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java.lang.NullPointerException: 	at org.apache.aries.jpa.container.impl.PersistenceBundleManager$ProviderServiceComparator.compare(PersistenceBundleManager.java:575)	at org.apache.aries.jpa.container.impl.PersistenceBundleManager$ProviderServiceComparator.compare(PersistenceBundleManager.java:572)	at java.util.Collections.max(Collections.java:681)	at org.apache.aries.jpa.container.impl.PersistenceBundleManager.getBestProvider(PersistenceBundleManager.java:554)	at org.apache.aries.jpa.container.impl.PersistenceBundleManager.getProviderServiceReference(PersistenceBundleManager.java:460)	at org.apache.aries.jpa.container.impl.PersistenceBundleManager.setupManager(PersistenceBundleManager.java:360)	at org.apache.aries.jpa.container.impl.PersistenceBundleManager.addingBundle(PersistenceBundleManager.java:148)	at org.osgi.util.tracker.BundleTracker$Tracked.customizerAdding(BundleTracker.java:440)	at org.osgi.util.tracker.AbstractTracked.trackAdding(AbstractTracked.java:261)	at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:233)	at org.osgi.util.tracker.BundleTracker$Tracked.bundleChanged(BundleTracker.java:413)	at org.apache.felix.framework.util.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:795)	at org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:717)	at org.apache.felix.framework.util.EventDispatcher.fireBundleEvent(EventDispatcher.java:597)	at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:3770)	at org.apache.felix.framework.Felix.installBundle(Felix.java:2656)	at org.apache.felix.framework.Felix.installBundle(Felix.java:2452)	at org.apache.felix.framework.BundleContextImpl.installBundle(BundleContextImpl.java:129)	at org.apache.karaf.shell.osgi.InstallBundle.install(InstallBundle.java:67)	at org.apache.karaf.shell.osgi.InstallBundle.doExecute(InstallBundle.java:43)	at org.apache.karaf.shell.console.OsgiCommandSupport.execute(OsgiCommandSupport.java:38)	at org.apache.felix.gogo.commands.basic.AbstractCommand.execute(AbstractCommand.java:35)	at org.apache.felix.gogo.runtime.CommandProxy.execute(CommandProxy.java:78)	at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:474)	at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:400)	at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)	at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:183)	at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:120)	at org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:89)	at org.apache.karaf.shell.console.jline.Console.run(Console.java:240)	at java.lang.Thread.run(Thread.java:662)