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java.lang.NullPointerException: 	at java.util.LinkedList.remove(LinkedList.java:791)	at java.util.LinkedList.removeLast(LinkedList.java:144)	at org.ops4j.pax.logging.internal.LogReaderServiceImpl.cleanUp(LogReaderServiceImpl.java:87)	at org.ops4j.pax.logging.internal.LogReaderServiceImpl.fireEvent(LogReaderServiceImpl.java:80)	at org.ops4j.pax.logging.internal.PaxLoggingServiceImpl.handleEvents(PaxLoggingServiceImpl.java:143)	at org.ops4j.pax.logging.internal.PaxLoggerImpl.debug(PaxLoggerImpl.java:89)	at org.ops4j.pax.logging.internal.TrackingLogger.debug(TrackingLogger.java:80)	at org.apache.commons.logging.internal.JclLogger.debug(JclLogger.java:91)	at org.springframework.osgi.extender.internal.activator.ContextLoaderListener$BaseListener.bundleChanged(ContextLoaderListener.java:162)	at org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:1210)	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:195)	at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:141)	at org.eclipse.osgi.framework.internal.core.Framework.publishBundleEventPrivileged(Framework.java:1558)	at org.eclipse.osgi.framework.internal.core.Framework.publishBundleEvent(Framework.java:1509)	at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:355)	at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:350)	at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1118)	at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:634)	at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:508)	at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:282)	at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:468)	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:195)	at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:297)