If you're using SeleniumMonitor with PhantomJSDriver and your services are failing, with the following appearing in poller.log:
Then you probably need to add the following JAR to /opt/opennms/lib and restart:
It appears the PhantomJSDriver POM does not declare this dependency. We should probably add it to the protocols/selenium POM?
This issue references support ticket https://mynms.opennms.com/Ticket/Display.html?id=3887