My custom Deserializer provide parent of the type.

[遗迹]

Hello,

I create a deserializer for match corret subclass of abstract class.

I register the deserializer for `InputMessageContent`. 

But when I call `jp.getCodec().readTree<JsonNode>(jp)` in `deserializer(JsonParser jp, DeserializationContext ctxt)`.

It return the parent element which contains  `InputMessageContent`.

But If I call jp.nextToken() before, it will works.

It's says:

input: 

{"foo": {"a": "value", "b": "something"}}

type define:

class Foo{
 InputMessageContent foo;
}

@JsonDeserialize(using = InputMessageContentDeserializer.class)
class InputMessageContent{
 String a;
 String b;
}

Output:

jp.getCodes().readTree(jp).toString()=="{"foo": {"a": "value", "b": "something"}}"
//I wish it should be "{"a": "value", "b": "something"}"   <--- If I call jp.nextToken() before.

In fact, I'm use Kotlin for this.

The source code is long:

https://paste.ubuntu.com/p/X2qSNGSQGp/

Thank you.

iseki

[Tatu Saloranta]

I agree: it should not be necessary to call `nextToken()` at that point.

But instead of 

`jp.getCodec().readTree<JsonNode>(jp)`

I would just call

`jp.readValueAsTree()`

Not sure if that makes a difference. Also make sure to use a new version of `jackson-databind` and `jackson-core`.

I hope this helps,

-+ Tatu +-

 

[遗迹]

Thank you.

I test it. Use `jp.readValueAsTree()` instead of `jp.codecs.readTree`. But the problem still exists. 

I use version is 2.9.8 (I see the lastest version is 2.9.9. But the vert.x project has using 2.9.8......)

Maybe it's a temp workaround.

在 2019年6月1日星期六 UTC+8上午7:41:25，Tatu Saloranta写道：

[遗迹]

Ah, it not makes difference. I upgrade to 2.9.9 version, but the problem still exists. Maybe I should create a issue :)

Thank you.

在 2019年6月1日星期六 UTC+8上午7:41:25，Tatu Saloranta写道：

On Fri, May 31, 2019 at 3:29 PM 遗迹 <canpo...@gmail.com> wrote:

[Tatu Saloranta]

On Sat, Jun 1, 2019 at 8:26 AM 遗迹 <canpo...@gmail.com> wrote:
>
> Ah, it not makes difference. I upgrade to 2.9.9 version, but the problem still exists. Maybe I should create a issue :)

I think that makes sense, yes.

-+ Tatu +-

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[遗迹]

Problem solved. Must register Kotlin module if using kotlin. Although I think this problem is interesting too.