SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder” Ask Question

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.

I've checked the classpaths of both application servers and there is no other slf4j jar.

Does anyone have any ideas about what may be happening here?

Answer 1

The reason behind this error is that there were tons of jars that WebSphere was using and one of them was aiming to an older version of slf4j.

The No-Op rollback occurs only with slf4j -1.6+ so anything older than that will deliver an objection and reduces your deployment.

There's documentation in the SLf4J site that resolves this. I followed that and attached slf4j-simple-1.6.1.jar to my application accompanying with slf4j-API-1.6.1.jar which I already had.

I hope this will solve your issue.