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POHow to configure JacksonJaxbJsonProvider in a single line of code?
 

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  1. POHow to configure JacksonJaxbJsonProvider in a single line of code?
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    <p>I use Jackson for JSON serialisation in a REST application like this:</p> <pre><code>import javax.ws.rs.core.Application; import org.codehaus.jackson.jaxrs.JacksonJaxbJsonProvider; import org.codehaus.jackson.map.SerializationConfig; public class MyApplication extends Application { public Set&lt;Class&lt;?&gt;&gt; getClasses() { Set&lt;Class&lt;?&gt;&gt; classes = new HashSet&lt;Class&lt;?&gt;&gt;(); classes.add(MyResource1.class); classes.add(MyResource2.class); ... return classes; } public Set&lt;Object&gt; getSingletons() { Set&lt;Object&gt; singletons = new HashSet&lt;Object&gt;(); singletons.add(new JacksonJaxbJsonProvider().configure( SerializationConfig.Feature.WRITE_NULL_PROPERTIES, false)); // (*) return singletons; } } </code></pre> <p>(*) Necessary otherwise fields annotated with @XmlElementRef will appear in JSON output as <code>"myField": null</code> when null (instead of not appearing), while it's fine for fields annotated with @XmlElement.</p> <p>However the use of <code>SerializationConfig.Feature.WRITE_NULL_PROPERTIES</code> is deprecated in favor of <code>SerializationConfig.setSerializationInclusion(..)</code> (1) which itself is deprecated in favor of <code>SerializationConfig.withSerializationInclusion(..)</code> or <em>configure through ObjectMapper</em> (2)</p> <p>But what I think is done using <code>new JacksonJaxbJsonProvider().configure(..)</code> is indeed configuring an ObjectMapper (I took a look at the code).</p> <p>So my question is: how do I configure this properly without using any deprecated property and without (re)creating new config class(es)?</p> <p>(1) <a href="http://jackson.codehaus.org/1.9.4/javadoc/org/codehaus/jackson/map/SerializationConfig.Feature.html#WRITE_NULL_PROPERTIES" rel="nofollow noreferrer">http://jackson.codehaus.org/1.9.4/javadoc/org/codehaus/jackson/map/SerializationConfig.Feature.html#WRITE_NULL_PROPERTIES</a></p> <p>(2) <a href="http://jackson.codehaus.org/1.9.4/javadoc/org/codehaus/jackson/map/SerializationConfig.html#setSerializationInclusion(org.codehaus.jackson.map.annotate.JsonSerialize.Inclusion)" rel="nofollow noreferrer">http://jackson.codehaus.org/1.9.4/javadoc/org/codehaus/jackson/map/SerializationConfig.html#setSerializationInclusion(org.codehaus.jackson.map.annotate.JsonSerialize.Inclusion)</a></p>
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