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16411818
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2013-05-07T05:29:05.653
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2013-05-07T05:29:05.653
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2017-05-23T12:02:02.263
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680925
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7
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text
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This is a <a href="https://github.com/FasterXML/jackson-databind/issues/34" rel="nofollow noreferrer">recognized bug in Jackson</a>, which has been touted (incorrectly in my opinion) as a feature. Why do I consider it a bug? Because while serialization works, deserialization definitely does not. In any case, valid JSON cannot be generated from your current return type, so I would recommend creating a wrapper class: <pre><code>class Result<T> { private T data; // constructors, getters, setters } @GET @Path("/getInteger") @Produces(APPLICATION_JSON) public Result<Integer> getInteger() { return new Result<Integer)(42); } </code></pre> Alternatively, you can elect to wrap root values, which will automatically encapsulate your data in a top level JSON object, keyed by the objects simple type name - but note that if this option is used that all generated JSON will be wrapped (not just for primitives): <pre><code>final ObjectMapper mapper = new ObjectMapper() .configure(SerializationFeature.WRAP_ROOT_VALUE, true) .configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true); final String serializedJson = mapper.writeValueAsString(42); final Integer deserializedVal = mapper.readValue(serializedJson, Integer.class); System.out.println(serializedJson); System.out.println("Deserialized Value: " + deserializedVal); </code></pre> Output: <blockquote> {"Integer":42} Deserialized Value: 42 </blockquote> See <a href="https://stackoverflow.com/a/16384686/680925">this answer</a> for details on how to retrieve and configure your <code>ObjectMapper</code> instance in a JAX-RS environment.
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1. 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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1. COThanks! Now I finally understand that a "JSON value" and a "JSON text" are not the same. But it's indeed JSON and not Java to blame :)
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