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POHow can I customize serialization of a list of JAXB objects to JSON?
 

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  1. POHow can I customize serialization of a list of JAXB objects to JSON?
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    <p>I'm using Jersey to create a REST web service for a server component.</p> <p>The JAXB-annotated object I want to serialize in a list looks like this:</p> <pre><code>@XmlRootElement(name = "distribution") @XmlType(name = "tDistribution", propOrder = { "id", "name" }) public class XMLDistribution { private String id; private String name; // no-args constructor, getters, setters, etc } </code></pre> <p>I have a REST resource to retrieve one distribution which looks like this:</p> <pre><code>@Path("/distribution/{id: [1-9][0-9]*}") public class RESTDistribution { @GET @Produces("application/json") public XMLDistribution retrieve(@PathParam("id") String id) { return retrieveDistribution(Long.parseLong(id)); } // business logic (retrieveDistribution(long)) } </code></pre> <p>I also have a REST resource to retrieve a list of all distributions, which looks like this:</p> <pre><code>@Path("/distributions") public class RESTDistributions { @GET @Produces("application/json") public List&lt;XMLDistribution&gt; retrieveAll() { return retrieveDistributions(); } // business logic (retrieveDistributions()) } </code></pre> <p>I use a ContextResolver to customize JAXB serialization, which is currently configured like this:</p> <pre><code>@Provider @Produces("application/json") public class JAXBJSONContextResolver implements ContextResolver&lt;JAXBContext&gt; { private JAXBContext context; public JAXBJSONContextResolver() throws Exception { JSONConfiguration.MappedBuilder b = JSONConfiguration.mapped(); b.nonStrings("id"); b.rootUnwrapping(true); b.arrays("distribution"); context = new JSONJAXBContext(b.build(), XMLDistribution.class); } @Override public JAXBContext getContext(Class&lt;?&gt; objectType) { return context; } } </code></pre> <p>Both REST resources work, as well as the context resolver. This is an example of output for the first one:</p> <pre><code>// path: /distribution/1 {"id":1,"name":"Example Distribution"} </code></pre> <p>Which is exactly what I want. This is an example of output for the list:</p> <pre><code>// path: /distributions {"distribution":[{"id":1,"name":"Sample Distribution 1"},{"id":2,"name":"Sample Distribution 2"}]} </code></pre> <p>Which is not quite what I want.</p> <p>I don't understand why there is an enclosing <code>distribution</code> tag there. I wanted to remove it with <code>.rootUnwrapping(true)</code> in the context resolver, but apparently that only removes another enclosing tag. This is the output with <code>.rootUnwrapping(false)</code>:</p> <pre><code>// path: /distribution/1 {"distribution":{"id":1,"name":"Example Distribution"}} // not ok // path: /distributions {"xMLDistributions":{"distribution":[{"id":1,"name":"Sample Distribution 1"},{"id":2,"name":"Sample Distribution 2"}]}} </code></pre> <p>I also had to configure <code>.arrays("distribution")</code> to always get a JSON array, even with only one element.</p> <p>Ideally, I'd like to have this as an output:</p> <pre><code>// path: /distribution/1 {"id":1,"name":"Example Distribution"} // currently works // path: /distributions [{"id":1,"name":"Sample Distribution 1"},{"id":2,"name":"Sample Distribution 2"}] </code></pre> <p>I tried to return a <code>List&lt;XMLDistribution&gt;</code>, a <code>XMLDistributionList</code> (wrapper around a list), a <code>XMLDistribution[]</code>, but I couldn't find a way to get a simple JSON array of distributions in my required format.</p> <p>I also tried the other notations returned by <code>JSONConfiguration.natural()</code>, <code>JSONConfiguration.mappedJettison()</code>, etc, and couldn't get anything resembling what I need.</p> <p>Does anyone know if it is possible to configure JAXB to do this?</p>
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