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

[Galder Zamarreño (JIRA)]

Galder Zamarreño created ISPN-9072:
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             Summary: 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
             Fix For: 9.3.0.Alpha1, 9.3.0.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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