Description Gul Onural 2013-06-19 13:31:51 EDT

There is an inconsistency between xml and json responses for the namedQueryUpdate API. The namedQueryUpdate returns number of records impacted  from the update. The JPA-RS wraps this Integer value in a JAXBElement as :

JAXBElement jaxbElement = new JAXBElement(new QName("result"), Integer.class, result);

The marshaller used to marshall JPA-RS responses has MarshallerProperties.JSON_INCLUDE_ROOT set to false. This causes MOXy to disregard the JAXB Element for JSON, and then it will use "value" because it needs a key (default is "value").

As a result, the XML output will look like 

<result>25</result>

while JSON output is :

{"value": 25}

The solution is to set the JSON_INCLUDE_ROOT to true for that particular API, so that the output of XML and JSON would consistently use "result".