java lang NoClassDefFoundError org slf4j LoggerFactory

Question

I am getting the error as mentioned below  while running the feed utility  I am trying to load an image  logo png   The slf4j jar file is also available in the runtime classpath  But still I am getting this error    Oct 16  2012 7 34 11 PM com ibm commerce foundation dataload FeedRetriever  invokeDataLoad SEVERE  An error occurred while performing data load  Throwable occurred  com ibm commerce foundation dataload exception DataLoadException   An error occurred while executing the data load    java lang NoClassDefFoundError  org slf4j LoggerFactory      at com ibm commerce foundation dataload DataLoaderMain execute DataLoaderMain java 664      at com ibm commerce content commands DataLoadInvoker execute DataLoadInvoker java 101      at com ibm commerce foundation dataload FeedRetriever invokeDataLoad FeedRetriever java 244      at com ibm commerce foundation dataload FeedRetriever execute FeedRetriever java 172      at com ibm commerce foundation dataload FeedRetriever main FeedRetriever java 321  Caused by  java lang RuntimeException  java lang NoClassDefFoundError  org slf4j LoggerFactory     at com ibm commerce foundation dataload DataLoaderMain execute DataLoaderMain java 488          4 more Caused by  java lang NoClassDefFoundError  org slf4j LoggerFactory     at org apache wink client ClientConfig  lt clinit gt  ClientConfig java 52      at java lang J9VMInternals initializeImpl Native Method      at java lang J9VMInternals initialize J9VMInternals java 200      at java lang J9VMInternals initialize J9VMInternals java 167      at com ibm commerce foundation dataload feedreader AtomReader getFeed AtomReader java 104      at com ibm commerce foundation dataload feedreader AtomReader getEntries AtomReader java 147      at com ibm commerce foundation dataload feedreader AtomReader getEntries AtomReader java 1      at com ibm commerce foundation dataload feedreader BaseFeedReader init BaseFeedReader java 252      at com ibm commerce foundation dataload AbstractBusinessObjectLoader initializeDataReaders AbstractBusinessObjectLoader java 1344      at com ibm commerce foundation dataload AbstractBusinessObjectLoader init AbstractBusinessObjectLoader java 369      at com ibm commerce foundation dataload BusinessObjectLoader init BusinessObjectLoader java 65      at com ibm commerce foundation dataload DataLoaderMain execute DataLoaderMain java 431          4 more Caused by  java lang ClassNotFoundException  org slf4j LoggerFactory     at java lang ClassNotFoundException  lt init gt  ClassNotFoundException java 76      at java net URLClassLoader findClass URLClassLoader java 396      at java lang ClassLoader loadClass ClassLoader java 660      at sun misc Launcher AppClassLoader loadClass Launcher java 358      at java lang ClassLoader loadClass ClassLoader java 626          16 more Oct 16  2012 7 34 11 PM com ibm commerce foundation dataload FeedRetriever main SEVERE  An error occurred while performing data load  Throwable occurred  com ibm commerce foundation dataload exception DataLoadException  An error has occurred   If this problem persists  contact product support      at com ibm commerce foundation dataload FeedRetriever invokeDataLoad FeedRetriever java 247      at com ibm commerce foundation dataload FeedRetriever execute FeedRetriever java 172      at com ibm commerce foundation dataload FeedRetriever main FeedRetriever java 321

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The LoggerFactory class is msising according to the error message      java lang NoClassDefFoundError  org slf4j LoggerFactory   Apparently  the slf4j jar file is not getting loaded for some reason

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Right click on project properties and follow below steps Project Properties  --   Deployment Assembly   adding  Java Build Path Entries -  Maven Dependencies

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get the compatible version of this jar slf4j-jdk14 and add it as a dependency  this solved the problem for me

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I also had the similar problem  I had a maven project and was testing rabbitmq  Firstly it showed me the similar error then I added all the SLF4J dependencies in the maven project and then error changed to  Maven SLF4J  Class path contains multiple SLF4J bindings   Here is the complete list of dependencies from pom xlm    lt dependencies gt       lt dependency gt           lt groupId gt com rabbitmq lt  groupId gt           lt artifactId gt amqp-client lt  artifactId gt           lt version gt 4 0 0 lt  version gt       lt  dependency gt       lt dependency gt           lt groupId gt org apache commons lt  groupId gt           lt artifactId gt commons-lang3 lt  artifactId gt           lt version gt 3 0 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 7 21 lt  version gt          lt scope gt compile lt  scope gt       lt  dependency gt   lt  dependencies gt     It worked finally

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When you copy dependency from maven repository there is    lt scope gt test lt  scope gt    Try to remove it from dependencies in pom xml like this    lt  -- https   mvnrepository com artifact ch qos logback logback-classic -- gt   lt dependency gt       lt groupId gt ch qos logback lt  groupId gt       lt artifactId gt logback-classic lt  artifactId gt       lt version gt 1 2 3 lt  version gt   lt  dependency gt    This works for me  I hope it would be helpful for someone else

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this worked for me  properties maven uncheck resolve dependencies from Workspace projects

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Download slf4j-1 7 5 zip   It holds different jar files   Go to -  Integration folder after extracting zip and include following jar files   slf4j-api-2 0 99 slf4j-simple-1 6 99 junit-3 8 1

