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https://issues.apache.org/jira/browse/KARAF-3173?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Sicker resolved KARAF-3173.
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Resolution: Not a Problem
I figured out the problem. I had to make {{slf4j-api}} a provided dependency
instead of a compile dependency. That way everything works fine without
introducing a separate bundle dependency.
> Using SLF4J does not log anything
> ---------------------------------
>
> Key: KARAF-3173
> URL: https://issues.apache.org/jira/browse/KARAF-3173
> Project: Karaf
> Issue Type: Bug
> Components: karaf-core
> Affects Versions: 3.0.1
> Reporter: Matt Sicker
> Labels: logging, slf4j
>
> Here's the relevant parts of my {{org.ops4j.pax.logging.cfg}} file:
> {code}
> # File appender
> log4j.appender.out=org.apache.log4j.RollingFileAppender
> log4j.appender.out.layout=org.apache.log4j.PatternLayout
> log4j.appender.out.layout.ConversionPattern=%d{ABSOLUTE} | %-5.5p | %-16.16t
> | %-32.32c{1} | %X{bundle.id} - %X{bundle.name} - %X{bundle.version} | %m%n
> log4j.appender.out.file=${karaf.data}/log/karaf.log
> log4j.appender.out.append=true
> log4j.appender.out.maxFileSize=1MB
> log4j.appender.out.maxBackupIndex=10
> log4j.logger.com.peapod=DEBUG, out
> {code}
> Then, inside a bundle class, I have a private static final Logger from SLF4J.
> Doing the following won't log anything anywhere:
> {code}
> LOGGER.debug("Hello, world!");
> LOGGER.error("Not even this!");
> {code}
> Viewing the headers of my bundle show the following in the Import-Package
> attribute:
> {code}
> org.slf4j;version="[1.7,2)"
> {code}
> For the Pax logging API bundle, it has the following in its Export-Package
> attribute:
> {code}
> org.slf4j;uses:="org.slf4j.helpers,org.slf4j.spi";provider=paxlogging;version=1.7.1
> {code}
> The only way I've been able to log anything whatsoever has been to inject the
> OSGi LogService which shouldn't be required. I'm using OPS4J Pax Logging
> version 1.7.2 if that helps (the 1.7.1 is for SLF4J apparently).
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