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https://issues.apache.org/jira/browse/SLING-3913?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chetan Mehrotra resolved SLING-3913.
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Resolution: Later
Fix Version/s: (was: Commons Log 4.0.4)
The above error is just a warning seen in log but logging would still work.
With some work the warning can be avoided. For now no plan to address that so
resolving as {{Later}}. If required the issue can be reopened later
> Sling Logging fails to work in Eclipse Virgo
> --------------------------------------------
>
> Key: SLING-3913
> URL: https://issues.apache.org/jira/browse/SLING-3913
> Project: Sling
> Issue Type: Bug
> Components: Commons
> Affects Versions: Commons Log 4.0.0
> Reporter: Chetan Mehrotra
> Assignee: Chetan Mehrotra
> Priority: Minor
>
> Logging fails to work initially in SAP NetWeaver environment which run on top
> of OSGi using Eclipse Virgo which already use Logback. Following error is
> seen in app server logs. Note that evetually later logging does work, just
> that initial few logs which are generated before Sling Logging bundle gets
> started are lost
> {noformat}
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##Reported
> exception:|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##java.lang.ClassNotFoundException:
> org.eclipse.virgo.medic.log.logback.DelegatingContextSelector not found by
> org.apache.sling.commons.log [14]|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at
> org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1550)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at
> org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:77)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at
> org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1973)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at java.lang.ClassLoader.loadClass(ClassLoader.java:415)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at java.lang.Class.forName0(Native Method)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at java.lang.Class.forName(Class.java:186)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at ch.qos.logback.core.util.Loader.loadClass(Loader.java:185)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at
> ch.qos.logback.classic.util.ContextSelectorStaticBinder.dynamicalContextSelector(ContextSelectorStaticBinder.java:97)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at
> ch.qos.logback.classic.util.ContextSelectorStaticBinder.init(ContextSelectorStaticBinder.java:72)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:93)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at
> org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:55)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at org.slf4j.LoggerFactory.bind(LoggerFactory.java:129)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at
> org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:108)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:302)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:276)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:288)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at
> org.apache.sling.installer.provider.file.impl.ServicesListener.<init>(ServicesListener.java:45)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at
> org.apache.sling.installer.provider.file.impl.Activator.start(Activator.java:66)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at
> org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at org.apache.felix.framework.Felix.activateBundle(Felix.java:2152)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at org.apache.felix.framework.Felix.startBundle(Felix.java:2070)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at
> org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1297)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at
> org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:304)|
> 2014 09 04
> 06:43:32#+00#ERROR#System.err##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##
> at java.lang.Thread.run(Thread.java:789)|
> 2014 09 04
> 06:48:05#+00#INFO#System.out##anonymous#FelixStartLevel##adsdev#deployedauthor1#web##Attempting
> to load ESAPI.properties via file I/O.|
> {noformat}
> Logback has some [discovery
> mechanism|http://logback.qos.ch/manual/contextSelector.html] where it looks
> for a system property {{logback.ContextSelector}} and loads the configured
> class if set. As SAP NetWeaver Cloud internally uses Eclipse Virgo which also
> uses Logback it has set a value for that system property and that causes the
> issue.
> As a fix we should disable this discovery logic in Logback
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