[infinispan-issues] [JBoss JIRA] (ISPN-9072) Document Protobuf annotated collection null set callbacks

[Tristan Tarrant (Jira)]

     [ https://issues.jboss.org/browse/ISPN-9072?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tristan Tarrant updated ISPN-9072:
----------------------------------
    Fix Version/s: 9.4.4.Final
                       (was: 9.4.3.Final)


> Document Protobuf annotated collection null set callbacks
> ---------------------------------------------------------
>
>                 Key: ISPN-9072
>                 URL: https://issues.jboss.org/browse/ISPN-9072
>             Project: Infinispan
>          Issue Type: Task
>          Components: Documentation-Query
>    Affects Versions: 9.2.1.Final
>            Reporter: Galder Zamarreño
>            Assignee: Adrian Nistor
>            Priority: Major
>             Fix For: 9.4.4.Final
>
>
> When using collection fields in Protobuf annotated classes, empty collections are marshalled into the same value as {{null}}, because Protobuf only has repeated fields and no fields is represented as {{null}}.
> This means that if you have an entity with an empty collection, when it's deserialized the collection will be null. This can be confusing for users and should be documented.
> [~anistor] had some ideas on how to improve this:
> {code}
> <anistor> I'm thinking of a way to make this easier for users that
>     would prefer an empty collection being set instead of a
>     null. would be possible by adding a new attribute for this in
>     @ProtoField anotation
> > that'd be more predictable
> <anistor> would still not give you at deserializtion what was written
>     during serialization. we do not have a null marker
> <anistor> it would just give you an empty collection if you prefer
> <anistor> instead of null
> > that option should be enabled by default
> {code}



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