Ordering of async observers (vs sync observers) is not specified ---------------------------------------------------------------- Key: CDI-541 URL: https://issues.jboss.org/browse/CDI-541 Project: CDI Specification Issues Issue Type: Feature Request Components: Events Affects Versions: 2.0-EDR1 Reporter: Tomas Remes Fix For: 2.0 .Final I think this needs to be specified. E.g. what happens if I fire async event and have more matching sync and async observers? Are all sync observes called first in given order with no regard to async observers priority? For example: {{event.fireAsync(new Message());}} {code} public class First { void observeMessage(@Observes @Priority(2000) Message message){} } {code} {code} public class Second { void observeMessage(@ObservesAsync @Priority(2100) Message message){} } {code} {code} public class Third { void observeMessage(@Observes @Priority(2200) Message message){} } {code} {code} public class Fourth { void observeMessage(@ObservesAsync @Priority(2300) Message message){} } {code} What will be the order in this case? First, Third, Second, Fourth?