SLF4J Failed to load class org slf4j impl StaticLoggerBinder

Question

My application is to be deployed on both tcServer and WebSphere 6 1  This application uses ehCache and so requires slf4j as a dependency  As a result I ve added the slf4j-api jar  1 6  jar to my war file bundle   The application works fine in tcServer except for the following error   SLF4J  Failed to load class  org slf4j impl StaticLoggerBinder   SLF4J  Defaulting to no-operation  NOP  logger implementation SLF4J  See http   www slf4j org codes html StaticLoggerBinder for further details    However  when I deploy in WebSphere I get a java lang NoClassDefFoundError  org slf4j impl StaticLoggerBinder   Also accompanied by Failed to load class  org slf4j impl StaticMDCBinder   I ve checked the classpaths of both application servers and there is no other slf4j jar   Does anyone have any ideas what may be happening here

User · Answer

Most likely your problem was because of <scope>test</scope> (in some cases also <scope>provided</scope>), as mentioned @thangaraj.

Documentation says:

This scope indicates that the dependency is not required for normal use of the application, and is only available for the test compilation and execution phases. Test dependencies aren’t transitive and are only present for test and execution classpaths.

So, if you don't need dependecies for test purposes then you can use instead of (what you will see in mvnrepository):

<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-nop -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-nop</artifactId>
    <version>1.7.24</version>
    <scope>test</scope>
</dependency>

Without any scopes (by default would be compile scope when no other scope is provided):

<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-nop -->
<dependency>  
   <groupId>org.slf4j</groupId>
   <artifactId>slf4j-nop</artifactId>
   <version>1.7.25</version>
</dependency>

This is the same as:

 <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-nop -->
 <dependency>  
   <groupId>org.slf4j</groupId>
   <artifactId>slf4j-nop</artifactId>
   <version>1.7.25</version>
   <scope>compile</scope>
 </dependency>

User · Answer

I was facing same error  I have configured slf4j-api  slf4j-log4j12 and log4j  in my local development  All configuration was fine  but slf4j-log4j12 dependency which I copied from mvnrepository had test scope  lt scope gt test lt  scope gt   When I removed this every thing is fine    Some times silly mistakes breaks our head

User · Answer

For me the issue was  Using Hibernate  I saw that it already used slf4j  and it was in my classpath already  so I decided to use it  The next step - adding imlementor for slf4j  so I added to maven    lt dependency gt           lt groupId gt org slf4j lt  groupId gt           lt artifactId gt slf4j-jdk14 lt  artifactId gt           lt version gt 1 7 25 lt  version gt   lt  dependency gt    But it failed with error  SLF4J  Failed to load class    org slf4j impl StaticLoggerBinder     The solution was   Hibernate s dependency of slf4j was version 1 7 26  and I added minor version dependency 1 7 25  So when I fixed this - all became OK

User · Answer

As SLF4J Manual states     The Simple Logging Facade for Java  SLF4J  serves as a simple facade   or abstraction for various logging frameworks  such as   java util logging  logback and log4j    and     The warning will disappear as soon as you add a binding to your class path     So you should choose which binding do you want to use   NoOp binding  slf4j-nop      Binding for NOP  silently discarding all logging    Check fresh version at https   search maven org search q g org slf4j 20AND 20a slf4j-nop amp core gav  Simple binding  slf4j-simple      outputs all events to System err  Only messages of level INFO and higher are printed  This binding may be useful in the context of small applications    Check fresh version at https   search maven org search q g org slf4j 20AND 20a slf4j-simple amp core gav  Bindings for the logging frameworks  java util logging  logback  log4j   You need one of these bindings if you are going to write log to a file   See description and instructions at https   www slf4j org manual html projectDep    My opinion  I would recommend Logback because it s a successor to the log4j project   Check latest version of the binding for it at https   search maven org search q g ch qos logback 20AND 20a logback-classic amp core gav  You get console output out of the box but if you need to write logs into file just put FileAppender configuration to the src main resources logback xml or to the src test resources logback-test xml just like this    lt  xml version  1 0  encoding  UTF-8   gt   lt configuration gt       lt appender name  STDOUT  class  ch qos logback core ConsoleAppender  gt           lt  -- encoders are assigned the type              ch qos logback classic encoder PatternLayoutEncoder by default -- gt           lt encoder gt               lt pattern gt  d HH mm ss SSS    thread   -5level  logger 36  -  msg n lt  pattern gt           lt  encoder gt       lt  appender gt       lt appender name  FILE  class  ch qos logback core FileAppender  gt           lt file gt logs logs log lt  file gt            lt encoder gt               lt pattern gt  date  level   thread   logger 10  -  msg n lt  pattern gt           lt  encoder gt       lt  appender gt        lt root level  debug  gt           lt appender-ref ref  STDOUT    gt           lt appender-ref ref  FILE    gt       lt  root gt        lt logger level  DEBUG  name  com myapp   gt   lt  configuration gt     See detailed description in manual  https   logback qos ch manual configuration html

