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https://issues.apache.org/jira/browse/NIFI-10937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Nathan Gough resolved NIFI-10937.
---------------------------------
    Fix Version/s: 1.20.0
                   1.19.1
       Resolution: Fixed

> If Registry Client exists in flow, NiFi will fail to startup from flow.xml.gz
> -----------------------------------------------------------------------------
>
>                 Key: NIFI-10937
>                 URL: https://issues.apache.org/jira/browse/NIFI-10937
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>            Reporter: Mark Payne
>            Assignee: Mark Payne
>            Priority: Critical
>             Fix For: 1.20.0, 1.19.1
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> If there exists a flow and a Registry Client has been added, upon restart 
> everything loads properly from the flow.json.gz. But if for any reason we 
> attempt to load from flow.xml.gz (because flow.json.gz was removed), NiFi 
> will fail to startup with a NullPointerException:
> {code:java}
> 2022-12-02 16:15:35,462 WARN [main] org.apache.nifi.web.server.JettyServer 
> Failed to start web server... shutting down.
> java.lang.NullPointerException: null
>         at 
> java.util.Comparator.lambda$comparing$77a9974f$1(Comparator.java:469)
>         at java.util.TimSort.countRunAndMakeAscending(TimSort.java:355)
>         at java.util.TimSort.sort(TimSort.java:220)
>         at java.util.Arrays.sort(Arrays.java:1512)
>         at java.util.ArrayList.sort(ArrayList.java:1464)
>         at 
> org.apache.nifi.fingerprint.FingerprintFactory.addFlowControllerFingerprint(FingerprintFactory.java:200)
>         at 
> org.apache.nifi.fingerprint.FingerprintFactory.createFingerprint(FingerprintFactory.java:155)
>         at 
> org.apache.nifi.fingerprint.FingerprintFactory.createFingerprint(FingerprintFactory.java:129)
>         at 
> org.apache.nifi.controller.inheritance.FlowFingerprintCheck.checkInheritability(FlowFingerprintCheck.java:45)
>         at 
> org.apache.nifi.controller.XmlFlowSynchronizer.sync(XmlFlowSynchronizer.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:817)
>         at 
> org.apache.nifi.controller.StandardFlowService.load(StandardFlowService.java:538)
>         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) {code}



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