5.1.x Jackson 3 make ObjectMapper configurable

[bitkid]

Describe the feature

for jackson 2.x i can access the ObjectMapper used by Vert.x by using DatabindCodec.mapper() and configure it (adding custom modules, enable/disable features etc.)

in jackson 3.x ObjectMapper is immutable and configuration can be done using JsonMapper.builder(). This happens somewhere deep in the Vert.x code and is not accessible from outside.

I would need a hook which either provides a Builder or another way to apply my configurations.

Contribution

No response

[bitkid]

my suggested fix:

• make static mapper in io.vertx.core.json.jackson.v3.DatabindCodec not final
• add method public static void updateMapper(Function<MapperBuilder<ObjectMapper, ?>, ObjectMapper> f) {
  mapper = f.apply(mapper().rebuild());
  }
• update mapper like this DatabindCodec.updateMapper(builder -> builder.enable(SerializationFeature.APPLY_JSON_INCLUDE_FOR_CONTAINERS).build());

this keeps the original configuration of the mapper (with JacksonCodec.factory and VertxModule) and gives you the builder for your own modifications

[bitkid]

#6183