Hi, I am trying to use logback in an eclipse plugin. I wrapped logback-access-1.1.3.jar, logback-core-1.1.3.jar, logback-classic-1.1.3.jar in an clipse plugin project. (Export-Package: ch.qos.logback.core, ch.qos.logback.classic, ch.qos.logback.access ) I wrapped slf4j-api-1.7.12.jar in an eclipse plugin project, with Export-Package: org.slf4j, added dependency to the above:(Require-Bundle: LogbackAsPlugin;bundle-version="1.0.0") Added dependencies to the above plugins in my plugin project. I got: 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. Found a hint in the web indicating that adding slf4j-simple jar to the dependencies might help, did add slf4j-simple-1.7.12.jar to my SLF4J wrapper plugin, now I get: SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [bundleresource://4.fwk1183888521/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [bundleresource://4.fwk1183888521:1/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. SLF4J: Actual binding is of type [org.slf4j.impl.SimpleLoggerFactory] Still no log messages are written. Thanks in advance for any help Regards, Arne