I'm trying to understand how to do JSON deserialization using Jackson. My JSON looks like this:
{
"__type": "base",
"__ConfigAType": "Sona",
"sonaString": "some test string",
"allRequiredSchemas": "[\"abc\"]",
"stepName": "GL1",
"preReq": []
}
My classes look like this:
public class Step {
private String stepName;
private List<Step> preReq;
private ModuleConfig moduleConfig;
}
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "__type")
@JsonSubTypes({
@JsonSubTypes.Type(value = BaseConfig.class, name = BaseConfig.TYPE)
})
public interface ModuleConfig {
}
public class BaseConfig implements ModuleConfig {
public static final String TYPE = "base";
}
@JsonAutoDetect(getterVisibility = JsonAutoDetect.Visibility.PUBLIC_ONLY)
@JsonTypeName(SonaConfig.TYPE)
@JsonTypeInfo(
use = JsonTypeInfo.Id.NAME,
include = JsonTypeInfo.As.PROPERTY,
property = "__ConfigAType")
@JsonSubTypes({
@JsonSubTypes.Type(value = SonaConfig.class, name = SonaConfig.TYPE)
})
public abstract class ConfigA extends BaseConfig {
public static final String TYPE = "ConfigA";
private List<String> allRequiredSchemas;
abstract Boolean execute(String input);
abstract String getConfigAType();
}
public class SonaConfig extends ConfigA {
public static final String TYPE = "SONA";
private String sonaString;
@Override Boolean execute(String input) {
return true;
}
@Override String getConfigAType() {
return "Sona";
}
}
When I try to deserialize the JSON into a Step Class I get the following error:
com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "__type"
I'm parsing it the following way:
Step x = new ObjectMapper().readerFor(Step.class).readValue(json);
Because the field preReq will contain a list of objects of type Step, I would ideally like it to reference another JSON blob instead of creating one giant JSON. Hence I've a class of type BaseConfig and my plan is to have a RefConfig which can read references to other JSON files.
