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POJAX-RS / Jersey ".get(Integer.class)" and single JSON primitive (Integer) values?
 

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  1. POJAX-RS / Jersey ".get(Integer.class)" and single JSON primitive (Integer) values?
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    <p>I have a JAX-RS WebService with the following method:</p> <pre><code>@Path("/myrest") public class MyRestResource { ... @GET @Path("/getInteger") @Produces(APPLICATION_JSON) public Integer getInteger() { return 42; } </code></pre> <p>When accessed using this snipped:</p> <pre><code>@Test public void testGetPrimitiveWrapers() throws IOException { // this works: assertEquals(new Integer(42), new ObjectMapper().readValue("42", Integer.class)); // that fails: assertEquals(new Integer(42), resource().path("/myrest/getInteger").get(Integer.class)); } </code></pre> <p>I get the following exception:</p> <pre><code>com.sun.jersey.api.client.ClientResponse getEntity SEVERE: A message body reader for Java class java.lang.Integer, and Java type class java.lang.Integer, and MIME media type application/json was not found com.sun.jersey.api.client.ClientResponse getEntity SEVERE: The registered message body readers compatible with the MIME media type are: application/json ... </code></pre> <p>The problem is just with returning single primitive values (int/boolean) or their wrapper classes. Returning other POJO classes is not the problemen so I guess all the answers regarding JSONConfiguration.FEATURE_POJO_MAPPING and JAXB annotations do not apply here. Or which annotation should I use to describe the return type if I don't have access to its class source?</p> <p>Using ngrep I can verify that just the String "42" is returned by the webservice. Thats a valid JSON "value" but not a valid JSON "text" according to the spec. So is my problem on the client or the server side?</p> <p>I tried activating JSONConfiguration natural/badgerfish according to <a href="http://tugdualgrall.blogspot.de/2011/09/jax-rs-jersey-and-single-element-arrays.html" rel="nofollow">http://tugdualgrall.blogspot.de/2011/09/jax-rs-jersey-and-single-element-arrays.html</a> but with no success (ngrep still shows just "42"). Would that be the right path?</p> <p>Any ideas are appreciated!</p>
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    1. USlathspell
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    1. COIs it important that the media type of the returned value be "application/json"? Since it's just text, why not set `@Produces("text/plain")`. If you really need the "application/json" media type, you could write a custom MessageBodyWriter.
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      1. USbdkosher
 

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