Hi Koji, Thank you for your response. Indeed, you are right. I have sorted it out already :) I had a custom Abstract processor class which I was extending, and misused init method.
Thanks again! On 5/21/17, 9:38 PM, "Koji Kawamura" <ijokaruma...@gmail.com> wrote: >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(DtoFacto >>ry.java:1726) >> >> at >>org.apache.nifi.web.StandardNiFiServiceFacade.getProcessGroupFlow(Standar >>dNiFiServiceFacade.java:3055) >> >> at >>org.apache.nifi.web.StandardNiFiServiceFacade$$FastClassBySpringCGLIB$$35 >>8780e0.invoke(<generated>) >> >> at >>org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) >> >> at >>org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.inv >>okeJoinpoint(CglibAopProxy.java:720) >> >> at >>org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refl >>ectiveMethodInvocation.java:157) >> >> at >>org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proce >>ed(MethodInvocationProceedingJoinPoint.java:85) >> >> at >>org.apache.nifi.web.NiFiServiceFacadeLock.proceedWithReadLock(NiFiService >>FacadeLock.java:137) >> >> at >>org.apache.nifi.web.NiFiServiceFacadeLock.getLock(NiFiServiceFacadeLock.j >>ava:108) >> >> at sun.reflect.GeneratedMethodAccessor79.invoke(Unknown Source) >> >> at >>sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorI >>mpl.java:43) >> >> at java.lang.reflect.Method.invoke(Method.java:498) >> >> at >>org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodW >>ithGivenArgs(AbstractAspectJAdvice.java:621) >> >> at >>org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod( >>AbstractAspectJAdvice.java:610) >> >> at >>org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundA >>dvice.java:68) >> >> at >>org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refl >>ectiveMethodInvocation.java:179) >> >> at >>org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(Ex >>poseInvocationInterceptor.java:92) >> >> at >>org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Refl >>ectiveMethodInvocation.java:179) >> >> at >>org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor >>.intercept(CglibAopProxy.java:655) >> >> at >>org.apache.nifi.web.StandardNiFiServiceFacade$$EnhancerBySpringCGLIB$$c6b >>bb5bc.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(DelegatingMethodAccessorI >>mpl.java:43) >> >> at java.lang.reflect.Method.invoke(Method.java:498) >> >> at >>com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethod >>InvokerFactory.java:60) >> >> at >>com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDi >>spatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatc >>hProvider.java:205) >> >> at >>com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispat >>cher.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(RightHandPa >>thRule.java:147) >> >> at >>com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceCla >>ssRule.java:108) >> >> at >>com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPa >>thRule.java:147) >> >> at >>com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootR >>esourceClassesRule.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(W >>ebApplicationImpl.java:1419) >> >> at >>com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(W >>ebApplicationImpl.java:1409) >> >> at >>com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.ja >>va:409) >> >> at >>com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletCont >>ainer.java:558) >> >> at >>com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletCont >>ainer.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$CachedChain.doFilter(ServletHand >>ler.java:1634) >> >> at >>org.apache.nifi.web.filter.RequestLogger.doFilter(RequestLogger.java:66) >> >> at >>org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHand >>ler.java:1621) >> >> at >>org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFi >>lter(FilterChainProxy.java:316) >> >> at >>org.springframework.security.web.access.intercept.FilterSecurityIntercept >>or.invoke(FilterSecurityInterceptor.java:126) >> >> at >>org.springframework.security.web.access.intercept.FilterSecurityIntercept >>or.doFilter(FilterSecurityInterceptor.java:90) >> >> at >>org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFi >>lter(FilterChainProxy.java:330) >> >> at >>org.springframework.security.web.session.SessionManagementFilter.doFilter >>(SessionManagementFilter.java:122) >> >> at >>org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFi >>lter(FilterChainProxy.java:330) >> >> at >>org.springframework.security.web.authentication.AnonymousAuthenticationFi >>lter.doFilter(AnonymousAuthenticationFilter.java:111) >> >> at >>org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFi >>lter(FilterChainProxy.java:330) >> >> at >>org.apache.nifi.web.security.NiFiAuthenticationFilter.authenticate(NiFiAu >>thenticationFilter.java:83) >> >> at >>org.apache.nifi.web.security.NiFiAuthenticationFilter.doFilter(NiFiAuthen >>ticationFilter.java:57) >> >> at >>org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFi >>lter(FilterChainProxy.java:330) >> >> at >>org.apache.nifi.web.security.NiFiAuthenticationFilter.authenticate(NiFiAu >>thenticationFilter.java:83) >> >> at >>org.apache.nifi.web.security.NiFiAuthenticationFilter.doFilter(NiFiAuthen >>ticationFilter.java:57) >> >> at >>org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFi >>lter(FilterChainProxy.java:330) >> >> at >>org.apache.nifi.web.security.NiFiAuthenticationFilter.authenticate(NiFiAu >>thenticationFilter.java:83) >> >> at >>org.apache.nifi.web.security.NiFiAuthenticationFilter.doFilter(NiFiAuthen >>ticationFilter.java:57) >> >> at >>org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFi >>lter(FilterChainProxy.java:330) >> >> at >>org.springframework.security.web.FilterChainProxy.doFilterInternal(Filter >>ChainProxy.java:213) >> >> at >>org.springframework.security.web.FilterChainProxy.doFilter(FilterChainPro >>xy.java:176) >> >> at >>org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(Deleg >>atingFilterProxy.java:346) >> >> at >>org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingF >>ilterProxy.java:262) >> >> at >>org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHand >>ler.java:1621) >> >> at org.apache.nifi.web.filter.TimerFilter.doFilter(TimerFilter.java:51) >> >> at >>org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHand >>ler.java:1613) >> >> at >>org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:541 >>) >> >> at >>org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java: >>143) >> >> at >>org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:54 >>8) >> >> at >>org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.jav >>a:132) >> >> at >>org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.j >>ava:190) >> >> at >>org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.j >>ava:1593) >> >> at >>org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.j >>ava:188) >> >> at >>org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.j >>ava:1239) >> >> at >>org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.ja >>va:168) >> >> at >>org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:481) >> >> at >>org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.ja >>va:1562) >> >> at >>org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.ja >>va:166) >> >> at >>org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.ja >>va:1141) >> >> at >>org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java: >>141) >> >> at >>org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollecti >>on.java:118) >> >> at >>org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java >>:561) >> >> at >>org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.jav >>a:132) >> >> at org.eclipse.jetty.server.Server.handle(Server.java:564) >> >> at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320) >> >> at >>org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:25 >>1) >> >> at >>org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractCo >>nnection.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.ja >>va:672) >> >> at >>org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.jav >>a:590) >> >> at java.lang.Thread.run(Thread.java:745) >> >> ________________________________ >> >> LEGAL DISCLAIMER: M.C. 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