I've been having some issues with NoHandlerException's in a multi server configuration. I've been trying to figure out exactly when I get this exception but I can not find any good description on what it actually means that no handler was found.

The thing here is that everything actually seems to work fine, we are not receiving any error reports on this from our production system, and we are not able to reproduce the error in our test systems. But we can clearly see a big amount of no handler found errors in our production logs.

So my question is, could this error be due to some bad load-balancing? Like that we send our users between different servers and the server receiving server does not have an updated state for this user/session? Or should it be some configuration error on the Spring-application that can not be affected by the load balancing?

When I have searched for other people with the same error they seem to get it all the time, but I get it only sporadically

The error we receive:

Uncaught service() exception root cause AppName: javax.servlet.ServletException: org.springframework.web.portlet.NoHandlerFoundException: No handler found for portlet request: mode 'view', phase 'ACTION_PHASE', parameters map['action' -> array<String>['myController.parameter']]