Package org.apache.log4j
Class Logger
java.lang.Object
org.apache.log4j.Category
org.apache.log4j.Logger
- All Implemented Interfaces:
AppenderAttachable
- Direct Known Subclasses:
NOPLogger
,RootCategory
,RootLogger
This is the central class in the log4j package. Most logging operations,
except configuration, are done through this class.
- Since:
- log4j 1.2
- Author:
- Ceki Gülcü
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Field Summary
Fields inherited from class org.apache.log4j.Category
additive, level, name, parent, repository, resourceBundle
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic Logger
Shorthand forgetLogger(clazz.getName())
.static Logger
Retrieve a logger named according to the value of thename
parameter.static Logger
getLogger
(String name, LoggerFactory factory) LikegetLogger(String)
except that the type of logger instantiated depends on the type returned by theLoggerFactory.makeNewLoggerInstance(java.lang.String)
method of thefactory
parameter.static Logger
Return the root logger for the current logger repository.boolean
Check whether this category is enabled for the TRACE Level.void
Log a message object with theTRACE
level.void
Log a message object with theTRACE
level including the stack trace of theThrowable
t
passed as parameter.Methods inherited from class org.apache.log4j.Category
addAppender, assertLog, callAppenders, debug, debug, error, error, exists, fatal, fatal, forcedLog, getAdditivity, getAllAppenders, getAppender, getChainedPriority, getCurrentCategories, getDefaultHierarchy, getEffectiveLevel, getHierarchy, getInstance, getInstance, getLevel, getLoggerRepository, getName, getParent, getPriority, getResourceBundle, getResourceBundleString, getRoot, info, info, isAttached, isDebugEnabled, isEnabledFor, isInfoEnabled, l7dlog, l7dlog, log, log, log, removeAllAppenders, removeAppender, removeAppender, setAdditivity, setLevel, setPriority, setResourceBundle, shutdown, warn, warn
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Constructor Details
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Logger
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Method Details
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getLogger
Retrieve a logger named according to the value of thename
parameter. If the named logger already exists, then the existing instance will be returned. Otherwise, a new instance is created.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.
- Parameters:
name
- The name of the logger to retrieve.
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getLogger
Shorthand forgetLogger(clazz.getName())
.- Parameters:
clazz
- The name ofclazz
will be used as the name of the logger to retrieve. SeegetLogger(String)
for more detailed information.
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getRootLogger
Return the root logger for the current logger repository.The
Logger.getName()
method for the root logger always returns string value: "root". However, callingLogger.getLogger("root")
does not retrieve the root logger but a logger just under root named "root".In other words, calling this method is the only way to retrieve the root logger.
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getLogger
LikegetLogger(String)
except that the type of logger instantiated depends on the type returned by theLoggerFactory.makeNewLoggerInstance(java.lang.String)
method of thefactory
parameter.This method is intended to be used by sub-classes.
- Parameters:
name
- The name of the logger to retrieve.factory
- ALoggerFactory
implementation that will actually create a new Instance.- Since:
- 0.8.5
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trace
Log a message object with theTRACE
level.- Parameters:
message
- the message object to log.- Since:
- 1.2.12
- See Also:
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trace
Log a message object with theTRACE
level including the stack trace of theThrowable
t
passed as parameter.See
Category.debug(Object)
form for more detailed information.- Parameters:
message
- the message object to log.t
- the exception to log, including its stack trace.- Since:
- 1.2.12
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isTraceEnabled
public boolean isTraceEnabled()Check whether this category is enabled for the TRACE Level.- Returns:
- boolean -
true
if this category is enabled for level TRACE,false
otherwise. - Since:
- 1.2.12
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