I experimented with a new build of 1.12 and copied over flow.xml.gz
from an older NiFi (1.8 and 1.11) and now get this. Did something
change? Because I have a version of 1.12 that I built a few weeks ago
where I'm not getting this with the same flow.xml.gz

org.apache.nifi.controller.serialization.FlowSynchronizationException:
java.lang.IllegalStateException: The specified class
'org.apache.nifi.prioritizer.FirstInFirstOutPrioritizer' is not known
to this nifi.
    at 
org.apache.nifi.controller.StandardFlowSynchronizer.sync(StandardFlowSynchronizer.java:306)
    at 
org.apache.nifi.controller.FlowController.synchronize(FlowController.java:1425)
    at 
org.apache.nifi.persistence.StandardXMLFlowConfigurationDAO.load(StandardXMLFlowConfigurationDAO.java:89)
    at 
org.apache.nifi.controller.StandardFlowService.loadFromBytes(StandardFlowService.java:792)
    at 
org.apache.nifi.controller.StandardFlowService.load(StandardFlowService.java:537)
    at 
org.apache.nifi.web.contextlistener.ApplicationStartupContextListener.contextInitialized(ApplicationStartupContextListener.java:72)
    at 
org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:930)
    at 
org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:553)
    at 
org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:889)
    at 
org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:356)
    at 
org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1445)
    at 
org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1409)
    at 
org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:822)
    at 
org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:275)
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:524)
    at 
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
    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:72)
    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:425)
    at 
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
    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:72)
    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:72)
    at 
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
    at org.eclipse.jetty.server.Server.start(Server.java:407)
    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:371)
    at 
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72)
    at org.apache.nifi.web.server.JettyServer.start(JettyServer.java:1060)
    at org.apache.nifi.NiFi.<init>(NiFi.java:160)
    at org.apache.nifi.NiFi.<init>(NiFi.java:72)
    at org.apache.nifi.NiFi.main(NiFi.java:303)
Caused by: java.lang.IllegalStateException: The specified class
'org.apache.nifi.prioritizer.FirstInFirstOutPrioritizer' is not known
to this nifi.
    at 
org.apache.nifi.controller.flow.StandardFlowManager.createPrioritizer(StandardFlowManager.java:309)
    at 
org.apache.nifi.controller.StandardFlowSynchronizer.addConnections(StandardFlowSynchronizer.java:1667)
    at 
org.apache.nifi.controller.StandardFlowSynchronizer.addProcessGroup(StandardFlowSynchronizer.java:1324)
    at 
org.apache.nifi.controller.StandardFlowSynchronizer.addNestedProcessGroups(StandardFlowSynchronizer.java:1333)
    at 
org.apache.nifi.controller.StandardFlowSynchronizer.addProcessGroup(StandardFlowSynchronizer.java:1322)
    at 
org.apache.nifi.controller.StandardFlowSynchronizer.addNestedProcessGroups(StandardFlowSynchronizer.java:1333)
    at 
org.apache.nifi.controller.StandardFlowSynchronizer.addProcessGroup(StandardFlowSynchronizer.java:1322)
    at 
org.apache.nifi.controller.StandardFlowSynchronizer.updateFlow(StandardFlowSynchronizer.java:432)
    at 
org.apache.nifi.controller.StandardFlowSynchronizer.sync(StandardFlowSynchronizer.java:283)
    ... 42 common frames omitted

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