I'm deserializing a large json value. Deeply nested within that value is a json object like the following:
{
"fieldOne": "valueOne",
"fieldTwo": {
"innerField": "innerValue"
}
}
I'm using the Jackson ObjectMapper to deserialize the large json value into a 3rd party class. Deeply nested within that 3rd party class is another 3rd party class:
public class DeepThirdPartyClass {
public String fieldOne;
}
which unfortunately is missing the fieldTwo property. I can create my own class which adds the missing field:
public class MyClass extends DeepThirdPartyClass {
public MySubObject fieldTwo;
}
How do I configure jackson so that whenever it attempts to deserialize a value to DeepThirdPartyClass, it deserializes to MyClass instead?
I reworked @olga-khylkouskaya's solution to fit my problem:
@Test
public void newDeserializer() throws Exception {
ObjectMapper objectMapper = new ObjectMapper();
SimpleModule module = new SimpleModule("DeepThirdPartyClass subclass override", new Version(1, 0, 0, "FINAL", "com.example", "deep-third-party-class-override"));
module.addDeserializer(DeepThirdPartyClass.class, new JsonDeserializer<DeepThirdPartyClass>() {
@Override
public DeepThirdPartyClass deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
return p.readValueAs(MyClass.class);
}
});
objectMapper.registerModule(module);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
String json = "{\n" +
" \"middle\": {\n" +
" \"fieldOne\": \"valueOne\",\n" +
" \"fieldTwo\": {\n" +
" \"fieldThree\": \"valueThree\"\n" +
" }\n" +
" }\n" +
"}\n";
ThirdPartyClass thirdPartyClass = objectMapper.readValue(json, ThirdPartyClass.class);
}
public class ThirdPartyClass {
public DeepThirdPartyClass middle;
}
public class InnerClass {
public String fieldThree;
}
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