User · Answer

If you are using maven to dependency management so you can just add following dependency in pom xml   lt dependency gt       lt groupId gt org slf4j lt  groupId gt       lt artifactId gt slf4j-log4j12 lt  artifactId gt       lt version gt 1 5 6 lt  version gt   lt  dependency gt    For non-Maven users Just download the library and put it into your project classpath   Here you can see details  http   www mkyong com wicket java-lang-classnotfoundexception-org-slf4j-impl-staticloggerbinder

User · Answer

I got into this issue when I get the following error   SLF4J  Failed to load class  org slf4j impl StaticLoggerBinder   SLF4J  Defaulting to no-operation  NOP  logger implementation SLF4J  See http   www slf4j org codes html StaticLoggerBinder for further details    when I was using slf4j-api-1 7 5 jar in my libs   Inspite I tried with the whole suggested complement jars  like slf4j-log4j12-1 7 5 jar  slf4j-simple-1 7 5 the error message still persisted  The problem finally was solved when I added slf4j-jdk14-1 7 5 jar to the java libs    Get the whole slf4j package at http   www slf4j org download html

User · Answer

This is for those who came here from google search   If you use maven just add the following      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    Or       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-simple lt  artifactId gt          lt version gt 1 6 4 lt  version gt      lt  dependency gt

User · Answer

I know this post is a little old  but in case anyone else runs into this problem   Add slf4j-jdk14-X X X jar to your CLASSPATH  where X X X is the version number - e g  slf4j-jdk14-1 7 5 jar    HTH Peter

User · Answer

According to SLF4J official documentation      Failed to load class org slf4j impl StaticLoggerBinder      This warning message is reported when the   org slf4j impl StaticLoggerBinder class could not be loaded into   memory  This happens when no appropriate SLF4J binding could be found   on the class path  Placing one  and only one  of slf4j-nop jar    slf4j-simple jar  slf4j-log4j12 jar  slf4j-jdk14 jar or   logback-classic jar on the class path should solve the problem    Simply add this jar along with slf4j api jar to your classpath to get things done  Best of luck

User · Answer

I did not add any dependencies  I just change the way I was consuming them   Preview code   Uncomment this code if you are using elastic search version  lt  7 0   IndexRequest indexRequest   new IndexRequest     twitter      tweets     id    this is to make our consumer idempotent   source record value    XContentType JSON     Current code  IndexRequest indexRequest   new IndexRequest  tweets      source record value    XContentType JSON     id id      this is to make our consumer idempotent   I am using bulkrequest and with that I remove that error

User · Answer

the solution is indicated on their official website       Failed to load class org slf4j impl StaticLoggerBinder      This warning message is reported when the   org slf4j impl StaticLoggerBinder class could not be loaded into   memory  This happens when no appropriate SLF4J binding could be found   on the class path  Placing one  and only one  of slf4j-nop jar   slf4j-simple jar  slf4j-log4j12 jar  slf4j-jdk14 jar or   logback-classic jar on the class path should solve the problem  SINCE   1 6 0 As of SLF4J version 1 6  in the absence of a binding  SLF4J will default to a no-operation  NOP  logger implementation  If you are   responsible for packaging an application and do not care about   logging  then placing slf4j-nop jar on the class path of your   application will get rid of this warning message  Note that embedded   components such as libraries or frameworks should not declare a   dependency on any SLF4J binding but only depend on slf4j-api  When a   library declares a compile-time dependency on a SLF4J binding  it   imposes that binding on the end-user  thus negating SLF4J s purpose    solution   I have added to my project using maven research on intellij and i have chosen the slf4j-jdk14 jar

User · Answer

Please add the following dependencies to pom to resolve this issue    lt dependency gt     lt groupId gt org slf4j lt  groupId gt     lt artifactId gt slf4j-simple lt  artifactId gt     lt version gt 1 7 25 lt  version gt     lt scope gt test lt  scope gt   lt  dependency gt    lt dependency gt     lt groupId gt org slf4j lt  groupId gt     lt artifactId gt slf4j-api lt  artifactId gt     lt version gt 1 7 25 lt  version gt   lt  dependency gt

