See also https://github.com/weld/core/pull/187

When firing event via built-in Event bean Weld gets the event type information through reflection and the problem seems to be in org.jboss.weld.bean.builtin.AbstractFacade.getFacadeType() method.

For example for this injection point

@Inject
Event<Foo[]> fooEvent;

the result of the call to getActualTypeArguments()[0] is GenericArrayType with component type Foo (not sure why... I'd expect it to be Class).