No appenders could be found for logger log4j

Question

I have put log4j to my buildpath  but I get the following message when I run my application   log4j WARN No appenders could be found for logger  dao hsqlmanager   log4j WARN Please initialize the log4j system properly  log4j WARN See http   logging apache org log4j 1 2 faq html noconfig for more info    What do these warnings mean   Whats the appender here

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For me  the reason was apparently different  and the error message misleading   With just this in my build gradle  it would complain that slf4j was missing at the beginning of the log  but still log things  albeit in a poor format       compile  log4j log4j 1 2 17    Adding that dependency would cause the discussed  no appenders could be found  error message for me  even though I had defined them in src main java log4j properties       compile  log4j log4j 1 2 17      compile  org slf4j slf4j-log4j12 1 7 25    Finally  adding the following dependency  which I only guessed at by copycatting it from another project  resolved the issue       compile  log4j log4j 1 2 17      compile  org slf4j slf4j-log4j12 1 7 25      compile  commons-logging commons-logging 1 2    I don t know why  but with this it works  Any insights on that

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I get the same error  Here the problem which leads to this error message   I create some objects which use the Logger before I configure the log4j   Logger getLogger Lang class getName    debug  Loading language      filename     Solution   Configure the log4j at the beginning in the main method   PropertyConfigurator configure xmlLog4JConfigFile       or BasicConfigurator configure    if you dont have a config file

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I ran into this issue when trying to build an executable jar with maven in intellij 12  It turned out that because the  java manifest file didn t include a class path the log4j properties file couldn t be found at the root level  where the jar file was executed from     FYI I was getting the logger like this   Logger log   LogManager getLogger MyClassIWantedToLogFrom class     And I was able to get it to work with a pom file that included this             lt plugin gt               lt artifactId gt maven-assembly-plugin lt  artifactId gt               lt version gt 2 2-beta-5 lt  version gt               lt configuration gt                   lt archive gt                       lt manifest gt                           lt addClasspath gt true lt  addClasspath gt                            lt mainClass gt com mycompany mainPackage mainClass lt  mainClass gt                       lt  manifest gt                       lt manifestEntries gt                           lt Class-Path gt   lt  Class-Path gt   lt  -- need to add current directory to classpath properties files can be found -- gt                       lt  manifestEntries gt                   lt  archive gt                   lt descriptorRefs gt                       lt descriptorRef gt jar-with-dependencies lt  descriptorRef gt                   lt  descriptorRefs gt               lt  configuration gt               lt executions gt                   lt execution gt                       lt id gt make-assembly lt  id gt                       lt phase gt package lt  phase gt                       lt goals gt                           lt goal gt single lt  goal gt                       lt  goals gt                   lt  execution gt               lt  executions gt           lt  plugin gt

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Consider the log4j JVM argument Dlog4j configuration  In general    Add the JVM argument that points out the log4j config file  The syntax is just like follows   java   options   -jar file jar   arguments     A sample of a real command line is just like the following   java -Dlog4j configuration conf log4j xml -jar myJarFile jar myArg1 myArg2   For IntelliJ IDE users   1 Run Debug Configurations 2 Edit configurations    3 VM options 4 Enter the same value also starting with  -D    Tips    1 Eclipse IDE users will find an equivalent approach  2 For the run debug configuration editor  it s very likely that  at the beginning of the times  your particular executable file is not there  Depending on the size of the project you re currently working on  it can be unpleasant to navigate directories to find it  It s less of a hassle if you just run execute the file  click play  once before proceeding to run debug config no matter what the execution result is   3 Pay attention to your working directory  relative paths  and classpath

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Add the following as the first code   Properties prop   new Properties    prop setProperty  log4j rootLogger    WARN    PropertyConfigurator configure prop

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Another reason this may happen  in RCP4  is that you are using multiple logging frameworks in your target file   As an example  this will occur if you use a combination of slf4j  log4j and ch qos logback slf4j in your target files content tab

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Make sure your project is open in Eclipse  then click on the  Run  menu at the top of Eclipse and click on the following    Run Run Configurations Classpath  tab  User Entries add jar on the right  add log4j jar file Apply Run   The error message should no longer appear

