[NIFI-11189] Restarting NiFi after failing to upgrade flow can cause NiFi to fail startup

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 2.0.0-M1, 1.21.0
• Component/s: Core Framework
• Assignee: Mark Payne
• Reporter: Mark Payne
• Created: 15/Feb/23 22:47
• Updated: 27/Mar/23 15:53
• Resolved: 22/Feb/23 08:04

Description

When a user updates a group that is under Version Control from one version to another, sometimes the destination of a connection now needs to point to a new component. And the current destination gets deleted, while the new component hasn't yet been created. To handle this, we create a temporary funnel and set the connection’s destination to that funnel.
 
Once all components are created, we then move the connections to their intended destination. Then delete the temporary funnel.
 
We have an issue, however. If, for some reason, we fail to complete the flow upgrade, that funnel may remain. We are not handling this case where this temporary funnel already exists in the flow definition very well on restart.

This can result in an error such as:

2023-02-15 16:40:03,347 WARN [main] org.eclipse.jetty.webapp.WebAppContext Failed startup of context o.e.j.w.WebAppContext@345af277{nifi-api,/nifi-api,file:///opt/nifi-1.18.0.2.1.5.1001-1/work/jetty/nifi-web-api-1.18.0.2.1.5.1001-1.war/webapp/,UNAVAILABLE}{./work/nar/extensions/nifi-server-nar-1.18.0.2.1.5.1001-1.nar-unpacked/NAR-INF/bundled-dependencies/nifi-web-api-1.18.0.2.1.5.1001-1.war}
org.apache.nifi.controller.serialization.FlowSynchronizationException: java.lang.IllegalArgumentException: Connection has a destination with identifier c594bee4-b49e-34a3-8795-732d890df61f but no component could be found in the Process Group with a corresponding identifier
        at org.apache.nifi.controller.serialization.VersionedFlowSynchronizer.synchronizeFlow(VersionedFlowSynchronizer.java:454)
        at org.apache.nifi.controller.serialization.VersionedFlowSynchronizer.sync(VersionedFlowSynchronizer.java:205)
        at org.apache.nifi.controller.serialization.StandardFlowSynchronizer.sync(StandardFlowSynchronizer.java:42)
        at org.apache.nifi.controller.FlowController.synchronize(FlowController.java:1525)
        at org.apache.nifi.persistence.StandardFlowConfigurationDAO.load(StandardFlowConfigurationDAO.java:104)
        at org.apache.nifi.controller.StandardFlowService.loadFromBytes(StandardFlowService.java:837)
        at org.apache.nifi.controller.StandardFlowService.load(StandardFlowService.java:558)
        at org.apache.nifi.web.contextlistener.ApplicationStartupContextListener.contextInitialized(ApplicationStartupContextListener.java:67)
        at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:1073)
        at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:572)
        at org.eclipse.jetty.server.handler.ContextHandler.contextInitialized(ContextHandler.java:1002)
        at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:765)
        at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:379)
        at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1449)
        at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1414)
        at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:916)
        at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:288)
        at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:524)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
        at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
        at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
        at org.eclipse.jetty.server.handler.gzip.GzipHandler.doStart(GzipHandler.java:426)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
        at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
        at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
        at org.eclipse.jetty.server.Server.start(Server.java:423)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
        at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
        at org.eclipse.jetty.server.Server.doStart(Server.java:387)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
        at org.apache.nifi.web.server.JettyServer.start(JettyServer.java:814)
        at org.apache.nifi.NiFi.<init>(NiFi.java:172)
        at org.apache.nifi.NiFi.<init>(NiFi.java:83)
        at org.apache.nifi.NiFi.main(NiFi.java:332)
Caused by: java.lang.IllegalArgumentException: Connection has a destination with identifier c594bee4-b49e-34a3-8795-732d890df61f but no component could be found in the Process Group with a corresponding identifier
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.addConnection(StandardVersionedComponentSynchronizer.java:3273)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronizeConnections(StandardVersionedComponentSynchronizer.java:650)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronize(StandardVersionedComponentSynchronizer.java:455)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.addProcessGroup(StandardVersionedComponentSynchronizer.java:1137)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronizeChildGroups(StandardVersionedComponentSynchronizer.java:521)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronize(StandardVersionedComponentSynchronizer.java:410)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.addProcessGroup(StandardVersionedComponentSynchronizer.java:1137)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronizeChildGroups(StandardVersionedComponentSynchronizer.java:521)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronize(StandardVersionedComponentSynchronizer.java:410)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.addProcessGroup(StandardVersionedComponentSynchronizer.java:1137)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronizeChildGroups(StandardVersionedComponentSynchronizer.java:521)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronize(StandardVersionedComponentSynchronizer.java:410)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.addProcessGroup(StandardVersionedComponentSynchronizer.java:1137)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronizeChildGroups(StandardVersionedComponentSynchronizer.java:521)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronize(StandardVersionedComponentSynchronizer.java:410)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.addProcessGroup(StandardVersionedComponentSynchronizer.java:1137)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronizeChildGroups(StandardVersionedComponentSynchronizer.java:521)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronize(StandardVersionedComponentSynchronizer.java:410)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.addProcessGroup(StandardVersionedComponentSynchronizer.java:1137)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronizeChildGroups(StandardVersionedComponentSynchronizer.java:521)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronize(StandardVersionedComponentSynchronizer.java:410)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.lambda$synchronize$0(StandardVersionedComponentSynchronizer.java:254)
        at org.apache.nifi.controller.flow.AbstractFlowManager.withParameterContextResolution(AbstractFlowManager.java:550)
        at org.apache.nifi.flow.synchronization.StandardVersionedComponentSynchronizer.synchronize(StandardVersionedComponentSynchronizer.java:252)
        at org.apache.nifi.groups.StandardProcessGroup.synchronizeFlow(StandardProcessGroup.java:3970)
        at org.apache.nifi.controller.serialization.VersionedFlowSynchronizer.synchronizeFlow(VersionedFlowSynchronizer.java:445)
        ... 45 common frames omitted 

