Set Jackson JSON serialization for specific type to use toString() using ObjectMapper

Question

Using Java 17 I have a FooBar type I want serialized to JSON using its toString() method. I'm serializing using a Jackson ObjectMapper (created via a JsonMapper.Builder).

I read that I can use the @JsonValue annotation on the FooBar class FooBar.toString() method. But is there a way to configure the ObjectMapper instead, without creating some special factory class specifically for FooBar? (I did this years ago but I don't remember if I created a separate factory implementation or what.)

I was expecting (hoping for) something like this:

objectMapperBuilder.serializerFor(FooBar.class, ToStringSerializer.instance());

gdomo · Accepted Answer · 2023-06-26 17:59:06Z

5

Just use com.fasterxml.jackson.databind.ser.std.ToStringSerializer as a custom deserializer for the FooBar class:

ObjectMapper mapper = new ObjectMapper();

SimpleModule module = new SimpleModule();
module.addSerializer(FooBar.class, new ToStringSerializer());
mapper.registerModule(module);

answered Jun 26, 2023 at 17:59

gdomo

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2 Comments

Garret Wilson Over a year ago

Ah, that's it! It's coming back to me now—I had forgotten I needed to put that in a module. Thanks for taking the time to post this.

Garret Wilson Over a year ago

I added follow-up question stackoverflow.com/q/76560273 .

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