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https://issues.apache.org/jira/browse/LOG4J2-346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13738064#comment-13738064
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Remko Popma commented on LOG4J2-346:
------------------------------------
Roland, we are all volunteers working on log4j in our spare time. Another
factor is that we don't have much OSGi expertise in the team, so the quickest
way to get this fixed is to provide a patch yourself.
> Cyclic dependency in OSGi-context. Apache Log4j SLF4J Binding <-> slf4j-api
> ---------------------------------------------------------------------------
>
> Key: LOG4J2-346
> URL: https://issues.apache.org/jira/browse/LOG4J2-346
> Project: Log4j 2
> Issue Type: Bug
> Components: Core, SLF4J Bridge
> Affects Versions: 2.0-beta4, 2.0-beta8, 2.0-beta9
> Environment: OSGi R5 / Apache Felix 4.x
> Reporter: Roland Weiglhofer
> Labels: Bundle, CyclicDependency, OSGi
> Fix For: 2.0
>
>
> The bundle "Apache Log4j Core" (2.0.0.beta8) can not be resolved because the
> host-bundle is unresolved. The bundle "Apache Log4j SLF4J Binding"
> (2.0.0.beta8) has an unresolved dependency to the package org.slf4j which is
> exported by the slf4j-api bundle. The Slf4j-api bundle has also an unresolved
> dependency to the package org.slf4j.impl which is exported by the bundle
> "Apache Log4j SLF4J Binding". This is a cyclic dependency in OSGi-context.
> Without the slf4j-api everything works. But the Slf4j-api bundle is needed
> because of given dependencies of third-party-bundles. The "Apache Log4j SLF4J
> Binding" bundle should also export the package org.slf4j. I recommend to use
> a fragmented bundle.
> ----------------------------------------------------------------
> ID|State |Level|Name
> 0|Active | 0|System Bundle (4.2.1)
> 4|Active | 2|Apache Felix Bundle Repository (1.6.6)
> 5|Active | 2|Apache Felix Configuration Admin Service (1.6.0)
> 6|Active | 2|Apache Felix Gogo Command (0.12.0)
> 7|Active | 2|Apache Felix Gogo Runtime (0.10.0)
> 8|Active | 2|Apache Felix Gogo Shell (0.10.0)
> 9|Resolved | 2|Apache Felix Security Provider (2.2.0)
> 10|Active | 2|Apache Felix Shell Service (1.4.3)
> 11|Installed | 2|Apache Log4j 1.x Compatibility API (2.0.0.beta8)
> 12|Active | 2|Apache Log4j API (2.0.0.beta8)
> 13|Installed | 2|Apache Log4j Commons Logging Bridge (2.0.0.beta8)
> 14|Installed | 2|Apache Log4j Core (2.0.0.beta8)
> 15|Installed | 2|Apache Log4j SLF4J Binding (2.0.0.beta8)
> 16|Active | 2|cal10n-api (0.7.4)
> 17|Active | 2|Commons IO (2.4.0)
> 18|Active | 2|Commons Lang (2.6.0)
> 19|Active | 2|Data mapper for Jackson JSON processor (1.9.13)
> 20|Active | 2|Jackson JSON processor (1.9.13)
> 21|Active | 2|JSON.simple (1.1.1)
> 22|Installed | 2|slf4j-api (1.5.11)
> 23|Installed | 2|slf4j-ext (1.5.11)
> Unresolved constraint in bundle org.apache.logging.log4j-slf4j-impl [15]:
> Unable to resolve 15.0: missing requirement [15.0] osgi.wiring.package;
> (osgi.wiring.package=org.slf4j) [caused by: Unable to resolve 22.0: missing
> requirement [22.0] osgi.wiring.package;
> (&(osgi.wiring.package=org.slf4j.impl)(version>=1.5.5))]
> Unresolved constraint in bundle slf4j.api [22]: Unable to resolve 22.0:
> missing requirement [22.0] osgi.wiring.package;
> (&(osgi.wiring.package=org.slf4j.impl)(version>=1.5.5))
> Unresolved constraint in bundle org.apache.logging.log4j-jcl [13]: Unable to
> resolve 13.0: missing requirement [13.0] osgi.wiring.package;
> (osgi.wiring.package=org.apache.commons.logging) [caused by: Unable to
> resolve 3.0: missing requirement [3.0] osgi.wiring.package;
> (&(osgi.wiring.package=org.apache.logging.log4j.core)(version>=2.0.0)(!(version>=3.0.0)))
> [caused by: Unable to resolve 14.0: missing requirement [14.0]
> osgi.wiring.host;
> (&(osgi.wiring.host=org.apache.commons.log4j-api)(bundle-version>=2.0.0.beta8))]]
> Unresolved constraint in bundle org.apache.logging.log4j-1.2-api [11]: Unable
> to resolve 11.0: missing requirement [11.0] osgi.wiring.package;
> (osgi.wiring.package=org.apache.logging.log4j.core) [caused by: Unable to
> resolve 14.0: missing requirement [14.0] osgi.wiring.host;
> (&(osgi.wiring.host=org.apache.commons.log4j-api)(bundle-version>=2.0.0.beta8))]
> (bundle 14 (log4j core) can not be resolved because the host bundle is
> unresolved.)
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