>
<PRE>
public void <B>trace</B>(java.lang.Object message,
java.lang.Throwable t)</PRE>
<DL>
<DD>Log a message object with the <code>TRACE</code> level including the
stack trace of the <CODE>Throwable</CODE><code>t</code> passed as parameter.
<p>
See <A HREF="../../../org/apache/log4j/Category.html#debug(java.lang.Object)"><CODE>Category.debug(Object)</CODE></A> form for more detailed information.
</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>message</CODE> - the message object to log.<DD><CODE>t</CODE> - the exception to log, including its stack trace.<DT><B>Since:</B></DT>
<DD>1.2.12</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="isTraceEnabled()"><!-- --></A><H3>
isTraceEnabled</H3>
<PRE>
public boolean <B>isTraceEnabled</B>()</PRE>
<DL>
<DD>Check whether this category is enabled for the TRACE Level.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>boolean - <code>true</code> if this category is enabled for level
TRACE, <code>false</code> otherwise.<DT><B>Since:</B></DT>
<DD>1.2.12</DD>
</DL>
</DD>
</DL>
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