We've had several reports in the WildFly forums of application runtime failures following undeployment of a separate application.

WF creates a cache instance for each web application within the same cache container. However, KeyAffinityServiceImpl registers a cache manager listener that calls stop() on a @CacheStoppedEvent. However, this event might be triggered by any cache, not necessarily the cache with to which the KeyAffinityService is associated.

The KeyAffinityServiceImpl.handleCacheStopped(CacheStoppedEvent) should only call stop() if the event.getCacheName() equals the name of the cache to which the affinity service is associated.