How to disable SerializationFeature.WRAP_ROOT_VALUE for some specific POJOs?

[Juan Felipe Alvarez Saldarriaga]

I'm using JSONAPI, so I need to wrap some classes, but not all classes, there's a way to disable tis feature dynamically or from the class itself?, I'm doing this:

```

ObjectMapper objectMapper = new ObjectMapper();

objectMapper.enable(SerializationFeature.WRAP_ROOT_VALUE);

objectMapper.enable(DeserializationFeature.UNWRAP_ROOT_VALUE);

objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);

JacksonConverterFactory jacksonConverterFactory = JacksonConverterFactory.create(objectMapper);

OkHttpClient okHttpClient = new OkHttpClient();

okHttpClient.interceptors().add(new LoggingInterceptor());

Retrofit retrofit = new Retrofit.Builder()

                .baseUrl(baseUrl)

                .client(okHttpClient)

                .addConverterFactory(jacksonConverterFactory)

                .build();

```

I need some of the POJOs disable that feature, is that possible?.

Thank you. 

[Tatu Saloranta]

No, there is no way to dynamically change that on per-class basis.

It is possible to enable/disable wrapping for individual calls, however, by constructing ObjectReader/ObjectWriter with enabled/disabled SerializationFeature/DeserializationFeature, if that would help.

-+ Tatu +-

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[Juan Felipe Alvarez Saldarriaga]

Thank you, this question is better elaborate http://stackoverflow.com/questions/32972321/how-to-disable-enable-jackson-serializationfeature-wrap-root-value.

You have any example?, I try this:

http://stackoverflow.com/questions/8837018/jackson-json-deserialization-ignore-root-element-from-json/27688284#27688284

And using that ObjectMapper here:

JacksonConverterFactory jacksonConverterFactory = JacksonConverterFactory.create(myObjectMapper);

But, _readMapAndClose method is never called.

[Tatu Saloranta]

One problem is that you can not reliably change settings of `ObjectMapper`, due to concurrency limitations. I don't know if that is what happens here, but you really really should not try that on a multi-threaded system; value may or may not be visible across threads, and could cause inconsistent handling.

However: it is perfectly legal to change setting for `ObjectWriter`s and `ObjectReader`s, using `with(feature)` and `without(feature)` methods: they will not modify state of reader/writer instance, but create newly configured ones. That approach should work.

Note, too, that you can also change the root name being used via these objects with method `withRootName()`, not just whether wrapping is used.

I do not know how easy it would be to do that within an existing framework; many tend to only allow configuring of `ObjectMapper`, and not allow easy use of `ObjectReader` / `ObjectWriter`.

-+ Tatu +-