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Asked: 2026-05-23T03:00:14+00:00

I am trying to compile an open source library, and meet the following problem.

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I am trying to compile an open source library, and meet the following problem. When I keep the two libraries, slf4j-jcl-1.6.0.jar and slf4j-api-1.6.0.jar, the eclipse compiler will give me the following error messages:

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/chengs6/mahout/mahout-distribution-0.5/mahout-examples-0.5-job.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/chengs6/mahout/mahout-distribution-0.5/lib/slf4j-jcl-1.6.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]

If I remove these two libraries, then the compiler will give me the following error messages:

Jun 15, 2011 2:51:12 PM org.slf4j.impl.JCLLoggerAdapter error

How to solve this issue? Thanks.

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1 Answer

  1. Editorial Team

    SLF4J only requires you to have slf4j-api-1.6.0.jar and one of the logger implementations in your classpath. This is what the manual says:

    Note that SLF4J-enabling your
    library/application implies the
    addition of only a single mandatory
    dependency, namely
    slf4j-api-1.6.1.jar.

    In your case I’d guess you have multiple logger implementations in your classpath. It looks to me like mahout-examples-0.5-job.jar already includes some SLF4J implementation classes.

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