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When we use the slf4j api jar  we need any of the logger implementations like log4j  On my system  we have the complete set and it works fine   1  slf4j-api-1 5 6 jar 2  slf4j-log4j12-1 5 6 jar 3    log4j-1 2 15 jar

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I believe the answer is outlined on the slf4j web-site  Failed to load class org slf4j impl StaticLoggerBinder   For a very quick solution I suggest adding no-operation  NOP  logger implementation  slf4j-nop jar   For example  if using maven    lt dependency gt       lt groupId gt org slf4j lt  groupId gt       lt artifactId gt slf4j-nop lt  artifactId gt       lt version gt   slf4j-nop-version  lt  version gt   lt  dependency gt

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Add a SLF4J implementation  as you only have its API     lt dependency gt       lt groupId gt org slf4j lt  groupId gt       lt artifactId gt slf4j-log4j12 lt  artifactId gt       lt version gt 1 7 26 lt  version gt   lt  dependency gt

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Add the following jars to the class path or lib folder   slf4j-api-1 7 2 jar slf4j-jdk14-1 7 2 jar

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I was facing a similar issue and below line fixed the issue for me        lt dependency gt           lt groupId gt org slf4j lt  groupId gt           lt artifactId gt slf4j-api lt  artifactId gt       lt  dependency gt    Edit  I realized that I was using spring boot and the version of the dependency was getting pulled from spring-boot-starter-parent

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You have to provide one of the various SLF4J implementation  jar files in the classpath  as well as the interface  jar file  This is documented

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If you are facing java lang NoClassDefFoundError  org slf4j LoggerFactory Add slf4j-log4j12 jar in the library folder of the project

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You need slf4j-api library  For most cases only slf4j-api and slf4j-jkd14 are only required   Here you can download the version 1 7 2   slf4j-api-1 7 2 jar slf4j-jkd14-1 7 2jar   If you need an example to see how these are used  refers to this tutorial   http   www ibm com developerworks java library j-hangman-app index html  All the code for the tutorial is available

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The perfect solution which works undoubtedly is to just add these packages to your app  https   mvnrepository com artifact org slf4j slf4j-api 1 7 2  http   archive apache org dist logging log4j 1 2 16    after adding so you may encounter following WARNING which you can simply ignore   SLF4J  No SLF4J providers were found  SLF4J  Defaulting to no-operation  NOP  logger implementation SLF4J  See http   www slf4j org codes html noProviders for further details   credits  https   www javacodegeeks com 2018 02 fix-exception-thread-main-java-lang-noclassdeffounderror-org-slf4j-loggerfactory-java html

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First  check the dependency hierarchy than to exclude all slf4j jars from other dependencies and add separate slf4j as dependencies

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You can use bellow dependency   lt dependency gt           lt groupId gt log4j lt  groupId gt           lt artifactId gt log4j lt  artifactId gt           lt version gt 1 2 17 lt  version 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 7 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 7 lt  version gt       lt  dependency gt

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To be more specific if you are missing the class com vaadin external org slf4j LoggerFactory add the below dependency    lt dependency gt       lt groupId gt com vaadin external slf4j lt  groupId gt       lt artifactId gt vaadin-slf4j-jdk14 lt  artifactId gt       lt version gt 1 6 1 lt  version gt   lt  dependency gt    If you are missing any other org slf4j LoggerFactory  just go to Maven central class name search and search for the exact class name to determine what exact dependency you are missing

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use maven it will download all the required jar files for you   in this case you need the below jar files   slf4j-log4j12-1 6 1 jar slf4j-api-1 6 1 jar  These jars will also depend on the cassandra version which you are running   There are dependencies with cassandra version   jar version and jdk version you use   You can use   jdk1 6 with   cassandra 1 1 12 and the above jars

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make sure your MANIFEST MF contains the name of the referenced jar in my application was slf4j-api-   jar

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You need slf4j-api library and slf4j-log4j12-1 7 25 jar  Copy this jars in your project-  WEBINF-  lib folder and in tomcat server lib folder to execute successfully

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I tried other solutions and the exception didn t go away  So I decompiled the entire jose4j 0 6 5 jar with a Java Decomplier and look at its pom xml   I realised it has a specific dependency on slf4j-api  version 1 7 21    So in my project s pom xml  I added the exact same dependency  updated my Maven project so that it downloads this jar into my repository and the exception was gone   However it may bring up another error caused by slf4j itself   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    To overcome this issue  I added the following into my project s pom xml  So altogether you need to add the following to your pom xml and my jose4j ran without anymore issues    lt dependency gt       lt groupId gt org slf4j lt  groupId gt       lt artifactId gt slf4j-api lt  artifactId gt       lt version gt 1 7 21 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    Remember to update your Maven project after amending your pom xml    Right-click Project folder in Eclipse - gt  Maven - gt  Update Project

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This error occurs because of referenced jars are not checked in our project s order and export tab   Choose Project - ALT Enter- Java Build Path - Order and Export- check necessary jar files into  your project   Finally clean your project and run It will run successfully

[java] java.lang.NoClassDefFoundError: org.slf4j.LoggerFactory

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