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.kry...@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) > 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