When we attempt to profile our application, which runs in an Apache Felix OSGI container, using JProbe the Logback configuration fails with the following exception:

Failed to instantiate [ch.qos.logback.classic.LoggerContext]
Reported exception:
java.lang.IllegalArgumentException: name
at sun.misc.URLClassPath$Loader.findResource(URLClassPath.java:458)
at sun.misc.URLClassPath$1.next(URLClassPath.java:195)
at sun.misc.URLClassPath$1.hasMoreElements(URLClassPath.java:205)
at java.net.URLClassLoader$3$1.run(URLClassLoader.java:393)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader$3.next(URLClassLoader.java:390)
at java.net.URLClassLoader$3.hasMoreElements(URLClassLoader.java:415)
at sun.misc.CompoundEnumeration.next(CompoundEnumeration.java:27)
at sun.misc.CompoundEnumeration.hasMoreElements(CompoundEnumeration.java:36)
at sun.misc.CompoundEnumeration.next(CompoundEnumeration.java:27)
at sun.misc.CompoundEnumeration.hasMoreElements(CompoundEnumeration.java:36)
at ch.qos.logback.core.util.Loader.getResourceOccurenceCount(Loader.java:58)
at ch.qos.logback.classic.util.ContextInitializer.multiplicityWarning(ContextInitializer.java:131)
at ch.qos.logback.classic.util.ContextInitializer.statusOnResourceSearch(ContextInitializer.java:154)
at ch.qos.logback.classic.util.ContextInitializer.findConfigFileURLFromSystemProperties(ContextInitializer.java:88)
at ch.qos.logback.classic.util.ContextInitializer.findURLOfDefaultConfigurationFile(ContextInitializer.java:97)
at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:119)
at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:83)
at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:54)
at org.slf4j.LoggerFactory.getSingleton(LoggerFactory.java:230)
at org.slf4j.LoggerFactory.bind(LoggerFactory.java:121)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:112)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:275)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:248)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:261)
at com.example.csp.gui.interfaces.logger.ABCDGUILoggerImpl.getLogger(ABCDGUILoggerImpl.java:74)
at com.example.csp.gui.interfaces.logger.ABCDGUILoggerFactory.getLogger(ABCDGUILoggerFactory.java:51)
at com.example.csp.gui.kernel.util.ABCDGUIKernelUtil.<clinit>(ABCDGUIKernelUtil.java:61)
at com.example.csp.gui.kernel.context.impl.ABCDGUIKernelContextImpl.setAppBaseBundleInContext(ABCDGUIKernelContextImpl.java:207)
at com.example.csp.gui.kernel.context.impl.ABCDGUIKernelContextImpl.init(ABCDGUIKernelContextImpl.java:93)
at com.example.csp.gui.kernel.context.impl.ABCDGUIKernelContextImpl.<init>(ABCDGUIKernelContextImpl.java:58)
at com.example.csp.gui.kernel.activator.impl.KernelActivatorImpl.start(KernelActivatorImpl.java:101)
at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:589)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1458)
at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:984)
at org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl.java:263)
at java.lang.Thread.run(Thread.java:619)
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/ngawab/wab_code/code/source/wnb-common-bundles/wnb-common-client/startup-2.0.3/csp-gui-thickclient-bootstrap-2.0.3-all.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [bundle://4.0:1/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.

After which we get no logging at all.

I appreciate that this will be difficult to reproduce , and I think may be related to the "bundle://" URL format not being recognised, so I had a look at the code in
ch.qos.logback.classic.util.ContextInitializer.multiplicityWarning()
Currently it catches an IOExeception when calling Loader.getResourceOccurenceCount(), however from the stack trace this can also throw an. IllegalArgumentException

So could :

try

{ urlList = Loader.getResourceOccurenceCount(resourceName, classLoader); } catch (IOException e) { sm.add(new ErrorStatus("Failed to get url list for resource [" + resourceName + "]", loggerContext, e)); }

Become:

try { urlList = Loader.getResourceOccurenceCount(resourceName, classLoader); }

catch (Exception e)

{ sm.add(new ErrorStatus("Failed to get url list for resource [" + resourceName + "]", loggerContext, e)); }

I did try this in our environment , and the logging did get successfully configured after this change ( although it wasn't pretty.... :-> )