In this scenario, multiple Access Manager servers are deployed in session failover mode behind a load balancer configured for cookie-based sticky request routing. The Access Manager administrator accesses the Access Manager Console through the load balancer. When the administrator logs into the Console, the session is created on one of the Access Manager servers. If that server goes down, the Console session fails over to another Access Manager server, as expected. The administrator, however, sometimes experiences intermittent null pointer exceptions on the browser and in the web-container error log.
The issue affects only the active Access Manager Console session at the time of the failover and not the functioning of the Access Manager servers.
Workaround: To prevent these intermittent null pointer exceptions:
For a temporary solution, refresh the browser, or log out and then back into the Console.
For a permanent solution, deploy the Access Manager Console on a separate Access Manager instance that does not participate in the session failover.