Run into an interesting issue. Not sure if its an RI problem, or something else. Actually not even sure if its a problem just surprised me. I have two very simple main methods here: try(SeContainer container = SeContainerInitializer.newInstance() .addPackages(Pojo.class) .disableDiscovery() .initialize()) { Event<Object> event = container.getBeanManager().getEvent(); FixedThreadPoolExecutorServices executorServices = new FixedThreadPoolExecutorServices(2); CompletionStage<Pojo> completionStage = event.fireAsync(new Pojo("this is asynchronous"), NotificationOptions.ofExecutor(executorServices.getTaskExecutor())); completionStage.whenCompleteAsync((pojo, throwable) -> event.fire(new Pojo(pojo.showName() + ", and now this is synchronous"))); Thread.sleep(500L); } public static void main(String...args) throws Exception{ try(SeContainer container = SeContainerInitializer.newInstance() .addPackages(Pojo.class) .disableDiscovery() .initialize()) { Event<Object> event = container.getBeanManager().getEvent(); CompletionStage<Pojo> completionStage = event.fireAsync(new Pojo("this is asynchronous")); completionStage.whenCompleteAsync((pojo, throwable) -> event.fire(new Pojo(pojo.showName() + ", and now this is synchronous"))); Thread.sleep(500L); } } In the first, I'm using a custom executor (a 2 thread pool executor) and the latter just using the default unspecified version, which weld seems to use a fork-join pool. In both of these examples, I use the whenCompleteAsync method. in the first method, I always see the fired event being handled in a different thread than what handled the first event. In the second method, I always see the fired events both being handled in the same thread. Is that just the behavior of fork-join? Or something special happening? John ------------------------------------------------------------------------ NOTICE: This e-mail message and any attachments may contain confidential, proprietary, and/or privileged information which should be treated accordingly. If you are not the intended recipient, please notify the sender immediately by return e-mail, delete this message, and destroy all physical and electronic copies. Thank you. _______________________________________________ cdi-dev mailing list cdi-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/cdi-dev Note that for all code provided on this list, the provider licenses the code under the Apache License, Version 2 (http://www.apache.org/licenses/LICENSE-2.0.html). For all other ideas provided on this list, the provider waives all patent and other intellectual property rights inherent in such information.