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https://issues.apache.org/jira/browse/KARAF-2238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13663865#comment-13663865
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Jean-Baptiste Onofré commented on KARAF-2238:
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I discussed with Guillaume about that.
1/ thanks for Pax Logging 1.7.0 (and the support of OSGi services
"registration"), it's possible to create a logback appender that implement an
interface provided by pax-logging, and register it as a service. This part
should be documented.
2/ on the other hand, an interesting improvement can be added to pax-logging: a
wrapper that implements the pax-logging interface using an existing appender.
> Logback appender
> ----------------
>
> Key: KARAF-2238
> URL: https://issues.apache.org/jira/browse/KARAF-2238
> Project: Karaf
> Issue Type: Improvement
> Reporter: Keren Dong
>
> Can we have logback as the default logging implementation of
> pax-logging-service and have a way to load custom appender?
> We want to create a log appender with custom threading control and found that
> we can't with log4j 1.x (https://issues.apache.org/jira/browse/LOG4J2-3).
> Karaf's pax-logging-service uses (slf4j+log4j), so we replaced
> pax-logging-logback. But we find it difficult to do because
> pax-logging-logback embeds Logback jars inside the bundle without exporting
> packages and faced with osgi class loading issues. We can do it by defining
> custom appender fragment for pax-logging-logback host at startup.properties
> and set the org.ops4j.pax.logging.cfg for logback configuration. But we find
> that is not convenient for development for having to copy updated Jars to
> <kavaf_home>/system folder in every iteration.
> We are wondering if there is better way dynamically add the appender when we
> install our bundle on a standard Karaf distribution?
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