Oozie server fails to start with class not found

[#1]

SYMPTOM FATAL Services - SERVER[deadpool.lab.local] E0113: class not found [org.apache.oozie.extensions.OozieELExtensions]org.apache.oozie.service.ServiceException: E0113: class not found [org.apache.oozie.extensions.OozieELExtensions]at org.apache.oozie.service.ELService.findMethod(ELService.java:226)at org.apache.oozie.service.ELService.extractFunctions(ELService.java:104)at org.apache.oozie.service.ELService.init(ELService.java:135)at org.apache.oozie.service.Services.setServiceInternal(Services.java:386)at org.apache.oozie.service.Services.setService(Services.java:372)at org.apache.oozie.service.Services.loadServices(Services.java:305)at org.apache.oozie.service.Services.init(Services.java:213)at org.apache.oozie.servlet.ServicesLoader.contextInitialized(ServicesLoader.java:46)at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4210)at org.apache.catalina.core.StandardContext.start(StandardContext.java:4709)at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:802)at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:583)at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:676)at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:602)at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:503)at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1322)at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:325)at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1068)at org.apache.catalina.core.StandardHost.start(StandardHost.java:822)at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1060)at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)at org.apache.catalina.core.StandardService.start(StandardService.java:525)at org.apache.catalina.core.StandardServer.start(StandardServer.java:759)at org.apache.catalina.startup.Catalina.start(Catalina.java:595)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:497)at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

ROOT CAUSE :

This happens when Falcon is uninstalled from the cluster.

WORKAROUND :

Remove properties mentioned in below document from oozie-site.xml and restart Oozie server via Ambari

https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.6.1/bk_command-line-installation/content/config...