[cdi-dev] [JBoss JIRA] (CDI-169) Remove the 'No type variable in event objects' restriction

[Pete Muir (Issue Comment Edited) (JIRA)]

    [ https://issues.jboss.org/browse/CDI-169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12639720#comment-12639720 ] 

Pete Muir edited comment on CDI-169 at 11/3/11 10:53 AM:
---------------------------------------------------------

I had a long chat with Jozef on this. The issue is that the JDK/JVM offers no way to detect the concrete values of the type variables. For example:

{code}
class Foo<T> {}

class Bar {

   @Inject Event<Foo<Baz>> evt;

   public void doIt() {
      evt.fire(new Foo<Baz>());
}
{code}

It's not possible to detect that Baz is the generic type in this situation, the JVM erases this info.
                
      was (Author: petemuir):
    I had a long chat with Jozef on this. The issue is that the JDK/JVM offers no way to detect the concrete values of the type variables. For example:

{code}
class Foo<T> {}

class Bar {

   @Inject Event<Foo<Baz>> evt;

   public void doIt() {
      evt.fire(new Foo<Baz>());
}

It's not possible to detect that Baz is the generic type in this situation, the JVM erases this info.
                  
> Remove the 'No type variable in event objects' restriction
> ----------------------------------------------------------
>
>                 Key: CDI-169
>                 URL: https://issues.jboss.org/browse/CDI-169
>             Project: CDI Specification Issues
>          Issue Type: Feature Request
>    Affects Versions: 1.0
>            Reporter: Stuart Douglas
>             Fix For: 1.1 (Proposed)
>
>
> CDI 10.1 states:
> An event object is an instance of a concrete Java class with no type variables. ... An event type may not contain a type variable.
> Which seems silly considering the container fires events with a type variable at startup. I can't think of any reason why this should be prohibited. 

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