In one of the last PR a 

 PriorityMap

has been implemented inside

 org.kie.api.internal.utils.ServiceDiscoveryImpl

But this map is not updated/reset from

 org.kie.api.internal.utils.ServiceDiscoveryImpl.reset()

and that lead to unconsistent situation: cachedServices are removed but they can't be repopulated, because an exception is thrown at

https://github.com/kiegroup/droolsjbpm-knowledge/blob/3b8c6100f2544987923d929cd929773fdfe40a40/kie-api/src/main/java/org/kie/api/internal/utils/ServiceDiscoveryImpl.java#L216

This ticket should add a "reset" method inside PriorityMap, and call it inside

 org.kie.api.internal.utils.ServiceDiscoveryImpl