[cdi-dev] [JBoss JIRA] (CDI-45) Optional Injection Points

Thorben Janssen (JIRA) issues at jboss.org
Mon Sep 1 14:45:00 EDT 2014

    [ https://issues.jboss.org/browse/CDI-45?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12997563#comment-12997563 ] 

Thorben Janssen commented on CDI-45:

{code}Instance<T> extends Iterable<T>{code} and therefore might contain more than one MyBean instances. It would not be possible to inject only one or no MyBean instances.

I like the Java8 Optional idea. It is similar to the existing Instance approach, avoids null checks and fits to the planned Java 8 enhancements.

> Optional Injection Points
> -------------------------
>                 Key: CDI-45
>                 URL: https://issues.jboss.org/browse/CDI-45
>             Project: CDI Specification Issues
>          Issue Type: Feature Request
>          Components: Resolution
>    Affects Versions: 1.0
>            Reporter: Stuart Douglas
>             Fix For: 2.0 (discussion)
> There are occoasions where it may be useful for some injection points to be optional, e.g.
> @Inject
> @Optional 
> MyBean bean; 
> This would behave the same as a normal injection point, however it will not cause the deployment to fail if it is not satisified. 

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