Failed to load class "org.slf4j.impl.StaticLoggerBinder"

[efranca]

I am testing the library and it works just fine in dev, but when I run my jar I get this:

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.

Should slf4j dependencies (below) be added manually in order to work out?

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>${version}</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>${version}</version>
</dependency>

Thanks!

[efranca]

Due to this conflict (warning)

[WARNING] [io.quarkus.deployment.pkg.steps.JarResultBuildStep] Dependencies with duplicate files detected. The dependencies [ch.qos.logback:logback-classic::jar:1.2.10[paths: /home/me/.m2/repository/ch/qos/logback/logback-classic/1.2.10/logback-classic-1.2.10.jar;], org.jboss.slf4j:slf4j-jboss-logmanager::jar:1.1.0.Final[paths: /home/me/.m2/repository/org/jboss/slf4j/slf4j-jboss-logmanager/1.1.0.Final/slf4j-jboss-logmanager-1.1.0.Final.jar;]] contain duplicate files, e.g. org/slf4j/impl/StaticMDCBinder.class

I had added this exclusion

<dependency>
      <groupId>io.quarkiverse.logging.logback</groupId>
      <artifactId>quarkus-logging-logback</artifactId>
      <version>0.10.0</version>
      <exclusions>
        <exclusion>
          <groupId>org.jboss.slf4j</groupId>
          <artifactId>slf4j-jboss-logmanager</artifactId>
        </exclusion>
      </exclusions> 
    </dependency>

and apparently it was good. In fact, It works just fine in DEV mode only. When I run the uber-jar it does not work as expected and throws the exception below

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.

If I comment out the exclusion above (for slf4j-jboss-logmanager) the LOGBACK works, but the WARNING duplicate is back.

I'll have to live with this warning if I want to use logback in prod.

[stuartwdouglas]

Do you have a reproducer?

[efranca]

yes, would you mind taking a look at? it's here: https://github.com/efranca/quarkus-logback-demo

[mmitya]

Hi, any workaround for this, please?
I can reproduce with:

• quarkus-logging-logback 0.4.0
• quarkus 2.2.0

It looks like StaticLoggerBinding from logback is ignored and not packaged into uberjar.