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Log4J display this warning message when Log4j Java code is searching to create a first log line in your program   At this moment  Log4j make 2 things   it search to find log4j properties file it search to instantiate the appender define in log4j properties   If log4J doesn t find log4j properties file or if appender declared in log4j rootlogger are not defined elsewhere in log4j properties file the warning message is displayed   CAUTION  the content of Properties file must be correct   The following content is NOT correct  log4j rootLogger file  log4j appender FILE org apache log4j FileAppender log4j appender FILE File c  Trace MsgStackLogging log log4j appender FILE layout org apache log4j PatternLayout log4j appender FILE layout ConversionPattern  m n log4j appender FILE ImmediateFlush true log4j appender FILE Threshold debug log4j appender FILE Append false   because file appender is declared in LOWER-CASE in log4j rootlogger statement and defined in log4j appender statement using UPPER-CASE    A correct file would be  log4j rootLogger FILE  log4j appender FILE org apache log4j FileAppender log4j appender FILE File c  Trace MsgStackLogging log log4j appender FILE layout org apache log4j PatternLayout log4j appender FILE layout ConversionPattern  m n log4j appender FILE ImmediateFlush true log4j appender FILE Threshold debug log4j appender FILE Append false   If MAVEN is used  you must put log4j properties files in src main resources AND start a MAVEN build   Log4j properties file is then copied in target classes folder   Log4J use the log4j properties file that it found in target classes

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I faced the same problem when I use log4j2  My problem is caused by using wrong dependent library    lt dependency gt           lt groupId gt org slf4j lt  groupId gt           lt artifactId gt slf4j-log4j12 lt  artifactId gt           lt scope gt runtime lt  scope gt       lt  dependency gt    Instead  I should use    lt dependency gt           lt groupId gt org apache logging log4j lt  groupId gt           lt artifactId gt log4j-slf4j-impl lt  artifactId gt           lt scope gt runtime lt  scope gt       lt  dependency gt    In my case  I have a log4j2 xml defined in my  resources  directory  and specified to use it by   System setProperty  log4j configurationFile    log4j2 xml

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I think you should understand where the log4j jar file or the Java code looks for the log4j configuration files  src main resources log4j properties is Eclipse path  Place them in a proper location so that you don t have to hard code the absolute path  in code  Read my article and sample solution for that https   askyourquestions info how-to-see-where-the-log-is-logger-in-slf4j

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If you are using Eclipse and this problem appeared out of nowhere after everything worked fine beforehand  try going to Project - Clean - Clean

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It looks like you need to add the location of your log4j properties file to the Classpath in Eclipse   Make sure your project is open in Eclipse  then click on the  Run  menu at the top of Eclipse and click on the following    Run Run Configurations Classpath  tab  User Entries Advanced  button on the right  Add Folders then navigate to the folder that contains your log4j properties file Apply Run   The error message should no longer appear

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You use the Logger in your code to log a message  The Appender is a Object appended to a Logger to write the message to a specific target  There are FileAppender to write to text-files or the ConsoleAppender to write to the Console  You need to show your code of the Logger and Appender setup for more help   please read the tutorial for a better understanding of the interaction of Logger and Appender

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My Eclipse installation could not find log4j properties when running JUnit tests from Eclipse  even though the file was located at src test resources   The reason was that Eclipse  or the m2e connector  did not copy content from src test resources to the expected output folder target test-classes - the root cause was that in the project s properties under Java Build Path -  Source tab -  Source folders on build path -  src test resources  somehow there was an Excluded     entry  I removed that excluded entry   Alternatively  I could have manually copied src test resources log4j properties to target test-classes log4j properties

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Quick solution    add code to main function   String log4jConfPath     path to log4j properties   PropertyConfigurator configure log4jConfPath    create a file named log4j properties at  path to  log4j rootLogger INFO  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 yy MM dd HH mm ss   p  c 2    m n

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The reason can be lack of the word static in some   final static Logger logging   Logger getLogger ProcessorTest class     If I make logger the instance field  I am getting exactly this very warning    No appenders could be found for logger  org apache kafka producer Sender    What is worse  the warning points not to ProcessorTest  where the mistake lives  but to an absolutely different class  Sender  as a source of problems  That class has correct set logger and need not any changes  We could look for the problem for ages

