[Java] Annotation-based serializer registration

[knutwannheden]

For simpler serializer registration and an improved developer experience, it would be nice if serializers could be registered via reflection on the type being serialized and / or on a property being serialized (not sure if the latter granularity can be supported).

The annotation would probably also have to have attributes for nullability and reference tracking.

See Slack message.

[chaokunyang]

What do you mean on a property? You mean add annotation on field? Seems annotation on class or should be supported too

[chaokunyang]

One of the issue for the annotation on the class is that we must write classname for deserialization, we can't sepcify a class is unless we scan the package, otherwise we don't know which class to load based on class is. But If you register class ahead, this issue won't exist. Users should choose which to use based on his cases

[chaokunyang]

For simpler serializer registration and an improved developer experience, it would be nice if serializers could be registered via reflection on the type being serialized and / or on a property being serialized (not sure if the latter granularity can be supported).

The annotation would probably also have to have attributes for nullability and reference tracking.

See Slack message.

Hi @knutwannheden , Fory support configure field nullability and reference tracking now. please see our doc:
https://fory.apache.org/docs/next/guide/java/field_configuration

public class User {
    @ForyField(id = 0)
    private long id;

    @ForyField(id = 1)
    private String name;

    @ForyField(id = 2, nullable = true)
    private String email;

    @ForyField(id = 3, ref = true)
    private List<User> friends;

    @ForyField(id = 4, dynamic = ForyField.Dynamic.TRUE)
    private Object data;
}

[knutwannheden]

Nice! Thank you for tackling this!