Chetan Mehrotra created SLING-3913:
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Summary: 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
Fix For: Commons Log 4.0.2
Logging fails to work 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
{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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