ClassNotFoundException org slf4j LoggerFactory

Question

I am trying to run GWT RequestFactory and facing this error   ClassNotFoundException  org slf4j LoggerFactory   I have tried to download slf4j-api-1 3 1 jar but it didnt resolve the issue   Any idea exactly which jar I need to download

User · Answer

I got this problem too and I fixed it in this way. I was trying to run mapreduce job locally through Eclipse, after set the configurations, I met this error (in Linux, Virtual Box) To solve it,

right click on the project you want to run,
go "Properties"->"Java Build Path"->"Add External Jars",
then go to file:/usr/lib/Hadoop/client-0.20, choose the three jars named started by "slf4j".

Then you'll be able to run the job locally. Hope my experience will help someone.

User · Answer

For a bit more explanation  keep in mind that the  I  in  api  is interface   The slf4j-api jar only holds the needed interfaces  actually LoggerFactory is an abstract class    You also need the actual implementations  an example of which  as noted above  can be found in slf4j-simple    If you look in the jar  you ll find the required classes under the  org slf4j impl  package

User · Answer

Better to always download as your first try  the most recent version from the developer s site   I had the same error message you had  and by downloading the jar from the above  slf4j-1 7 2 tar gz most recent version as of 2012OCT13   untarring  uncompressing  adding  2 jars to build path in eclipse  or adding to classpath in comand line     slf4j-api-1 7 2 jar slf4j-simple-1 7 2 jar   I was able to run my program

User · Answer

add this dependency https   mvnrepository com artifact org slf4j slf4j-api 1 7 28  will help fix error

User · Answer

Try downloading jar from here  You can find  it holds the class you need   EDIT  Seems like the website has changed its structure  You need to choose which jar file you need for your project   For slf4j-api jar file for latest version as of now  please visit this link  For slf4j-simple jar file for latest version as of now  please visit this link

User · Answer

Add the following JARs to the build path or lib folder of the project    slf4j-api-1 7 2 jar slf4j-jdk14-1 7 2 jar

User · Answer

It needs  slf4j-simple-1 7 2 jar  to resolve the problem   I downloaded a zip file  slf4j-1 7 2 zip  from http   slf4j org download html  I extracted the zip file and i got slf4j-simple-1 7 2 jar

User · Answer

I had the same on Android  This is how i fixed it   including ONLY the file   slf4j-api-1 7 6 jar  in my libs  folder  Having any additional slf4j  file  caused the NoClassDefFoundError   Obviously  the rest of the libs can be there  android-support-v4  etc   Versions  Eclipse Kepler 2013 06 14 - 02 29 ADT 22 3 Android SDK  4 4 2  Hope someone saves the time i wasted thanks to this

User · Answer

You ll need to download SLF4J s jars from the official site as either a zip  v1 7 4  or tar gz  v1 7 4   The download contains multiple jars based on how you want to use SLF4J  If you re simply trying to resolve the requirement of some other library  GWT  I assume  and don t really care about using SLF4J correctly  then I would probably pick the slf4j-api-1 7 4 jar since the Simple jar suggested by another answer does not contain  to my knowledge  the specific class you re looking for

User · Answer

i know this is an old Question   but i faced this problem recently and i looked for it in google   and i came across this documentation here from slf4j website   as it describes the following    This error 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   Hope that will help someone

[java] ClassNotFoundException: org.slf4j.LoggerFactory

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