DRAFT KB-XXXX Current user activity is blank even after clearing the search indices

Symptom

The Current User Activity tab in the Admin Console is blank. The following WARN message appears 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

Cause

This issue occurs when the environment is using a version of Apache that is earlier than Apache 2.4, and the mod_jk connector version is earlier than 1.2.42.

Action

Upgrade to the most recent version of Apache and the mod_jk connector.

Workaround

1. Add the following lines to the bottom of the Apache httpd.conf file:

   SetEnvIf Server_Addr "(.*)" AJP_LOCAL_ADDR=$1

   JkEnvVar AJP_LOCAL_ADDR

2. Restart Apache. 

Affected Versions

This article applies to all versions of Appian using Apache as a web server