User · Answer

lt dependency gt           lt groupId gt org slf4j lt  groupId gt           lt artifactId gt slf4j-simple lt  artifactId gt           lt version gt 1 7 21 lt  version gt       lt  dependency gt    Put above mentioned dependency in pom xml file

User · Answer

Sometime we should see the note from the warnin SLF4J  See http   www slf4j org codes html StaticLoggerBinder for further details        This happens when no appropriate SLF4J binding could be found on the class path   You can search the reason why this warning comes  Adding one of the jar from  slf4j-nop jar  slf4j-simple jar  slf4j-log4j12 jar  slf4j-jdk14 jar or logback-classic jar  to the class path should solve the problem   compile  org slf4j slf4j-simple 1 6 1    for example add the above code to your build gradle or the corresponding code to pom xml for maven project

User · Answer

encountered the same problem on payara 5 191  jcl-over-slf4j together with slf4j-log4j12 solved the problem   lt properties gt     lt slf4j version gt 1 7 29 lt  slf4j version gt   lt  properties gt    lt dependency gt     lt groupId gt org slf4j lt  groupId gt     lt artifactId gt slf4j-api lt  artifactId gt     lt version gt   slf4j version  lt  version gt     lt type gt jar lt  type gt   lt  dependency gt     lt dependency gt     lt groupId gt org slf4j lt  groupId gt     lt artifactId gt jcl-over-slf4j lt  artifactId gt     lt version gt   slf4j version  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   slf4j version  lt  version gt   lt  dependency gt

User · Answer

In the Websphere case  you have an older version of slf4j-api jar  1 4 x  or 1 5 x lying around somewhere  The behavior you observe on tcServer  that is fail-over to NOP  occurs on slf4j versions 1 6 0 and later  Make sure that you are using slf4j-api-1 6 x jar on all platforms and that no older version of slf4j-api is placed on the class path

User · Answer

I added this dependency to resolve this issue   https   mvnrepository com artifact org slf4j slf4j-simple 1 7 25

User · Answer

I solve it adding this library  slf4j-simple-1 7 25 jar You can download this in official web https   www slf4j org download html

User · Answer

Slf4j is a facade for the underlying logging frameworks like log4j  logback  java util logging   To connect with underlying frameworks  slf4j uses a binding     log4j - slf4j-log4j12-1 7 21 jar java util logging - slf4j-jdk14-1 7 21 jar etc   The above error is thrown if the binding jar is missed  You can download this jar and add it to classpath   For maven dependency    lt dependency gt      lt groupId gt org slf4j lt  groupId gt     lt artifactId gt slf4j-log4j12 lt  artifactId gt     lt version gt 1 7 21 lt  version gt   lt  dependency gt    This dependency in addition to slf4j-log4j12-1 7 21 jar it will pull slf4j-api-1 7 21 jar as well as log4j-1 2 17 jar into your project  Reference  http   www slf4j org manual html

User · Answer

Simply add this to your pom xml    lt dependency gt     lt groupId gt org slf4j lt  groupId gt     lt artifactId gt slf4j-simple lt  artifactId gt     lt version gt 1 7 21 lt  version gt   lt  dependency gt

User · Answer

I had the same issue with WebSphere 6 1  As Ceki pointed out  there were tons of jars that WebSphere was using and one of them was pointing to an older version of slf4j  The No-Op fallback happens only with slf4j -1 6  so anything older than that will throw an exception and halts your deployment  There is a documentation in SLf4J site which resolves this  I followed that and added slf4j-simple-1 6 1 jar to my application along with slf4j-api-1 6 1 jar which I already had  If you use Maven  add the following dependencies  with   slf4j version  being the latest version of slf4j  lt dependency gt       lt groupId gt org slf4j lt  groupId gt       lt artifactId gt slf4j-api lt  artifactId gt       lt version gt   slf4j version  lt  version gt   lt  dependency gt   lt dependency gt       lt groupId gt org slf4j lt  groupId gt       lt artifactId gt slf4j-simple lt  artifactId gt       lt version gt   slf4j version  lt  version gt   lt  dependency gt   This solved my issue  Hope it helps others who have this issue

User · Answer

I am working in a project Struts2 Spring  So it need a dependency slf4j-api-1 7 5 jar   If I run the project  I am getting error like  Failed to load class  org slf4j impl StaticLoggerBinder    I solved my problem by adding the slf4j-log4j12-1 7 5 jar   So add this jar in your project to solve the issue

