You're right, forgot init(), however, the following code prints
"LinkedHashMap". If I uncomment setDefaultTyping(..) it prints "Exception"
correctly. So still, polymorphic serialisation can't be controlled for an
Object target type.
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.JsonTypeInfo.As;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import
com.fasterxml.jackson.databind.ObjectMapper.DefaultTypeResolverBuilder;
import com.fasterxml.jackson.databind.ObjectMapper.DefaultTyping;
import com.fasterxml.jackson.databind.json.JsonMapper;
import
com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
public class Main4 {
public static void main(String[] args) throws java.io.IOException,
ClassNotFoundException {
ObjectMapper mapper = JsonMapper.builder().activateDefaultTyping(
LaissezFaireSubTypeValidator.instance,
DefaultTyping.NON_FINAL, As.PROPERTY).build();
DefaultTypeResolverBuilder typeResolver =
new DefaultTypeResolverBuilder(DefaultTyping.NON_FINAL) {
@Override public boolean useForType(JavaType t) { return
Throwable.class.isAssignableFrom(t.getRawClass()); } };
typeResolver.init(JsonTypeInfo.Id.CLASS, null);
typeResolver.inclusion(JsonTypeInfo.As.PROPERTY);
mapper.setDefaultTyping(typeResolver); *// comment this*
String json=mapper.writeValueAsString(new Exception("Test"));
System.out.println(mapper.readValue(json,
Object.class).getClass()); *// prints LinkedHashMap*
}
}
By the way, you might replace NoCheckSubTypeValidator with
LaissezFaireSubTypeValidator and delete NoCheckSubTypeValidator, as it it
completely equivalent.
Thanks, Marc
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