All Implemented Interfaces: Serializable Direct Known Subclasses: UtilLoggingLevel public class Levelextends Priorityimplements Serializable Defines
Log4j Levels Order
the minimum set of levels recognized by the log4j2 log levels system, that is OFF, FATAL, ERROR, WARN, INFODEBUG and ALL. The
Log4j Set Log Level
Level class may be subclassed to define a larger level set. Author: Ceki Gülcü See Also:Serialized Form Field Summary staticLevelALL The ALL has the lowest possible rank and is intended to turn on all logging. staticLevelDEBUG The DEBUG Level designates fine-grained informational events that are most useful to debug slf4j log levels an application. staticLevelERROR The ERROR level designates error events that might still allow the application to continue running. staticLevelFATAL The FATAL level designates very severe error events that will presumably lead the application to abort. staticLevelINFO The INFO level designates informational messages that highlight the progress of the application at coarse-grained level. staticLevelOFF The OFF has the highest possible rank and is intended to turn off logging. staticLevelTRACE The TRACE Level designates finer-grained informational events than the DEBUG
Previous Page Next Page The org.apache.log4j.Level levels. You can also define your custom levels by sub-classing the Level class. Level Description ALL All levels including custom levels. DEBUG Designates fine-grained informational events that are most https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html useful to debug an application. ERROR Designates error events that might still allow the application to continue running. FATAL Designates very severe error events that will presumably lead the application to abort. INFO Designates informational messages that highlight the progress of the application at coarse-grained level. OFF The highest possible rank and is intended to turn off logging. TRACE Designates finer-grained informational events than the DEBUG. WARN Designates potentially harmful situations. https://www.tutorialspoint.com/log4j/log4j_logging_levels.htm How do Levels Works? A log request of level p in a logger with level q is enabled if p >= q. This rule is at the heart of log4j. It assumes that levels are ordered. For the standard levels, we have ALL < DEBUG < INFO < WARN < ERROR < FATAL < OFF. The Following example shows how we can filter all our DEBUG and INFO messages. This program uses of logger method setLevel(Level.X) to set a desired logging level: This example would print all the messages except Debug and Info: import org.apache.log4j.*; public class LogClass { private static org.apache.log4j.Logger log = Logger.getLogger(LogClass.class); public static void main(String[] args) { log.setLevel(Level.WARN); log.trace("Trace Message!"); log.debug("Debug Message!"); log.info("Info Message!"); log.warn("Warn Message!"); log.error("Error Message!"); log.fatal("Fatal Message!"); } } When you compile and run the LogClass program, it would generate the following result − Warn Message! Error Message! Fatal Message! Setting Levels using Configuration File log4j provides you configuration file based level setting which sets you free from changing the source code when you want to change the debugging level. Following is an example configuration file which would perform the same task as we did using the log.setLevel(Level.WARN) method in the above example. # Define the root logger with appender file log = /usr/home/
Pooling(DRCP) IBM Systems Director » Log4J Levels: ALL > TRACE > DEBUG > INFO > WARN > ERROR > FATAL >OFF 2009/11/17 作者：Jesse Hu Loggers may be assigned levels. The set of possible levels, that https://jessehu.wordpress.com/2009/11/17/log4j-levels-all-trace-debug-info-warn-error-fatal-off/ is DEBUG, INFO, WARN, ERROR and FATAL are defined in the org.apache.log4j.Level class. If a given logger is not assigned a level, then it inherits one from its closest ancestor with an assigned level. http://stackoverflow.com/questions/17442877/how-to-configure-log4j-to-log-only-info-messages-and-higher The root logger resides at the top of the logger hierarchy. It always exists and always has an assigned level. The logger is the core component of the logging process. In log4j, there are 5 log level normal levels Levels of logger available (not including custom Levels), the following is borrowed from the log4j API (http://jakarta.apache.org/log4j/docs/api/index.html): DEBUG - The DEBUG Level designates fine-grained informational events that are most useful to debug an application. INFO - The INFO level designates informational messages that highlight the progress of the application at coarse-grained level. WARN - The WARN level designates potentially harmful situations. ERROR - The ERROR level designates error log4j error info events that might still allow the application to continue running. TRACE - The TRACE Level designates finer-grained informational events than the DEBUG FATAL - The FATAL level designates very severe error events that will presumably lead the application to abort. In addition, there are two special levels of logging available: (descriptions borrowed from the log4j API http://jakarta.apache.org/log4j/docs/api/index.html): ALL -The ALL Level has the lowest possible rank and is intended to turn on all logging. OFF - The OFF Level has the highest possible rank and is intended to turn off logging. source: http://www.allapplabs.com/log4j/log4j_levels.htm http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html 赞过：赞 正在加载…… 相关 发表在 Uncategorized | Tagged java, log4j, tips | 5条评论 5条回应 于 2013/09/05 在 9:35 下午 | 回复 ERROR, INFO, DEBUG, FATAL ERROR, INFO, DEBUG, FATAL 于 2015/06/14 在 5:50 下午 | 回复 konoron > DEBUG – The DEBUG Level designates fine-grained informational events that are most useful to debug an application. > TRACE – The TRACE Level designates finer-grained informational events than the DEBUG Any examples of their differences? Thank you. 于 2015/10/01 在 12:30 上午 | 回复 bloodgain @konoron: DEBUG - Information the developer might use to debug the application, but is not useful to normal log users. For example: variable values, partial calculations, or thread management information
