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https://issues.apache.org/jira/browse/SLING-8706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16974912#comment-16974912
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Jörg Hoh edited comment on SLING-8706 at 11/15/19 8:11 AM:
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While I agree on the reasoning of the linked statement provided by [~sseifert],
I wonder if it's exactly matching the situation here.
Technically nothing prevents you to use Java serialization with a SlingModel,
but I would assume that it is a rather uncommon and unusual approach. When you
serialize SlingModels, then you are rather using the SlingModelExporter, and
that's a very different situation.
My intention is to force a developer to explicitly handle the case of an
optional property being {{null}}. If we extend the SlingModelExporter to handle
the {{@Optional}} there is no difference in observable behavior,
{{!optionalProp.isPresent()}} can still be treated as a property being null.
was (Author: joerghoh):
While I agree on the reasoning of the linked statement provided by [~sseifert],
I wonder if it's exactly matching the situation here.
Technically nothing prevents you to use Java serialization with a SlingModel,
but I would assume that it is a rather uncommon and unusual approach. When you
serialize SlingModels, then you are rather using the SlingModelExporter, and
that's a very different situation.
My intention is to force a developer to explicitly handle the case of an
optional property being ```null```. If we extend the SlingModelExporter to
handle the ```@Optional``` there is no difference in observable behavior,
```!optionalProp.isPresent()``` can still be treated as a property being null.
> Injections for java.util.Optional<> should be automatic optional
> -----------------------------------------------------------------
>
> Key: SLING-8706
> URL: https://issues.apache.org/jira/browse/SLING-8706
> Project: Sling
> Issue Type: Improvement
> Components: Sling Models
> Reporter: Jörg Hoh
> Priority: Major
>
> The current approach to support optional injections requires to annotate the
> field with {{@Optional}} plus proper handling within the javacode (null
> checks etc), which can be forgotten.
> So instead of
> {code}
> @Inject @Optional
> String fieldname;
> {code}
> it should also be possible to use this
> {code}
> @Inject
> Optional<String> fieldname;
> {code}
> with the very same semantic. But the developer is forced to deal with the
> case that the value is not present.
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