@Jacksonized was introduced as experimental feature in lombok v1.18.14.

The @Jacksonized annotation is an add-on annotation for @Builder and @SuperBuilder. It automatically configures the generated builder class to be used by Jackson's deserialization. It only has an effect if present at a context where there is also a @Builder or a @SuperBuilder; a warning is emitted otherwise.

Without @Jacksonized, you would have to customize your builder class(es). With @Jacksonized, you can simply write something like this to let Jackson use the generated builder:

@Jacksonized @Builder
@JsonIgnoreProperties(ignoreUnknown = true)
public class JacksonExample {
	private List<Foo> foos;
}

This annotation is especially useful when deserializing into immutable (sub-)classes that only use @SuperBuilder to create instances. With @Jacksonized, you do not have to put the complex @SuperBuilder class header into your code just to configure it for Jackson.

This annotation does not change the behavior of the generated builder. A @Jacksonized @SuperBuilder remains fully compatible to regular @SuperBuilders.

In particular, the annotation does the following:

• Configure Jackson to use the builder for deserialization using @JsonDeserialize(builder=Foobar.FoobarBuilder[Impl].class)) on the class (where Foobar is the name of the annotated class). (An error is emitted if such an annotation already exists.)
• Copy Jackson-related configuration annotations (like @JsonIgnoreProperties) from the class to the builder class. This is necessary so that Jackson recognizes them when using the builder.
• Insert @JsonPOJOBuilder(withPrefix="") on the generated builder class to override Jackson's default prefix "with". If you configured a different prefix in lombok using setterPrefix, this value is used. If you changed the name of the build() method using using buildMethodName, this is also made known to Jackson.
• For @SuperBuilder, make the builder implementation class package-private.