[cdi-dev] [JBoss JIRA] (CDI-583) Observer resolution doesn't support Lambdas

Observer resolution doesn't support Lambdas ------------------------------------------- Key: CDI-583 URL: https://issues.jboss.org/browse/CDI-583 Project: CDI Specification Issues Issue Type: Bug Components: Events Affects Versions: 1.2.Final, 2.0-EDR1 Reporter: Antoine Sabot-Durand As stated in various discussion on JDK8, lambda expressions don't allow to retrieve parameter types by reflection. See: http://jdk8-dev.openjdk.java.narkive.com/bSPiKxap/jdk-8-lambda-reflection... As section 10.1 of the spec states: bq. The event types of the event include all superclasses and interfaces of the runtime class of the event object. In case of a lambda payload, observer resolution will fails when respecting the rule above since parameter type won't be retrieve from the lambda. For instance the following code {code} @Inject Event<Supplier<String>> stringSupplierEvent; ... Supplier<String> stringSupplier = () -> "Hello world"; stringSupplierEvent.fire(stringSupplier); {code} will triggers an observer for {{Supplier}} but not an observer for {{Supplier<String>}}.