@JacksonXmlProperty with attributes raises an exception when used with @JsonIdentityInfo (original) (raw)

I'm running into an issue with version 2.8.9, which might be related to issue #81 / #82: I'm trying to serialize an object graph with a circular reference using JsonIdentityInfo. This works well unless the referenced object has properties marked with @JacksonXmlProperty( isAttribute = true )

Minimal example below:

@JsonIdentityInfo( generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "id" ) @JacksonXmlRootElement( localName = "a" ) public class A { public static void main( String[] args ) throws IOException { final A a = new A(); a.b = new B(); a.b.setA( a ); //B has a reference back to A

    final XmlMapper mapper = new XmlMapper();
    final String json = mapper.writeValueAsString( a );
    System.out.println( json );
}

private B b;

private String name = "test";


@JacksonXmlProperty( isAttribute = true ) //test runs with isAttribute set to false (but serializes name as an element)
public String getName() {
    return name;
}

//other getter/setter omitted for brevity

Expected output:

Instead the exception:

 Exception in thread "main" com.fasterxml.jackson.databind.JsonMappingException: Unexpected IOException (of type java.io.IOException): javax.xml.stream.XMLStreamException: Trying to write an attribute when there is no open start element.
    at com.fasterxml.jackson.databind.JsonMappingException.fromUnexpectedIOE(JsonMappingException.java:333)
    at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:3077)
    at test.A.main(A.java:20)

is thrown. Removing the JsonIdentityInfo annotation solves the issue as well, i.e. name is correctly serialized as an attribute, but then a circular reference causes a stack overflow - obviously.