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First import    import org apache log4j PropertyConfigurator    Then add below code to main method   String log4jConfPath   path to log4j properties   PropertyConfigurator configure log4jConfPath     Create a file at path to  and add the below code to that file   log4j rootLogger INFO  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 yy MM dd HH mm ss   p  c 2    m n

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The solution on this site worked for me https   crunchify com java-how-to-configure-log4j-logger-property-correctly   I now see no warnings at all from log4j  I put this in a log4j properties file that I put in src main resources    This sets the global logging level and specifies the appenders log4j rootLogger INFO  theConsoleAppender    settings for the console appender log4j appender theConsoleAppender org apache log4j ConsoleAppender log4j appender theConsoleAppender layout org apache log4j PatternLayout log4j appender theConsoleAppender layout ConversionPattern  -4r   t   -5p  c  x -  m n

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In my case  the error was the flag  additivity   If it s  false  for you root project package  then the child packages will not have an appender and you will see the  appender not found  error

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Most of the answers here suggested that log4j properties file be placed in the right location for maven project  it should be located in src main resources   But for me  the problem is that my log4j properties is not correctly configured  Here s a sample that works for me  you can try it out first     Root logger option 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

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Make sure the properties file has properly set  And again  it seems like that the compiler cannot find the properties file  you can set as follow at the pom   only when you use maven project     lt build gt          lt sourceDirectory gt  src main java lt  sourceDirectory gt          lt testSourceDirectory gt  src test java lt  testSourceDirectory gt           lt resources gt                lt resource gt                     lt directory gt resources lt  directory gt                lt  resource gt           lt  resources gt              lt  build  gt

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In java eclipse copy your conf ref to conf folder

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As explained earlier there are 2 approaches   First one is to just add this line to your main method   BasicConfigurator configure      Second approach is to add this standard log4j properties file to your classpath   While taking second approach you need to make sure you initialize the file properly  Eg   Properties props   new Properties    props load new FileInputStream  log4j property file path     props setProperty  log4j appender File File    Folder where you want to store log files      File Name      Make sure you create required folder to store log files

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If log4j properties is indeed on the classpath  you are using Spring Boot to make a WAR file for deployment to an app server  you are omitting a web xml file in favour of Spring Boot s autoconfigure  and you are not getting any log messages whatsoever  you need to explicitly configure Log4j  Assuming you are using Log4j 1 2 x   public class AppConfig extends SpringBootServletInitializer        public static void main  String   args                Launch the application         ConfigurableApplicationContext context   SpringApplication run  AppConfig class  args                Override     protected SpringApplicationBuilder configure  SpringApplicationBuilder application             InputStream log4j   this getClass   getClassLoader   getResourceAsStream  log4j properties            PropertyConfigurator configure log4j           return application            Other beans as required

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First of all  Create a log4j properties file    Root logger option 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   Place it in src main resources   After that  use this 2 dependencies    lt dependency gt               lt groupId gt org slf4j lt  groupId gt               lt artifactId gt slf4j-api lt  artifactId gt               lt version gt 1 7 5 lt  version gt           lt  dependency gt           lt dependency gt               lt groupId gt org slf4j lt  groupId gt               lt artifactId gt slf4j-log4j12 lt  artifactId gt               lt version gt 1 7 5 lt  version gt           lt  dependency gt    It is necessary to add this final dependency to POM file    lt  -- https   mvnrepository com artifact org springframework spring-context -- gt           lt dependency gt               lt groupId gt org springframework lt  groupId gt               lt artifactId gt spring-context lt  artifactId gt               lt version gt 5 1 5 RELEASE lt  version gt           lt  dependency gt

