SLF4J Failed to load class org slf4j impl StaticLoggerBinder in a Maven Project

Question

I have a dependency for SLF4J  I am getting this 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    Here is my maven entry        lt dependency gt           lt groupId gt org slf4j lt  groupId gt           lt artifactId gt slf4j-api lt  artifactId gt           lt version gt 1 6 6 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 6 6 lt  version gt       lt  dependency gt       lt dependency gt           lt groupId gt log4j lt  groupId gt           lt artifactId gt log4j lt  artifactId gt           lt version gt 1 2 16 lt  version gt       lt  dependency gt    Where is the problem     EDIT   Without log4j dependency I get the following exception  Failed to instantiate SLF4J LoggerFactory Reported exception  java lang NoClassDefFoundError  org slf4j impl StaticLoggerBinder     at org slf4j LoggerFactory bind LoggerFactory java 121      at org slf4j LoggerFactory performInitialization LoggerFactory java 111      at org slf4j LoggerFactory getILoggerFactory LoggerFactory java 268      at org slf4j LoggerFactory getLogger LoggerFactory java 241      at org slf4j LoggerFactory getLogger LoggerFactory java 254      at org apache bval jsr303 ConfigurationImpl  lt clinit gt  ConfigurationImpl java 50      at java lang J9VMInternals initializeImpl Native Method      at java lang J9VMInternals initialize J9VMInternals java 228      at org apache bval jsr303 ApacheValidationProvider createGenericConfiguration ApacheValidationProvider java 66      at javax validation Validation GenericBootstrapImpl configure Validation java 173      at javax validation Validation buildDefaultValidatorFactory Validation java 50      at com daimler zv9 basic entity AbstractEntity  lt clinit gt  AbstractEntity java 73      at java lang J9VMInternals initializeImpl Native Method      at java lang J9VMInternals initialize J9VMInternals java 228      at java lang J9VMInternals initialize J9VMInternals java 195      at java lang Class forNameImpl Native Method      at java lang Class forName Class java 168      EDIT2  It is an example MAVEN Tree that I get   INFO  com myCompany abc ABC Document ejb 0 0 1-SNAPSHOT  INFO   - com myCompany abc ABC Basic jar 0 0 1-SNAPSHOT compile  INFO   - com myCompany iap javax j2ee jar 5 0 0 provided  INFO   - com myCompany iap logging jar 5 0 0 provided  INFO   - com myCompany iap util jar 5 0 0 provided  INFO   - junit junit jar 4 8 2 test  INFO   - javax servlet jstl jar 1 2 provided  INFO   - org slf4j slf4j-api jar 1 6 6 compile  INFO   - org slf4j slf4j-simple jar 1 6 6 compile  INFO   - org mockito mockito-all jar 1 9 0 test

User · Answer

The message you mention is quite clear   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    SLF4J API could not find a binding  and decided to default to a NOP implementation  In your case slf4j-log4j12 jar was somehow not visible when the LoggerFactory class was loaded into memory  which is admittedly very strange  What does  mvn dependency tree  tell you   The various dependency declarations may not even be directly at cause here  I strongly suspect that a pre-1 6 version of slf4j-api jar is being deployed without your knowledge

User · Answer

I am assuming you are using Eclipse as your developing environment   Eclipse Juno  Indigo and Kepler when using the bundled maven version m2e   are not suppressing the message SLF4J  Failed to load class  org slf4j impl StaticLoggerBinder   This behaviour is present from the m2e version 1 1 0 20120530-0009 and onwards    Although  this is indicated as an error your logs will be saved normally  The highlighted error will still be present until there is a fix of this bug  More about this in the m2e support site   The current available solution is to use an external maven version rather than the bundled version of Eclipse  You can find about this solution and more details regarding this bug in the question below which i believe describes the same problem you are facing   SLF4J  Failed to load class  quot org slf4j impl StaticLoggerBinder quot   error

User · Answer

I ran into this in IntelliJ and fixed it by adding the following to my pom    lt  -- logging dependencies -- gt       lt dependency gt           lt groupId gt ch qos logback lt  groupId gt           lt artifactId gt logback-classic lt  artifactId gt           lt version gt   logback version  lt  version gt           lt exclusions gt               lt exclusion gt                   lt  -- Defined below -- gt                   lt artifactId gt slf4j-api lt  artifactId gt                   lt groupId gt org slf4j lt  groupId gt               lt  exclusion gt           lt  exclusions 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   slf4j version  lt  version gt       lt  dependency gt

User · Answer

Remove   lt dependency gt       lt groupId gt log4j lt  groupId gt       lt artifactId gt log4j lt  artifactId gt       lt version gt 1 2 16 lt  version gt   lt  dependency gt     slf4j-log4j12 is the log4j binding for slf4j you dont need to add another log4j dependency   Added Provide the log4j configuration in log4j properties and add it to your class path  There are sample configurations here  or you can change your binding to   lt dependency gt       lt groupId gt org slf4j lt  groupId gt       lt artifactId gt slf4j-simple lt  artifactId gt       lt version gt 1 6 1 lt  version gt   lt  dependency gt    if you are configuring slf4j due to some dependencies requiring it

[java] SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". in a Maven Project

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