Or, alternatively, depending on the version of NiFi, it may provide an error such as:

2023-02-15 15:53:04,617 WARN [main] org.eclipse.jetty.webapp.WebAppContext Failed startup of context o.e.j.w.WebAppContext@3fe8ad3f{nifi-api,/nifi-api,file:///Users/mpayne/devel/nifi/nifi-assembly/target/nifi-2.0.0-SNAPSHOT-bin/nifi-2.0.0-SNAPSHOT/work/jetty/nifi-web-api-2.0.0-SNAPSHOT.war/webapp/,UNAVAILABLE}{./work/nar/extensions/nifi-server-nar-2.0.0-SNAPSHOT.nar-unpacked/NAR-INF/bundled-dependencies/nifi-web-api-2.0.0-SNAPSHOT.war}
java.lang.IllegalArgumentException: Unable to map Connectable Component with identifier 79604f5f-3569-3c47-9af3-f780d6fac648-temp-funnel to any version-controlled component
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.lambda$mapConnectable$7(NiFiRegistryFlowMapper.java:427)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.getIdOrThrow(NiFiRegistryFlowMapper.java:379)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.mapConnectable(NiFiRegistryFlowMapper.java:426)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.mapConnection(NiFiRegistryFlowMapper.java:418)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
        at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.mapGroup(NiFiRegistryFlowMapper.java:311)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.lambda$mapGroup$4(NiFiRegistryFlowMapper.java:306)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
        at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.mapGroup(NiFiRegistryFlowMapper.java:307)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.lambda$mapGroup$4(NiFiRegistryFlowMapper.java:306)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
        at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.mapGroup(NiFiRegistryFlowMapper.java:307)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.lambda$mapGroup$4(NiFiRegistryFlowMapper.java:306)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
        at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.mapGroup(NiFiRegistryFlowMapper.java:307)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.lambda$mapGroup$4(NiFiRegistryFlowMapper.java:306)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
        at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.mapGroup(NiFiRegistryFlowMapper.java:307)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.lambda$mapGroup$4(NiFiRegistryFlowMapper.java:306)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
        at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.mapGroup(NiFiRegistryFlowMapper.java:307)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.lambda$mapGroup$4(NiFiRegistryFlowMapper.java:306)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
        at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1621)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.mapGroup(NiFiRegistryFlowMapper.java:307)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.mapGroup(NiFiRegistryFlowMapper.java:235)
        at org.apache.nifi.registry.flow.mapping.NiFiRegistryFlowMapper.mapProcessGroup(NiFiRegistryFlowMapper.java:158)
        at org.apache.nifi.controller.serialization.VersionedDataflowMapper.mapRootGroup(VersionedDataflowMapper.java:155)
        at org.apache.nifi.controller.serialization.VersionedDataflowMapper.createMapping(VersionedDataflowMapper.java:91)
        at org.apache.nifi.controller.serialization.VersionedFlowSerializer.transform(VersionedFlowSerializer.java:53)
        at org.apache.nifi.controller.serialization.VersionedFlowSerializer.transform(VersionedFlowSerializer.java:34)
        at org.apache.nifi.controller.FlowController.serialize(FlowController.java:1536)
        at org.apache.nifi.persistence.StandardFlowConfigurationDAO.serializeControllerStateToTempFile(StandardFlowConfigurationDAO.java:235)
        at org.apache.nifi.persistence.StandardFlowConfigurationDAO.saveFlow(StandardFlowConfigurationDAO.java:210)
        at org.apache.nifi.persistence.StandardFlowConfigurationDAO.saveJson(StandardFlowConfigurationDAO.java:197)
        at org.apache.nifi.persistence.StandardFlowConfigurationDAO.save(StandardFlowConfigurationDAO.java:188)
        at org.apache.nifi.controller.StandardFlowService.load(StandardFlowService.java:540)
        at org.apache.nifi.web.contextlistener.ApplicationStartupContextListener.contextInitialized(ApplicationStartupContextListener.java:67)
        at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:1073)
        at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:572)
        at org.eclipse.jetty.server.handler.ContextHandler.contextInitialized(ContextHandler.java:1002)
        at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:765)
        at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:379)
        at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1449)
        at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1414)
        at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:916)
        at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:288)
        at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:524)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
        at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
        at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
        at org.eclipse.jetty.server.handler.gzip.GzipHandler.doStart(GzipHandler.java:426)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
        at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
        at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
        at org.eclipse.jetty.server.Server.start(Server.java:423)
        at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
        at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
        at org.eclipse.jetty.server.Server.doStart(Server.java:387)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
        at org.apache.nifi.web.server.JettyServer.start(JettyServer.java:815)
        at org.apache.nifi.NiFi.<init>(NiFi.java:172)
        at org.apache.nifi.NiFi.<init>(NiFi.java:83)
        at org.apache.nifi.NiFi.main(NiFi.java:332) 

Issue Links

• links to: GitHub Pull Request #6963