here is the stack trace (xwiki.log)

 [EvictionTimer-4] WARN  eviction.EvictionTimerTask      - Eviction task
encountered an unexpected error 
java.lang.NullPointerException
        at org.apache.log4j.Category.isEnabledFor(Category.java:749)
        at
org.apache.commons.logging.impl.Log4JLogger.isTraceEnabled(Log4JLogger.java:333)
        at
org.jboss.cache.eviction.EvictionTimerTask.processRegions(EvictionTimerTask.java:102)
        at
org.jboss.cache.eviction.EvictionTimerTask.access$100(EvictionTimerTask.java:42)
        at
org.jboss.cache.eviction.EvictionTimerTask$Task.run(EvictionTimerTask.java:135)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at
java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)


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