while starting oozie service getting below error: oozie server status:Execution of 'source /usr/hdp/current/oozie-server/conf/oozie-env.sh ; oozie admin -oozie http://master1:11000/oozie -status' returned 255. Connection exception has occurred [ java.net.ConnectException Connection refused (Connection refused) ]. Trying after 1 sec. Retry count = 1 Connection exception has occurred [ java.net.ConnectException Connection refused (Connection refused) ]. oozie server web ui:Connection failed to master1:11000/oozie/?user.name=oozie (<urlopen error [Errno 111] Connection refused>) oozie log: Jun 03, 2019 8:34:40 PM org.apache.coyote.http11.Http11Protocol pause INFO: Pausing Coyote HTTP/1.1 on http-11000 Jun 03, 2019 8:34:41 PM org.apache.catalina.core.StandardService stop INFO: Stopping service Catalina Jun 03, 2019 8:34:41 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc SEVERE: The web application [/oozie] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. Jun 03, 2019 8:34:41 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads SEVERE: The web application [/oozie] appears to have started a thread named [FileWatchdog] but has failed to stop it. This is very likely to create a memory leak. ... View more