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java.lang.NullPointerException: null	at com.vaadin.spring.internal.DefaultViewCache.destroy(DefaultViewCache.java:196)	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:498)	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:366)	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeDestroyMethods(InitDestroyAnnotationBeanPostProcessor.java:325)	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeDestruction(InitDestroyAnnotationBeanPostProcessor.java:154)	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:253)	at org.springframework.beans.factory.support.DisposableBeanAdapter.run(DisposableBeanAdapter.java:246)	at com.vaadin.spring.internal.BeanStore.destroy(BeanStore.java:101)	at com.vaadin.spring.internal.SessionLockingBeanStore.destroy(SessionLockingBeanStore.java:66)	at com.vaadin.spring.internal.UIScopeImpl$UIStore.destroy(UIScopeImpl.java:237)	at com.vaadin.spring.internal.UIScopeImpl$UIStore.serviceDestroy(UIScopeImpl.java:247)	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:498)	at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:508)	at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:198)	at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:161)	at com.vaadin.server.VaadinService.destroy(VaadinService.java:1893)	at com.vaadin.server.VaadinServlet.destroy(VaadinServlet.java:1360)	at org.apache.catalina.core.StandardWrapper.unload(StandardWrapper.java:1340)	at org.apache.catalina.core.StandardWrapper.stopInternal(StandardWrapper.java:1671)	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:226)	at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5399)	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:226)	at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1435)	at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1424)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)