Problem to serialize empty object [Jackson]

[tnferreira]

I want to create a service that retrieve some objects from DDS and expose as a REST web service (json). My model classes was generated by DDS tool (.idl) and I could change it.

But I'm getting this error. How could I change this configuration on Switchyard ?

org.codehaus.jackson.map.JsonMappingException: No serializer found for class br.com.dds.generated.FacilityStatus and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.ArrayList[0]->br.com..dds.generated.Installation["status"])

public class FacilityStatus  {

    public static final int _ACTIVE = 0;

    public static final br.com.dds.generated.FacilityStatus ACTIVE = new br.com.dds.generated.FacilityStatus(_ACTIVE);

    public static final int _INACTIVE = 1;

    public static final br.com.dds.generated.FacilityStatus INACTIVE = new br.com.dds.generated.FacilityStatus(_INACTIVE);

    public int value ()

    {

        return __value;

    }

    public static br.com.dds.generated.FacilityStatus from_int (int value)

    {

        if (value >= 0 && value < __size) {

            return __array[value];

        } else {

            throw Utilities.createException(Utilities.EXCEPTION_TYPE_BAD_OPERATION, null);

        }

    }

    protected FacilityStatus (int value)

    {

        __value = value;

        __array[__value] = this;

    }

}

[dward]

When you say "you could change it", do you mean you can, or you can't?  There is a jackson flag to change this, but by default it is looking for getter/setter pairs, which this generated java file does not have.

Aside, are you leveraging switchyard clustering in your application?  If so, this could bite you there, too...

[tnferreira]

Sorry. I couldn't change it. My app will be deployed at one jboss.

How and where do I change this flag ?

Could I register my jackson modules with my custom deserialization logic (registerModule) ? I think it's better to write my custom.

[dward]

The way this flag is set is on the Jackon ObjectMapper:

org.codehaus.jackson.map.ObjectMapper objectMapper = (however it's created or retrieved)

objectMapper.disable(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS);

However, using resteasy, I'm not sure where this is done.  I have consulted with the developer of our resteasy SwitchYard component, so let's see what he says.

[mageshbk]

Hi Thiago,

This error is thrown because the FacilityStatus constructor is protected. Can't this be made public? If not, then we need to use a custom Contextresolver.

regards,

Magesh