Hi all,
Since I switched from Jackson 2.8.7 to 2.9.2, serializing a class, which
does not specify a @JsonTypeName like in this example:
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include =
JsonTypeInfo.As.PROPERTY, property = "_type")
@JsonTypeIdResolver(CustomTypeNameIdResolver.class)
public class BaseClassWithoutJsonTypeName {
public boolean b;
}
leads to the following JSON output:
{"type":"null","b":true}
Remark: The CustomTypeNameIdResolver returns null if no @JsonTypeName
annotation can be found on the class.
Using Jackson 2.8.7 the JSON output was:
{"b":true}
Looking at the sourcecode I found the following piece of code in 2.8.7:
AsPropertyTypeSerializer:
@Override
public void writeTypePrefixForObject(Object value, JsonGenerator jgen)
throws IOException
{
final String typeId = idFromValue(value);
if (typeId == null) {
jgen.writeStartObject();
} else if (jgen.canWriteTypeId()) {
jgen.writeTypeId(typeId);
jgen.writeStartObject();
} else {
jgen.writeStartObject();
jgen.writeStringField(_typePropertyName, typeId);
}
}
It seems like this class was refactored on the way to version 2.9.2, since
I could not found a corresponding null-check in 2.9.2.
Was this change in writing "null" values for type properties on purpose? Is
there a way to get the old behaviour back?
Regards,
Paolo
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