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to configure log4j to log only info messages and higher? up vote 2 down vote favorite I don't use config or xml files for configuring log4j as there no need to configure it deeply. I only need to print messages to the console. so I do this: BasicConfigurator.configure(); and to print only info and higher messages I do this: Logger LOG = Logger.getLogger(MyClass.class) LOG.setLevel(Level.INFO); But nevertheless I see debug messages in the console too. But I only need info and actually error messages to be printed. How to do this? UPD: I created a config file with the which contains, as described in the tutorial here: manual the following: log4j.rootLogger=INFO, stdout # Direct log messages to stdout log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L %m%n log4j.logger.com.messagedna.facade=INFO log4j.logger.com.messagedna.receiver=INFO log4j.logger.com.messagedna.util=INFO log4j.logger.com.messagedna.parser=INFO I put it to the com.messagedna In every class I need logger in I wrote the following: Properties props = new Properties(); try { props.load(new FileInputStream("/log4j.properties")); } catch (Exception e){ LOG.error(e); } PropertyConfigurator.configure(props); but when I run my app I get the following: log4j:WARN No appenders could be found for logger (com.messagedna.server.util.Config). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.a
All Debug Info Warn Error Fatal Off table id toc tbody tr td div id toctitle Contents div ul li a href Log j Debug Levels a li li a href Logger Levels Java a li li a href Log j Trace a li li a href Trace Level Definition a li ul td tr tbody table p All Implemented Interfaces Serializable Direct relatedl Known Subclasses UtilLoggingLevel public class Levelextends log level hierarchy Priorityimplements Serializable DL Defines the minimum set of p h id Log j Debug Levels p levels recognized by the system that is OFF FATAL ERROR WARN
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Fatal Error Warn Info Debug table id toc tbody tr td div id toctitle Contents div ul li a href Log Level Hierarchy a li li a href Log Level Trace Vs Debug a li li a href Logging Levels Java a li li a href Syslog Logging Levels a li ul td tr tbody table p All Implemented relatedl Interfaces Serializable Direct Known p h id Log Level Hierarchy p Subclasses UtilLoggingLevel public class Levelextends Priorityimplements Serializable DL log j debug levels Defines the minimum set of levels recognized by the system p h id Log Level Trace Vs
Info Debug Error table id toc tbody tr td div id toctitle Contents div ul li a href Log Level Hierarchy a li li a href Debug Level Samsung a li li a href Log j Log Levels a li li a href Slf j Log Levels a li ul td tr tbody table p Pooling DRCP IBM Systems Director raquo Log J Levels ALL TRACE DEBUG INFO WARN ERROR relatedl FATAL OFF Jesse Hu Loggers may be assigned p h id Log Level Hierarchy p levels The set of possible levels that is DEBUG INFO WARN ERROR log j
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Log j Error Warn Info table id toc tbody tr td div id toctitle Contents div ul li a href Log Levels Log j a li li a href Log j Set Log Level a li li a href Syslog Logging Levels a li ul td tr tbody table p All Implemented Interfaces Serializable Direct Known Subclasses UtilLoggingLevel public relatedl class Levelextends Priorityimplements Serializable DL Defines the log j levels order minimum set of levels recognized by the system p h id Log Levels Log j p that is OFF FATAL ERROR WARN INFO code code DEBUG and ALL The
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Log Error Information table id toc tbody tr td div id toctitle Contents div ul li a href Log Level Hierarchy a li li a href Log Levels Log j a li li a href Logging Levels Java a li li a href Log warn Java a li ul td tr tbody table p Log relatedl All Known Implementing Classes AvalonLogger p h id Log Level Hierarchy p Jdk LumberjackLogger Jdk Logger Log JLogger LogKitLogger NoOpLog SimpleLog public interface logging levels python Log A simple logging interface abstracting logging APIs In order to be log info java instantiated successfully by
Log j Error Fatal table id toc tbody tr td div id toctitle Contents div ul li a href Log j Levels Order a li li a href Log j Set Log Level a li li a href Slf j Log Levels a li li a href Log j Threshold a li ul td tr tbody table p All relatedl Implemented Interfaces Serializable Direct Known p h id Log j Levels Order p Subclasses UtilLoggingLevel public class Levelextends Priorityimplements log j log levels Serializable DL Defines the minimum set of levels recognized by the p h id Log j Set
