Is it possible to user @JsonIdentityInfo with ObjectIdGenerators.PropertyGenerator when the IDs from different entity types overlap?
jackson, java, xml
Solution
You might have found the answer already, but in case you didn't...
You should be able to use the scope parameter of the @JsonIdentityInfo for that, i.e.,
@JsonIdentityInfo(scope=Foo.class, property="id", generator=ObjectIdGenerators.PropertyGenerator.class)
public class Foo { ... }
and
@JsonIdentityInfo(scope=Bar.class, property="id", generator=ObjectIdGenerators.PropertyGenerator.class)
public class Bar { ... }
Problem
Is it possible to user @JsonIdentityInfo with ObjectIdGenerators.PropertyGenerator when the IDs from different entity types overlap? Assume that I have the following XML and want to deserialize it with Jackson 2.x: ``` <foo> <id>3</id> <name>Peter</name> <bar> <id>3</id> <kind>dog</kind> <!--belongsTo>3</belongsTo--> </bar> </foo> ``` I've annotated the Foo and Bar class with `@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")`. The deserialization fails with `com.fasterxml.jackson.databind.JsonMappingException: Already had POJO for id (java.lang.String) [3]`. If bar has the id 4, everything works fine. What are the requirements regarding the IDs in XML to be deserialized by Jackson? I have assumed that - since Jackson knows to which entity scope it would be able to work with the same id as long as it belongs to different types. P.S.: It doesn't seem to matter the belongsTo reference (pointing to a foo object) is set or not.