# Json direct to Java class?
**URL:** https://discuss.elastic.co/t/json-direct-to-java-class/6585
**Category:** Elasticsearch
**Created:** [February 3, 2012, 4:40pm UTC](https://discuss.elastic.co/t/json-direct-to-java-class/6585 "2012-02-03T16:40:12Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Ben\_Rometsch](https://discuss.elastic.co/u/Ben_Rometsch)
#### Post date: [February 3, 2012, 4:40pm UTC](https://discuss.elastic.co/t/json-direct-to-java-class/6585/1 "2012-02-03T16:40:12Z")
Hi,
I've been using XContentBuilder within the Java API to index
documents. Is there a corresponding way to populate objects with JSON
data? E.g. in Gson you can say
BagOfPrimitives obj2 = gson.fromJson(json, BagOfPrimitives.class);
Thanks
---
### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [February 3, 2012, 4:50pm UTC](https://discuss.elastic.co/t/json-direct-to-java-class/6585/2 "2012-02-03T16:50:12Z")
So you can use gson, or Jackson which is embedded in ES or your own version of Jackson.
XContentBuilder is nice when you don't need to serialize/deserialize beans.
HTH
David.
Le 3 févr. 2012 à 17:40, Ben Rometsch [ben@solidstategroup.com](mailto:ben@solidstategroup.com) a écrit :
> Hi,
>
> I've been using XContentBuilder within the Java API to index
> documents. Is there a corresponding way to populate objects with JSON
> data? E.g. in Gson you can say
>
> BagOfPrimitives obj2 = gson.fromJson(json, BagOfPrimitives.class);
>
> Thanks
---
### Author:  [@louis\_gueye](https://discuss.elastic.co/u/louis_gueye)
#### Post date: [February 3, 2012, 4:54pm UTC](https://discuss.elastic.co/t/json-direct-to-java-class/6585/3 "2012-02-03T16:54:13Z")
You can use Jackson to serialize java to json and vice-versa.
The json will have to be converted to byte array for better performance.
Feel free to read
> **[Add search features to your application, try Elasticsearch part 1 : the concepts](https://deepintojee.wordpress.com/2012/01/20/add-search-features-to-your-application-try-elasticsearch-part-1-the-concepts/)**
>
> Hi all, The ultimate goal of a search engine is to provide fast, reliable, easy to use, scalable search features to a software. But before diving into complex and technical considerations we should…
You can browse the code source (focus on SearchEngineImpl) for a working
example.
Cheers,
Louis.
2012/2/3 Ben Rometsch [ben@solidstategroup.com](mailto:ben@solidstategroup.com)
> Hi,
>
> I've been using XContentBuilder within the Java API to index
> documents. Is there a corresponding way to populate objects with JSON
> data? E.g. in Gson you can say
>
> BagOfPrimitives obj2 = gson.fromJson(json, BagOfPrimitives.class);
>
> Thanks
--
Cordialement/Regards,
Louis GUEYE
linkedin [http://fr.linkedin.com/in/louisgueye](http://fr.linkedin.com/in/louisgueye) |
blog[http://deepintojee.wordpress.com/](http://deepintojee.wordpress.com/)|
twitter [http://twitter.com/#!/lgueye](http://twitter.com/#%21/lgueye)
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 3:40am UTC](https://discuss.elastic.co/t/json-direct-to-java-class/6585/4 "2017-07-06T03:40:42Z")