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When the current user activity record the admin console is blank and the following error is seen in the application server log:
YYYY-MM-DD HH:MM:SS.MMM INFO [ajp-nio-8009-exec-2] org.apache.catalina.core.StandardWrapperValve.invoke YYYY-MM-DD HH:MM:SS,MMM [ajp-nio-8009-exec-2] WARN com.appiancorp.security.auth.activity.UserActivityFilter - Could not record user activity: secCtx=BPMSVC7, authDetails=AuthenticationDetails[ts=YYYY-MM-DD HH:MM:SS.MMM, entryPoint=PORTAL, clientIpAddress=XX.XX.XXX.XX, clientUserAgent=Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.92 Safari/537.36] -- java.lang.NullPointerException
This is due to the fact the user is using an Apache version earlier than 2.4 and the mod_jk connector earlier than 1.2.42.
SetEnvIf Server_Addr "(.*)" AJP_LOCAL_ADDR=$1
JkEnvVar AJP_LOCAL_ADDR
Then restart Apache.