hence loggerCache.get(name) could fail (NPE) in line 117:

java.lang.NullPointerException
at java.util.Hashtable.get(Hashtable.java:336)
at ch.qos.logback.classic.LoggerContext.getLogger(LoggerContext.java:117)
at ch.qos.logback.classic.LoggerContext.getLogger(LoggerContext.java:44)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:88)
at org.apache.sling.osgi.log.LogSupport.getLogger(LogSupport.java:322)
at org.apache.sling.osgi.log.LogSupport.logOut(LogSupport.java:333)
at org.apache.sling.osgi.log.LogSupport.fireLogEvent(LogSupport.java:167)
at org.apache.sling.osgi.log.LogSupport.bundleChanged(LogSupport.java:216)
at org.apache.felix.framework.util.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:690)
at org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:619)
at org.apache.felix.framework.util.EventDispatcher.run(EventDispatcher.java:816)
at org.apache.felix.framework.util.EventDispatcher.access$000(EventDispatcher.java:42)
at org.apache.felix.framework.util.EventDispatcher$1.run(EventDispatcher.java:94)
at java.lang.Thread.run(Thread.java:613)