[ 
https://issues.apache.org/jira/browse/KYLIN-5294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17634695#comment-17634695
 ] 

mukvin commented on KYLIN-5294:
-------------------------------

Hi [~Rohannimmagadda] ,

Can you descript the re-produce steps in detail?

The user deleting previous entries from UI is normal behavior and the metadata 
will update.

The NPE exception looks weird.

> Getting NPE while opening Monitor tab in Kylin UI
> -------------------------------------------------
>
>                 Key: KYLIN-5294
>                 URL: https://issues.apache.org/jira/browse/KYLIN-5294
>             Project: Kylin
>          Issue Type: Bug
>          Components: Metrics, Query Engine, Web 
>    Affects Versions: v4.0.2
>            Reporter: Rohan Nimmagadda
>            Priority: Major
>         Attachments: image-2022-11-15-10-00-22-892.png
>
>
> Getting NPE while opening Monitor tab in Kylin UI 
> {code:java}
> 2022-11-14 14:31:43,164 ERROR [http-nio-7070-exec-4] 
> controller.BasicController:65 :
> org.apache.kylin.rest.exception.InternalErrorException: 
> java.lang.NullPointerException
>     at 
> org.apache.kylin.rest.controller.JobController.list(JobController.java:108)
>     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.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
>     at 
> org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
>     at 
> org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
>     at 
> org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)
>     at 
> org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)
>     at 
> org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
>     at 
> org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1043)
>     at 
> org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
>     at 
> org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
>     at 
> org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
>     at javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
>     at 
> org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
>     at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
>     at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
>     at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
>     at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
>     at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
>     at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:327)
>     at 
> org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:115)
>     at 
> org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:81)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
>     at 
> org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:121)
>     at 
> org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:115)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
>     at 
> org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:126)
>     at 
> org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:81)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
>     at 
> org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:105)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
>     at 
> org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:149)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
>     at 
> org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
>     at 
> org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:149)
>     at 
> org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
>     at 
> org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:218)
>     at 
> org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:212)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
>     at 
> org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103)
>     at 
> org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
>     at 
> org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
>     at 
> org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
>     at 
> org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
>     at 
> org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55)
>     at 
> org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
>     at 
> org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110)
>     at 
> org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80)
>     at 
> org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
>     at 
> org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:211)
>     at 
> org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183)
>     at 
> org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
>     at 
> org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
>     at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
>     at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
>     at com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:209)
>     at com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:244)
>     at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
>     at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
>     at 
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
>     at 
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
>     at 
> org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)
>     at 
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
>     at 
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
>     at 
> org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)
>     at 
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
>     at 
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:367)
>     at 
> org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:639)
>     at 
> org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
>     at 
> org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:882)
>     at 
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1647)
>     at 
> org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
>     at 
> org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
>     at 
> org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
>     at 
> org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
>     at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.NullPointerException
>     at 
> org.apache.kylin.rest.service.JobService.getSingleJobInstance(JobService.java:553)
>     at 
> org.apache.kylin.rest.service.JobService.getJobInstance(JobService.java:501)
>     at 
> org.apache.kylin.rest.service.JobService.searchJobsV2(JobService.java:981)
>     at 
> org.apache.kylin.rest.controller.JobController.list(JobController.java:104)
>     ... 84 more {code}
> !image-2022-11-15-10-00-22-892.png!



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