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This is just a warning   Fixing  This occurs when the default configuration files log4j properties and log4j xml can not be found and the application performs no explicit configuration   To fix that  simply create copy log4j properties or log4j xml into your a location on the classpath  usually the same as the jar files    Optionally set java option  -Dlog4j configuration file    path to log4j properties      log4j uses Thread getContextClassLoader   getResource   to locate the default configuration files and does not directly check the file system  Knowing the appropriate location to place log4j properties or log4j xml requires understanding the search strategy of the class loader in use  log4j does not provide a default configuration since output to the console or to the file system may be prohibited in some environments    Debugging  For debugging  you may try to use -Dlog4j debug true parameter   Configuration of log4j properties  Sample configuration of log4j properties     Set root logger level to DEBUG and its only appender to A1  log4j rootLogger DEBUG  A1    A1 is set to be a ConsoleAppender  log4j appender A1 org apache log4j ConsoleAppender    A1 uses PatternLayout  log4j appender A1 layout org apache log4j PatternLayout log4j appender A1 layout ConversionPattern  -4r   t   -5p  c  x -  m n    Print only messages of level WARN or above in the package com foo  log4j logger com foo WARN   Here is another configuration file that uses multiple appenders   log4j rootLogger debug  stdout  R  log4j appender stdout org apache log4j ConsoleAppender log4j appender stdout layout org apache log4j PatternLayout    Pattern to output the caller s file name and line number  log4j appender stdout layout ConversionPattern  5p   t    F  L  -  m n  log4j appender R org apache log4j RollingFileAppender log4j appender R File example log  log4j appender R MaxFileSize 100KB   Keep one backup file log4j appender R MaxBackupIndex 1  log4j appender R layout org apache log4j PatternLayout log4j appender R layout ConversionPattern  p  t  c -  m n   Apache Solr  If using Solr  copy  lt solr gt  example resources log4j properties into a location on the classpath   Sample configuration of log4j properties from Solr goes like      Logging level solr log logs  log4j rootLogger INFO  file  CONSOLE  log4j appender CONSOLE org apache log4j ConsoleAppender  log4j appender CONSOLE layout org apache log4j PatternLayout log4j appender CONSOLE layout ConversionPattern  -4r   t   -5p  c  x  u2013  m n   - size rotation with log cleanup  log4j appender file org apache log4j RollingFileAppender log4j appender file MaxFileSize 4MB log4j appender file MaxBackupIndex 9   - File to log to and log format log4j appender file File   solr log  solr log log4j appender file layout org apache log4j PatternLayout log4j appender file layout ConversionPattern  -5p -  d yyyy-MM-dd HH mm ss SSS    C   m n  log4j logger org apache zookeeper WARN log4j logger org apache hadoop WARN    set to INFO to enable infostream log messages log4j logger org apache solr update LoggingInfoStream OFF     See also    Short introduction to log4j  Default Initialization Procedure Why can t log4j find my properties in a J2EE or WAR application

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if you work together with a lot of projects you may face a style problem     you have to have one lof4j properties file and this file is included log properties of other project     Beside you can try to put log4j properties files into src path when the project is worked Linux OS  libs of other project and log4 properties files can be under one folder into a location on the classpath

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I had this problem too  I just forgot to mark the resources directory in IntelliJ IDEA   Rightclick on your directory Mark directory as Resources root

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Maybe add the relevent project contains log4j in java build path  I add mahout h2o into it when I met this problem in  a mahout project using eclipse  it works

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This Short introduction to log4j guide is a little bit old but still valid   That guide will give you some information about how to use loggers and appenders     Just to get you going you have two simple approaches you can take   First one is to just add this line to your main method   BasicConfigurator configure      Second approach is to add this standard log4j properties  taken from the above mentioned guide  file to your classpath     Set root logger level to DEBUG and its only appender to A1  log4j rootLogger DEBUG  A1    A1 is set to be a ConsoleAppender  log4j appender A1 org apache log4j ConsoleAppender    A1 uses PatternLayout  log4j appender A1 layout org apache log4j PatternLayout log4j appender A1 layout ConversionPattern  -4r   t   -5p  c  x -  m n

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I faced the same issue when I tried to run the JUnit test class   The issue is resolved after I manually added the log4j properties file in the src test resources folder   Adding the below code to the log4j properties file solved the issue     Root logger option log4j rootLogger INFO  file  stdout    Direct log messages to a log file log4j appender file org apache log4j RollingFileAppender log4j appender file File C   logging log log4j appender file MaxFileSize 10MB log4j appender file MaxBackupIndex 10 log4j appender file layout org apache log4j PatternLayout log4j appender file layout ConversionPattern  d yyyy-MM-dd HH mm ss   -5p  c 1   L -  m n    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

[java] No appenders could be found for logger(log4j)?

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