array to object deserialization supported ?

[Guido Rost]

Hello jackson-user group,

I am trying to deserialize the following json string:

String json = "{\"actions\":[[\"set-device-id\",[\"radius-avp\",\"nas-identifier\"]]]}";

into the object:

@JsonFormat(shape=JsonFormat.Shape.ARRAY)

@JsonTypeName("set-device-id")
static public class SetDeviceId extends TransformAction {
    public RadiusAvp radiusAvp;
    public SetDeviceId() {}

...

}

Where TransformAction is this:

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.WRAPPER_ARRAY, property = "name")
@JsonSubTypes({@JsonSubTypes.Type(TransformAction.SetDeviceId.class),...)}
@JsonTypeName("transform-action")
public abstract class TransformAction {
...
}

and RadiusAvp is:
@JsonTypeName("radius-avp")
public class RadiusAvp {

    public String attribute;

    public RadiusAvp(String attribute) {
        this.attribute = attribute;
    }
...
}

Doing this jackson errors:

Unexpected token (VALUE_STRING), expected START_ARRAY: need JSON Array to contain As.WRAPPER_ARRAY type information for class RadiusAvp at [Source: 

Is there any way of deserializing the provided json into SetDeviceId. I understand that Jackson doesn't seem to know about the RadiusAvp type since I provide no assignment to the SetDeviceId.radiusAvp field. Is there some Jackson annotation which is missing or wrong ?

[Tatu Saloranta]

I think I am missing something: what is the exact main level call to
readValue(): specifically, what is its target type? (I do not see any
class with property "actions" which must exist to match JSON Object)

-+ Tatu +-

[Guido Rost]

I left out the upper level classes:

@JsonTypeName("transform-rule")
public class TransformRule {

    @JsonProperty("condition")
    public TransformCondition condition;

    @JsonProperty("actions")
    public List<TransformAction> actions;
...

}

[Guido Rost]

I just posted the upper level class which contains the actions. 

The target type is SetDeviceId which contains a field of type RadiusAvp. The construction of that is the actual problem

[Tatu Saloranta]

On Mon, Nov 11, 2019 at 7:13 PM Guido Rost <guido...@gmail.com> wrote:
>
>
> I just posted the upper level class which contains the actions.
> The target type is SetDeviceId which contains a field of type RadiusAvp. The construction of that is the actual problem

Yes, please do tell me what I really need.

-+ Tatu +-

>
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[Guido Rost]

Hi Tatu,

here is a little runnable file which shows my problem. I can make it work the delegation to the JsonCreator (commented out in SetDeviseId) but I was hoping to avoid this.

Hopefully you can point me to what I am missing or doing wrong. Thanks so much.

import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.util.List;

public class MyProblem {

    ObjectMapper mapper;

    @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.WRAPPER_ARRAY, property = "name")

    @JsonTypeName("radius-avp")
    static public class RadiusAvp {
        public String attribute;

        public RadiusAvp() {

        }

        public RadiusAvp(String attribute) {
            this.attribute = attribute;
        }

        public String toString() {
            return "radius-avp = " + attribute;
        }
    }

    @JsonTypeName("transform-rule")
    static public class TransformRule {

        public TransformRule() {
        }

        @JsonProperty("actions")
        public List<SetDeviceId> actions;

        public String toString() {
            return "Transform-rule: " + actions.toString();

        }
    }


    @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.WRAPPER_ARRAY, property = "name")

    @JsonTypeName("set-device-id")
    static public class SetDeviceId  {

        public RadiusAvp radiusAvp;

        public SetDeviceId() {
        }

//         Uncomment this section to make this work (but we don't like this)
//        
//        @JsonCreator
//        public SetDeviceId(Object object) {
//            ObjectMapper mapper = new ObjectMapper();
//            radiusAvp = mapper.convertValue(object, RadiusAvp.class);
//        }

        public String toString() {
            return "set-device-id: " + radiusAvp.toString();
        }
    }


    public static void main(String[] args) throws Exception {

        String json = "{\"actions\":[[\"set-device-id\",[\"radius-avp\",\"nas-identifier\"]]]}";

        ObjectMapper mapper = new ObjectMapper();
        TransformRule transformRule = mapper.readValue(json, TransformRule.class);
        System.out.println(transformRule.toString());
    }
}

On Tuesday, November 12, 2019 at 3:11:30 PM UTC-8, Tatu Saloranta wrote:

On Mon, Nov 11, 2019 at 7:13 PM Guido Rost <guid...@gmail.com> wrote:
>
>
> I just posted the upper level class which contains the actions.
> The target type is SetDeviceId which contains a field of type RadiusAvp. The construction of that is the actual problem

Yes, please do tell me what I really need.

-+ Tatu +-

>
> --
> You received this message because you are subscribed to the Google Groups "jackson-user" group.

> To unsubscribe from this group and stop receiving emails from it, send an email to jackso...@googlegroups.com.

[Tatu Saloranta]

By quick look, would it not work if you declared type of delegated thing as `RadiusAvp`, not Object?

And if serialization needed, adding `@JsonValue` on that RadiusAvp field.

-+ Tatu +-

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[Guido Rost]

You're right, that works. Now it looks way better. But there is no way of Jackson creating SetDeviceId without the @JsonCreator annotation? 

Thanks  a lot ,

Guido

On Thursday, November 14, 2019 at 3:18:43 PM UTC-8, Tatu Saloranta wrote:

By quick look, would it not work if you declared type of delegated thing as `RadiusAvp`, not Object?

And if serialization needed, adding `@JsonValue` on that RadiusAvp field.

-+ Tatu +-

To view this discussion on the web visit https://groups.google.com/d/msgid/jackson-user/35ebdc5e-8084-4347-8280-06bd42127877%40googlegroups.com.

[Tatu Saloranta]

On Thu, Nov 14, 2019 at 3:41 PM Guido Rost <guido...@gmail.com> wrote:

You're right, that works. Now it looks way better. But there is no way of Jackson creating SetDeviceId without the @JsonCreator annotation? 

Nope, not as general feature. Leaving that out would open potential security holes, and there is ambiguity in 1-arg case regardless (whether it's for "{ 'name' : value }" or just "value".

Although... your specific case can be covered by custom `AnnotationIntrospector` that claims it totally saw "Creator annotation" in there regardless. So you can add logic in... I forget name of method, you can see that in `JacksonAnnotationIntrospector`.

-+ Tatu +-

 

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