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https://issues.apache.org/jira/browse/JENA-583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14039657#comment-14039657
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Hendy Irawan commented on JENA-583:
-----------------------------------
BTW I still don't get why Jena needs to depend with optional=false?
Even if Jena command line tools require a logging backend, Jena JARs can be
built with log4j dependencies set to {{<optional>true</optional>}} .
AFAIK the only time explicit dependency to logging backend is required is when
building the Jena distro (zip/tar.gz) but I think at that stage you're already
copying JARs into the {{lib}} directory anyway so might as well put log4j stuff
there?
> Get rid of log4j dependency in jena-core
> ----------------------------------------
>
> Key: JENA-583
> URL: https://issues.apache.org/jira/browse/JENA-583
> Project: Apache Jena
> Issue Type: Improvement
> Components: Jena
> Affects Versions: Jena 2.11.0
> Reporter: Francis De Brabandere
> Labels: logging
>
> Apache jena core seems to pull in log4j and slf4j-log4j12, since you use
> slf4j I would suppose I can plug in my own logging backend. If you have a
> hard dependency on log4j at least make it optional and don't force it in the
> core jena components.
> Ultimately this avoids these kinds of issues:
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:.../target/universal/stage/lib/ch.qos.logback.logback-classic-1.0.13.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:.../target/universal/stage/lib/org.slf4j.slf4j-log4j12-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> SLF4J: Actual binding is of type
> [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
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