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JsonTypeInfo does not serialize when using Jackson with Jersey

I annotated the JAXB class with JsonTypeInfo so that I can easily serialize polymorphic classes. However, the annotation does not appear when serializing Jersey. To be more specific, it appears when using ObjectMapper, but not as a return type from a resource. I am very confused right now, as this seems to be a problem with the interaction of Jersey => Jackson.

To debug things, I used the jsonfromjaxb example from jersey-samples to localize my problem. I added the following to the Flights class to convert it to @class.

@JsonTypeInfo(use=JsonTypeInfo.Id.CLASS, include=JsonTypeInfo.As.PROPERTY, property="@class")

I have the following methods available in the resource: one that simply returns a JAXB object and one that manually uses ObjectMapper

@GET
@Produces({"application/json"})
public synchronized Flights getFlightList() {
    return myFlights;
}

@GET
@Path("/object_mapper")
@Produces({"application/json"})
public synchronized String getFlights() throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    return mapper.writeValueAsString(myFlights);
}

Request Result / jsonfromjaxb / flights

{"flight":[{"flightId":"OK123","company":"Czech Airlines","number":123,"aircraft":"B737"},{"flightId":"OK124","company":"Czech Airlines","number":124,"aircraft":"AB115"}]}

/jsonfromjaxb/flights/object _mapper

{"@class":"com.sun.jersey.samples.jsonfromjaxb.jaxb.Flights","flight":[{"number":123,"company":"Czech Airlines","aircraft":"B737","flightId":"OK123"},{"number":124,"company":"Czech Airlines","aircraft":"AB115","flightId":"OK124"}]}

, Ransom

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