User · Answer

Quite a few answers here recommend adding the slf4j-simple dependency to your maven pom file  You might want to check for the most current version  At https   mvnrepository com artifact org slf4j slf4j-simple you ll find the latest version of the SLF4J Simple Binding  Pick the one that suites you best  still 1 7 30 from 2019-12  is the stable version as of 2020-10  and include it to your pom xml  For your convenience some dependencies are shown here - but they might not be up-to-date when you read this  Alpha Version of 2019-10  lt  -- https   mvnrepository com artifact org slf4j slf4j-simple -- gt   lt dependency gt      lt groupId gt org slf4j lt  groupId gt      lt artifactId gt slf4j-simple lt  artifactId gt      lt version gt 2 0 0-alpha1 lt  version gt    lt  dependency gt   Beta Version of Feb 2019  lt  -- https   mvnrepository com artifact org slf4j slf4j-simple -- gt   lt dependency gt       lt groupId gt org slf4j lt  groupId gt       lt artifactId gt slf4j-simple lt  artifactId gt       lt version gt 1 8 0-beta4 lt  version gt   lt  dependency gt   Stable Version 2019-12  lt  -- https   mvnrepository com artifact org slf4j slf4j-simple -- gt   lt dependency gt      lt groupId gt org slf4j lt  groupId gt      lt artifactId gt slf4j-simple lt  artifactId gt      lt version gt 1 7 30 lt  version gt   lt  dependency gt   I removed the scope test part thanks to the comment below

User · Answer

I was facing the similar problem with Spring-boot-2 applications with Java 9 library   Adding the following dependency in my pom xml solved the issue for me        lt dependency gt           lt groupId gt com googlecode slf4j-maven-plugin-log lt  groupId gt           lt artifactId gt slf4j-maven-plugin-log lt  artifactId gt           lt version gt 1 0 0 lt  version gt       lt  dependency gt

User · Answer

SLF4j is an abstraction for various logging frameworks  Hence apart from having slf4j you need to include any of your logging framework like log4j or logback  etc  in your classpath   To have an idea refer the First Baby Step in http   logback qos ch manual introduction html

User · Answer

You need to add following jar file in your classpath  slf4j-simple-1 6 2 jar  If you don t have it  please download it  Please refer to http   www slf4j org codes html multiple bindings

User · Answer

Here are my 5 cents    I had the same issues while running tests  So I ve fixed it by adding an implementation for the test runtime only  I m using gradle for this project      https   mvnrepository com artifact ch qos logback logback-classic testRuntimeOnly group   ch qos logback   name   logback-classic   version   1 2 3

User · Answer

As per the SLF4J Error Codes Failed to load class org slf4j impl StaticLoggerBinder This warning message is reported when the org slf4j impl StaticLoggerBinder class could not be loaded into memory  This happens when no appropriate SLF4J binding could be found on the class path  Placing one  and only one  of slf4j-nop jar slf4j-simple jar  slf4j-log4j12 jar  slf4j-jdk14 jar or logback-classic jar on the class path should solve the problem  Note that slf4j-api versions 2 0 x and later use the ServiceLoader mechanism  Backends such as logback 1 3 and later which target slf4j-api 2 x  do not ship with org slf4j impl StaticLoggerBinder  If you place a logging backend which targets slf4j-api 2 0 x  you need slf4j-api-2 x jar on the classpath  See also relevant faq entry  SINCE 1 6 0 As of SLF4J version 1 6  in the absence of a binding  SLF4J will default to a no-operation  NOP  logger implementation  If you are responsible for packaging an application and do not care about logging  then placing slf4j-nop jar on the class path of your application will get rid of this warning message  Note that embedded components such as libraries or frameworks should not declare a dependency on any SLF4J binding but only depend on slf4j-api  When a library declares a compile-time dependency on a SLF4J binding  it imposes that binding on the end-user  thus negating SLF4J s purpose

User · Answer

As an alternative to the jar inclusion and pure maven solutions  you can include it from maven with gradle   Example for version 1 7 25     https   mvnrepository com artifact org slf4j slf4j-simple api group   org slf4j   name   slf4j-simple   version   1 7 25    Put this within the dependencies of your build gradle file

User · Answer

I use Jena and I add the fellowing dependence to pom xml   lt dependency gt      lt groupId gt ch qos logback lt  groupId gt     lt artifactId gt logback-classic lt  artifactId gt     lt version gt 1 0 13 lt  version gt   lt  dependency gt    I try to add slf4j-simple but it just disappear the  SLF4J  Failed to load class    org slf4j impl StaticLoggerBinder     error but logback-classic show more detail infomation   The official document

User · Answer

put file slf4j-log4j12-1 6 4 jar in the classpath will do the trick

[java] SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder"

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