java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at org.sonar.core.platform.PluginLoader.basePluginKey(PluginLoader.java:176)
at org.sonar.core.platform.PluginLoader.defineClassloaders(PluginLoader.java:85)
at org.sonar.core.platform.PluginLoader.load(PluginLoader.java:71)
at org.sonar.ce.container.CePluginRepository.start(CePluginRepository.java:71)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.invokeMethod(ReflectionLifecycleStrategy.java:110)
at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.start(ReflectionLifecycleStrategy.java:89)
at org.sonar.core.platform.ComponentContainer$1.start(ComponentContainer.java:320)
at org.picocontainer.injectors.AbstractInjectionFactory$LifecycleAdapter.start(AbstractInjectionFactory.java:84)
at org.picocontainer.behaviors.AbstractBehavior.start(AbstractBehavior.java:169)
at org.picocontainer.behaviors.Stored$RealComponentLifecycle.start(Stored.java:132)
at org.picocontainer.behaviors.Stored.start(Stored.java:110)
at org.picocontainer.DefaultPicoContainer.potentiallyStartAdapter(DefaultPicoContainer.java:1016)
at org.picocontainer.DefaultPicoContainer.startAdapters(DefaultPicoContainer.java:1009)
at org.picocontainer.DefaultPicoContainer.start(DefaultPicoContainer.java:767)
at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:141)
at org.sonar.ce.container.ComputeEngineContainerImpl.start(ComputeEngineContainerImpl.java:605)
at org.sonar.ce.ComputeEngineImpl.startup(ComputeEngineImpl.java:43)
at org.sonar.ce.app.CeServer$CeMainThread.startup(CeServer.java:175)
at org.sonar.ce.app.CeServer$CeMainThread.attemptStartup(CeServer.java:165)
at org.sonar.ce.app.CeServer$CeMainThread.run(CeServer.java:153)

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