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https://issues.apache.org/jira/browse/JCR-4796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17553531#comment-17553531
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Julian Reschke commented on JCR-4796:
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Thanks, Konrad.
Trying to explain again...: Jackrabbit modules use the SLF4J API. This is a
*compile* time dependency. At *runtime*, they need an implementation of that
API. This gives you the ability to use whatever logger you want (as long there
is a SLF4H binding for it).
Jackrabbit modules in general do not include a binding at all, except when it's
needed for the purposes of the module (such as standalone JAR, or a demo
webapp project). It's probably best to assemble the modules that you really
need in a separate project instead of relying on what we have put into a demo
project in the past.
> Remove slf4j from Jackrabbit libraries
> --------------------------------------
>
> Key: JCR-4796
> URL: https://issues.apache.org/jira/browse/JCR-4796
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Reporter: Graham Leggett
> Priority: Major
>
> Life is too short to deal with exceptions like this one:
> java.lang.LinkageError: loader constraint violation: when resolving method
> 'org.slf4j.ILoggerFactory
> org.slf4j.impl.StaticLoggerBinder.getLoggerFactory()' the class loader
> org.apache.catalina.loader.ParallelWebappClassLoader @4bd217c of the current
> class, org/slf4j/LoggerFactory, and the class loader java.net.URLClassLoader
> @7907ec20 for the method's defining class, org/slf4j/impl/StaticLoggerBinder,
> have different Class objects for the type org/slf4j/ILoggerFactory used in
> the signature (org.slf4j.LoggerFactory is in unnamed module of loader
> org.apache.catalina.loader.ParallelWebappClassLoader @4bd217c, parent loader
> java.net.URLClassLoader @7907ec20; org.slf4j.impl.StaticLoggerBinder is in
> unnamed module of loader java.net.URLClassLoader @7907ec20, parent loader
> 'app')
> Remove slf4j and replace with the java default behaviour.
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