Examples for working with JSON in Play Framework 2 with Java

• String to JSON:  <pre class="brush: plain; title: ; notranslate" title="">JsonNode json = mapper.readTree(notification.getSharedData());</pre>

• Json to Object:  <pre class="brush: plain; title: ; notranslate" title="">Asset asset = mapper.readValue(a.toString(), Asset.class)</pre>

• Json to extisting Object:  <pre class="brush: plain; title: ; notranslate" title="">asset = mapper.readerForUpdating(asset).readValue(assetJson.toString())</pre>

• Object to JsonString: <pre class="brush: plain; title: ; notranslate" title="">mapper.writeValueAsString(new ResultDocument(document))</pre>

• Convert Object ot JsonNode: <pre class="brush: plain; title: ; notranslate" title="">JsonNode documentNode = mapper.convertValue(document, JsonNode.class);</pre>

  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);</pre>

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