[cdi-dev] Type variable check for Event.select() and Event.fire()

Hi all, I'd like to discuss the following two sentences taken from "10.2.1. The Event interface"). 1. Event.select() "If the specified type contains a type variable, an IllegalArgumentException is thrown." So what should happen if you pass a raw type like List.class? The Class.getTypeParameters() method returns [E]. Does it mean the type contains a type variable? And what about "event.select(new TypeLiteral<List<?>>() {})"? 2. Event.fire() "If the runtime type of the event object contains an unresolvable type variable, an IllegalArgumentException is thrown." To my understanding: 1. the runtime type = eventPayload.getClass() 2. get type variables = getTypeParameters() 3. unresolvable = it's not possible to resolve the variable, nor from the Event injetion point nor from the selected type (Event.select()), anything else? 3. Example snippet Should the following snippet fail or not? It currently fails in Weld during event.select(). But even if we relax the check it will not be always possible to resolve all the type variables, i.e. the subsequent {{fire()}} invocation might fail. Or am I missing anything? @Inject Event<Object> event; public void testSelectSubtypeWithWildcard() { List<String> updatedList = new ArrayList<>(); updatedList.add("foo"); Event<List<?>> child = event.select(new TypeLiteral<List<?>>() {}); child.fire(updatedList); } Thanks, Martin