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Log Levels Debug Info Error table id toc tbody tr td div id toctitle Contents div ul li a href Log Levels Log j a li li a href Log j Log Levels a li li a href Logging Levels Java a li ul td tr tbody table p All Implemented Interfaces Serializable Direct relatedl Known Subclasses UtilLoggingLevel public class log level hierarchy Levelextends Priorityimplements Serializable DL Defines the minimum set p h id Log Levels Log j p of levels recognized by the system that is OFF FATAL ERROR p h id Log j Log Levels p WARN INFO
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Log j Level Value Error table id toc tbody tr td div id toctitle Contents div ul li a href Log j Log Level a li li a href Logger Levels Java a li li a href Log j Threshold a li ul td tr tbody table p All Implemented Interfaces Serializable relatedl Direct Known Subclasses UtilLoggingLevel public class log j levels order Levelextends Priorityimplements Serializable DL Defines the minimum set p h id Log j Log Level p of levels recognized by the system that is OFF FATAL ERROR org apache log j level jar WARN INFO code code
Log j Debug Info Warn Error Fatal table id toc tbody tr td div id toctitle Contents div ul li a href Log j Threshold a li li a href Logger Levels Java a li li a href Log j Logger a li ul td tr tbody table p Pooling DRCP IBM Systems Director raquo Log J Levels ALL relatedl TRACE DEBUG INFO WARN log j levels order ERROR FATAL OFF Jesse Hu Loggers may be p h id Log j Threshold p assigned levels The set of possible levels that is DEBUG INFO WARN ERROR and FATAL log j
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Log j Logging Levels Error table id toc tbody tr td div id toctitle Contents div ul li a href Log j Log Level a li li a href Syslog Logging Levels a li li a href Log j Set Log Level a li ul td tr tbody table p All Implemented Interfaces Serializable Direct Known Subclasses UtilLoggingLevel relatedl public class Levelextends Priorityimplements Serializable DL Defines log j levels order the minimum set of levels recognized by the org apache log j level jar system that is OFF FATAL ERROR WARN INFO code code DEBUG and ALL The Level log
Log Level Debug Info Error table id toc tbody tr td div id toctitle Contents div ul li a href Log j Log Level a li li a href Logging Levels Java a li li a href Syslog Logging Levels a li li a href Log j Set Log Level a li ul td tr tbody table p Log j x Migration API Configuration Web Applications and JSPs Lookups Appenders Layouts Filters Async Loggers Garbage-free Logging JMX Logging Separation Extending Log j Plugins Programmatic relatedl Log j Configuration Custom Log Levels In Code In Configuration log level hierarchy Adding or
Log j Error Levels table id toc tbody tr td div id toctitle Contents div ul li a href Org apache log j level Jar a li li a href Slf j Log Levels a li li a href Logger Levels Java a li li a href Syslog Logging Levels a li ul td tr tbody table p All Implemented Interfaces Serializable Direct relatedl Known Subclasses UtilLoggingLevel public class log j levels order Levelextends Priorityimplements Serializable DL Defines the minimum set p h id Org apache log j level Jar p of levels recognized by the system that is OFF
Log j Info Error table id toc tbody tr td div id toctitle Contents div ul li a href Org apache log j level Jar a li li a href Log j Log Levels a li li a href Log j Set Log Level a li li a href Logger Levels Java a li ul td tr tbody table p log j - Configuration log j - Sample Program log j - Logging Methods log j - Logging relatedl Levels log j - Log Formatting log j - Logging log j levels order in Files log j - Logging in
Loglevel Error table id toc tbody tr td div id toctitle Contents div ul li a href Log Levels Java a li li a href Log j Set Log Level a li ul td tr tbody table p Log relatedl All Known Implementing Classes AvalonLogger Jdk LumberjackLogger log level hierarchy Jdk Logger Log JLogger LogKitLogger NoOpLog SimpleLog public interface Log log levels log j A simple logging interface abstracting logging APIs In order to be instantiated log j log levels successfully by LogFactory classes that implement this interface must have a constructor that takes a single String parameter representing slf
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Log j Trace Debug Info Warn Error table id toc tbody tr td div id toctitle Contents div ul li a href Log j Log Level a li li a href Log Level Trace Vs Debug a li li a href Slf j Log Levels a li li a href Log j Threshold a li ul td tr tbody table p All Implemented Interfaces Serializable Direct Known Subclasses UtilLoggingLevel relatedl public class Levelextends Priorityimplements Serializable DL Defines log j levels order the minimum set of levels recognized by the system p h id Log j Log Level p that is
Log j Fatal Error table id toc tbody tr td div id toctitle Contents div ul li a href Log j Levels Order a li li a href Log Levels Log j a li li a href Slf j Log Levels a li li a href Log j Logging a li ul td tr tbody table p All relatedl Implemented Interfaces Serializable Direct Known p h id Log j Levels Order p Subclasses UtilLoggingLevel public class Levelextends Priorityimplements Serializable DL org apache log j level jar Defines the minimum set of levels recognized by the system p h id Log
Log j Error Level table id toc tbody tr td div id toctitle Contents div ul li a href Log j Log Levels a li li a href Org apache log j level Jar a li li a href Logger Levels Java a li ul td tr tbody table p All Implemented Interfaces Serializable Direct Known Subclasses UtilLoggingLevel public relatedl class Levelextends Priorityimplements Serializable DL Defines the minimum log j levels order set of levels recognized by the system that p h id Log j Log Levels p is OFF FATAL ERROR WARN INFO code code DEBUG and ALL The