JAVA-3815: Pojo Codec - Detect property models on extended interfaces

[jflorencio]

If we have an interface like:

public interface SampleInterface {
  int getFirst();
  String getSecond();
}

which is implemented as:

public abstract class SampleImplementor implements SampleInterface {
  public abstract boolean isThird();
}

and has a concrete implementation that's called SampleImplementorImpl.
When PojoBuilderHelper goes to create the property models, it only checks
for methods on the current class and super classes - not interfaces. In
the above example, this means the property model will only have "third" entry -
no "first" or "second" property model. Today, you can manually get around that by
creating a @BsonCreator by hand:

public abstract class SampleImplementor implements SampleInterface {
  @BsonCreator
  public static SampleImplementor newInstance(
    @BsonProperty("first") int first,
    @BsonProperty("second") String second,
    @BsonProperty("third") boolean third) {
    return new SampleImplementorImpl(first, second, third);
  }

  public abstract boolean isThird();
}

The presence of the @BsonProperty on the @BsonCreator method will
create the property models. Conversely though, if you want to leverage a
Convention implementation to dynamically create a InstanceCreator
that knows how to find SampleImplementorImpl above, you won't be able
to. InstanceCreator is only provided properties for which
PropertyModel exists, so above, since PojoBuilderHelper didn't
discover the interface fields, and there is no exposed API to add
property models, your InstanceCreator will never be provided the
first and second fields present on the interface.

Simply put, if you provide the pojo codec a class that is not concrete,
extends an interface for methods, and does not have a @BsonCreator
annotation, there is no way to implement a InstanceCreator
implementation that works for the non concrete class. You get stuck in
a place where the class can serialize since the concrete implementation
SampleImplementorImpl is provided at runtime, but then you have no way
to deserialize it since usages in the code only reference SampleImplementor.

We've worked around this problem for years and created 700+ hand written
@BsonCreator annotations, so at this point I want to fix actual the problem.

This fix is relatively straight forward: Update PojoBuilderHelper to
scan implementing classes and interfaces, which provides a fully
populated property model.

JAVA-3815

[jflorencio]

Is there anything I can do to help make progress on this?