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java.lang.NullPointerException: 	at org.apache.ambari.server.actionmanager.ActionDBAccessorImpl.persistActions(ActionDBAccessorImpl.java:300)	at org.apache.ambari.server.orm.AmbariJpaLocalTxnInterceptor.invoke(AmbariJpaLocalTxnInterceptor.java:68)	at org.apache.ambari.server.actionmanager.ActionManager.sendActions(ActionManager.java:99)	at org.apache.ambari.server.controller.internal.RequestStageContainer.persist(RequestStageContainer.java:216)	at org.apache.ambari.server.controller.AmbariManagementControllerImpl.updateCluster(AmbariManagementControllerImpl.java:1567)	at org.apache.ambari.server.controller.AmbariManagementControllerImpl.updateClusters(AmbariManagementControllerImpl.java:1308)	at org.apache.ambari.server.controller.internal.ClusterResourceProvider$2.invoke(ClusterResourceProvider.java:241)	at org.apache.ambari.server.controller.internal.ClusterResourceProvider$2.invoke(ClusterResourceProvider.java:238)	at org.apache.ambari.server.controller.internal.AbstractResourceProvider.modifyResources(AbstractResourceProvider.java:330)	at org.apache.ambari.server.controller.internal.ClusterResourceProvider.updateResources(ClusterResourceProvider.java:238)	at org.apache.ambari.server.controller.internal.ClusterControllerImpl.updateResources(ClusterControllerImpl.java:310)	at org.apache.ambari.server.api.services.persistence.PersistenceManagerImpl.update(PersistenceManagerImpl.java:104)	at org.apache.ambari.server.api.handlers.UpdateHandler.persist(UpdateHandler.java:42)	at org.apache.ambari.server.api.handlers.BaseManagementHandler.handleRequest(BaseManagementHandler.java:72)	at org.apache.ambari.server.api.services.BaseRequest.process(BaseRequest.java:135)	at org.apache.ambari.server.api.services.BaseService.handleRequest(BaseService.java:105)	at org.apache.ambari.server.api.services.BaseService.handleRequest(BaseService.java:74)	at org.apache.ambari.server.api.services.ClusterService.updateCluster(ClusterService.java:151)	at sun.reflect.GeneratedMethodAccessor192.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)	at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)	at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)	at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)	at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)	at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)	at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)	at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542)	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473)	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)	at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:540)	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:715)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1496)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.apache.ambari.server.security.authorization.AmbariAuthorizationFilter.doFilter(AmbariAuthorizationFilter.java:182)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)	at org.apache.ambari.server.api.MethodOverrideFilter.doFilter(MethodOverrideFilter.java:72)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)	at org.apache.ambari.server.api.AmbariPersistFilter.doFilter(AmbariPersistFilter.java:47)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)	at org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:82)	at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:294)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)	at org.apache.ambari.server.controller.AmbariHandlerList.processHandlers(AmbariHandlerList.java:209)	at org.apache.ambari.server.controller.AmbariHandlerList.processHandlers(AmbariHandlerList.java:198)	at org.apache.ambari.server.controller.AmbariHandlerList.handle(AmbariHandlerList.java:132)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)	at org.eclipse.jetty.server.Server.handle(Server.java:370)	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)	at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982)	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)	at java.lang.Thread.run(Thread.java:745)