[cdi-dev] [JBoss JIRA] (CDI-360) NormalScoped Bean<T> should all be forced to implement PassivationCapable

Mark Struberg (JIRA) jira-events at lists.jboss.org
Thu Mar 28 15:38:42 EDT 2013

    [ https://issues.jboss.org/browse/CDI-360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763865#comment-12763865 ] 

Mark Struberg commented on CDI-360:

Pete, the real underlying issue is that all the PassivationCapable or not does not depend on the serialization of the contextual instance but rather on  the need to serialize away the Contextual Reference (the proxy).

How does a typical proxy look like?

public class MailService$$CdiProxy extends MailService {
  privte Bean<MailService> bean;

Now use this in the following class

public class User {
  private @Inject MailService mailSvc;

The mailSvc is actually of type MailService$$CdiProxy. And this proxy needs the Bean<MailService> to be PassivationCapable, because the passivationId is the only way to re-attach to the Bean on the other side of the serialization.
Got me? This has no whatever connection to the actual scope of the contextual instance! If you need it or not only depends on the bean you inject it INTO (aka the bean containing the InjectionPoint).

> NormalScoped Bean<T> should all be forced to implement PassivationCapable
> -------------------------------------------------------------------------
>                 Key: CDI-360
>                 URL: https://issues.jboss.org/browse/CDI-360
>             Project: CDI Specification Issues
>          Issue Type: Bug
>          Components: Beans
>    Affects Versions: 1.0
>            Reporter: Mark Struberg
>            Priority: Blocker
>             Fix For: 1.1.FD
> When serializing a Contextual Reference of a CDI bean, we need to transport over it's proxy. This proxy internally need to serialize it's Bean<T>. But this is only really possible if the Bean implements PassivationCapable. Any attempt to use the type + qualifier is doomed to fail, as this still leaves room for clashes. E.g. if an Extension registers multiple Bean<T> with Object.class and @Default qualifier but a different name (kind of Spring XML style).
> 6.6.2 comes most close to this requirement, though it doesn't really define that all NormalScoped beans really need to implement PassivationCapable. At least it seems to point into the right direction - but it's nowhere near a clear definition.
> We should force Containers to check whether Bean<T> which serve a NormalScoped scope do implement PassivationCapable.

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