Symptom: Moab Web Services fails to start after upgrade, displaying "HTTP Status 404 - The requested resource () is not available" on the home page (e.g., http://mws-server:8080/mws).
mws.log has the following message:
Caused by: groovy.lang.MissingPropertyException: No such property: STANDBY for class: com.adaptc.mws.plugins.NodeReportPower
Affected Versions: 8.1.0
Action: Remove the contents of /opt/mws/plugins (after backing up the directory).
1. Back up the contents of the directory.
2. Stop tomcat.
3. Remove plugins (just empty the directory).
4. Restart tomcat.
The .war file contains the 8.1 plugins, so unless you wrote your own, you wouldn't need to do anything else.