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From Koji Kawamura <ijokaruma...@gmail.com>
Subject Re: Custom processor UI exception
Date Mon, 22 May 2017 01:38:26 GMT
Hello Yuri,

>From the stack trace (line numbers) I assume you are using NiFi 1.2.0.
If so, I think NullPointer can be thrown if your custom processor
returns null from its getRelationships() method. A list of possible
relationships from a processor should be returned, if the processor
doesn't have outgoing relationship, then return
Collections.emptySet().

Otherwise, please let us know which version you are using.

Thanks,
Koji

On Sat, May 20, 2017 at 12:41 AM, Yuri Krysko <Yuri.Krysko@mcdean.com> wrote:
> Hello Devs,
>
> I am working on a custom processor for NiFi and I am getting the below exception in the
nifi-user.log when I try to add the processor to the flow canvas. Could you please advise
what could I be doing wrong. No errors in the nifi-app.log though. Thanks!
>
>
> 2017-05-19 11:31:07,983 ERROR [NiFi Web Server-22] o.a.nifi.web.api.config.ThrowableMapper
An unexpected error has occurred: java.lang.NullPointerException. Returning Internal Server
Error response.
>
> java.lang.NullPointerException: null
>
> at org.apache.nifi.web.api.dto.DtoFactory.createProcessorDto(DtoFactory.java:2226)
>
> at org.apache.nifi.web.api.dto.DtoFactory.createFlowDto(DtoFactory.java:1884)
>
> at org.apache.nifi.web.api.dto.DtoFactory.createProcessGroupFlowDto(DtoFactory.java:1726)
>
> at org.apache.nifi.web.StandardNiFiServiceFacade.getProcessGroupFlow(StandardNiFiServiceFacade.java:3055)
>
> at org.apache.nifi.web.StandardNiFiServiceFacade$$FastClassBySpringCGLIB$$358780e0.invoke(<generated>)
>
> at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
>
> at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720)
>
> at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
>
> at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:85)
>
> at org.apache.nifi.web.NiFiServiceFacadeLock.proceedWithReadLock(NiFiServiceFacadeLock.java:137)
>
> at org.apache.nifi.web.NiFiServiceFacadeLock.getLock(NiFiServiceFacadeLock.java:108)
>
> at sun.reflect.GeneratedMethodAccessor79.invoke(Unknown Source)
>
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>
> at java.lang.reflect.Method.invoke(Method.java:498)
>
> at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:621)
>
> at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:610)
>
> at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:68)
>
> at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
>
> at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
>
> at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
>
> at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655)
>
> at org.apache.nifi.web.StandardNiFiServiceFacade$$EnhancerBySpringCGLIB$$c6bbb5bc.getProcessGroupFlow(<generated>)
>
> at org.apache.nifi.web.api.FlowResource.getFlow(FlowResource.java:375)
>
> 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.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:558)
>
> at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)
>
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
>
> at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:841)
>
> at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
>
> at org.apache.nifi.web.filter.RequestLogger.doFilter(RequestLogger.java:66)
>
> at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1621)
>
> at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:316)
>
> at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)
>
> at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)
>
> at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
>
> at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:122)
>
> at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
>
> at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
>
> at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
>
> at org.apache.nifi.web.security.NiFiAuthenticationFilter.authenticate(NiFiAuthenticationFilter.java:83)
>
> at org.apache.nifi.web.security.NiFiAuthenticationFilter.doFilter(NiFiAuthenticationFilter.java:57)
>
> at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
>
> at org.apache.nifi.web.security.NiFiAuthenticationFilter.authenticate(NiFiAuthenticationFilter.java:83)
>
> at org.apache.nifi.web.security.NiFiAuthenticationFilter.doFilter(NiFiAuthenticationFilter.java:57)
>
> at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
>
> at org.apache.nifi.web.security.NiFiAuthenticationFilter.authenticate(NiFiAuthenticationFilter.java:83)
>
> at org.apache.nifi.web.security.NiFiAuthenticationFilter.doFilter(NiFiAuthenticationFilter.java:57)
>
> at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
>
> at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:213)
>
> at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:176)
>
> at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
>
> at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
>
> at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1621)
>
> at org.apache.nifi.web.filter.TimerFilter.doFilter(TimerFilter.java:51)
>
> at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1613)
>
> at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:541)
>
> at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
>
> at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
>
> at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
>
> at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
>
> at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1593)
>
> at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
>
> at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1239)
>
> at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
>
> at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:481)
>
> at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1562)
>
> at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
>
> at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1141)
>
> at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
>
> at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:118)
>
> at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:561)
>
> at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
>
> at org.eclipse.jetty.server.Server.handle(Server.java:564)
>
> at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
>
> at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
>
> at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
>
> at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
>
> at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
>
> at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672)
>
> at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590)
>
> at java.lang.Thread.run(Thread.java:745)
>
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>
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