Hi,
Here's a question I've posted on SO - crossposting here in hope of getting
some domain-expertise.
I have a 3rd party Lombok builder POJO, one that I cannot modify, that I
want to serialize using jackson. Notably it does *not* have a
NoArgsConstructor.
@Data@Builderpublic class ExternalClass {
private String name;
private String data;
// etc.}
On the surface this would appear to be simple, but it is incredibly
frustrating in practice as each possible option seems to be counteracted by
a different complication. In essence, I'm having trouble getting an
*external* Lombok *builder* to work with a jackson *mixin*.
Lombok produces fluent setters of the style .name(String name) while
Jackson's built-in builder deserializer expects .withName(String name).
Lombok documentation, and recipes elsewhere such as here
<https://stackoverflow.com/questions/4982340/jackson-builder-pattern> suggest
using @JsonDeserialize(builder=ExternalClass.ExternalClassBuilder.class) in
conjunction with @JsonPOJOBuilder(withPrefix="") on a predeclared inner
stub builder. But this is not possible because the Lombok class is in an
external library.
Applying these annotations to a mixin has no effect.
@JsonDeserialize(ExternalClass.ExternalClassBuilder.class)public abstract class
ExternalClassMixin {
@JsonPOJOBuilder(withPrefix="")
public static ExternalClassBuilder {
}}
The only approach I've found that works is to leverage the package-access
AllArgsConstructor created by @Builder and populate the mixin with the
following constructor
public abstract class ExternalClassMixin {
@JsonCreator public ExternalClassMixin(
@JsonProperty("name") String name,
@JsonProperty("data") String data,
// etc.
) {} }
This is obviously not desirable as it requires iterating and hard-coding
every class property explicitly, making the mixin fragile to any change in
the external POJO.
My question is - is there a robust, maintainable way to serialize this
external builder class using Jackson without modifying it, using either a
mixin or maybe a full blown deserializer?
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