--- title: "Examples for working with JSON in Play Framework 2 with Java" date: 2014-03-18T20:32:35+00:00 author: "poornerd" tags: ["json"] canonical: https://www.poornerd.com/2014/03/18/examples-for-working-with-json-in-play-framework-2-with-java/ source: Raw Markdown twin of the HTML article; content is the original source. --- * String to JSON:

JsonNode json = mapper.readTree(notification.getSharedData());

* Json to Object:

Asset asset = mapper.readValue(a.toString(), Asset.class)

* Json to extisting Object:

asset = mapper.readerForUpdating(asset).readValue(assetJson.toString())

* Object to JsonString:

mapper.writeValueAsString(new ResultDocument(document))

* Convert Object ot JsonNode:

JsonNode documentNode = mapper.convertValue(document, JsonNode.class);

This causes an error – `Caused by: com.fasterxml.jackson.databind.JsonMappingException: Direct self-reference leading to cycle` so do this workaround:

String messageJson = null;

String documentAsString = BaseApiController.mapper.writeValueAsString(document);

JsonNode documentNode = BaseApiController.mapper.readTree(documentAsString);