Configure Jackson as JSON Provider in JAX-RS 2.0

Question

I want to use Jackson as JSON provider for my JAX-RS 2.0 webservice. For JAX-RS I use Jersey 2.0 in GlassFish 4. With JAX-RS 1.x I can add

<init-param>
  <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
  <param-value>true</param-value>
</init-param>

in my web.xml. How can i do this in Jax-RS 2.0 with Jersey 2.0? I implement a application class like this

public class MyRESTExampleApplication extends ResourceConfig {
    public MyRESTExampleApplication() {
         packages("com.carano.fleet4all.restExample");
         register(JacksonFeature.class);
    }
}

and add these lines to my web.xml.

<init-param>
    <param-name>javax.ws.rs.Application</param-name>
    <param-value>com.example.restExample.MyRESTExampleApplication</param-value>
</init-param>

But I get an exception by the request org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyWriter not found for media type=application/json, type=class ...

My pom.xml looks like this

<dependencies>
  <dependency>
    <groupId>org.glassfish.jersey.core</groupId>
    <artifactId>jersey-server</artifactId>
    <version>2.0</version>
    <scope>provided</scope>
  </dependency>
  <dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>2.0</version>
    <scope>provided</scope>
  </dependency>
</dependencies>

Thank you! Thank you! I had tried all sorts of classpath shenanigans to try and stop this error but registering the feature explicitly was the only way I could fix it — natke, May 02 '17 at 03:10

score 22 · Accepted Answer · answered Sep 12 '13 at 05:10

22

You should only need to get the implementation jar Jackson JAX-RS provider, add that to your classpath, and it should work. Version 2.x uses SPI-based auto-registration, so that you do not need anything in web.xml.

answered Sep 12 '13 at 05:10

StaxMan

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This is generally working for me, but Jackson no doesn't use my [MinIns-Annotations](http://wiki.fasterxml.com/JacksonMixInAnnotations) anymore. Do I need to register them manually now? (does it matter that I'm using glassfish 4.1?) – thomas.mc.work Mar 20 '15 at 15:53
Mix-in annotations are always explicitly registered. Maybe you are confusing mix-ins with regular annotations? With regular annotations make sure to use the right set: 1.x annotations are NOT the same as 2.x annotations -- names are same, but they live in different Java package, similar to how parser implementations are in different Java package (and have different Maven group id). – StaxMan Mar 20 '15 at 19:05

score 13 · Answer 2 · edited Feb 10 '14 at 10:39

13

The above code worked for me. JAX-RS 2.0 has auto discovery feature so it should detect your jersey-media-json-jackson.jar. I am using a Tomcat setup so, I had to explicitly call register(JacksonFeature.class) in my application as you do.

edited Feb 10 '14 at 10:39

Oliver

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answered Sep 26 '13 at 19:38

SuperNova1054

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I am getting java.lang.NoClassDefFoundError: org/codehaus/jackson/jaxrs/JacksonJaxbJsonProvider. Which version of the jersey-media-json-jackson jar do you have? what is the full path of JacksonFeature? – Dejell Feb 11 '14 at 19:10
It wasn't necessary for me to explicitly register the class with Tomcat 7. I just added this to the pom.xml: com.fasterxml.jackson.jaxrs jackson-jaxrs-json-provider 2.3.0 – Desty Feb 13 '14 at 16:24
I am experiencing the same problem. I use Jersey 2.0, Jackson 2.0 and I am not using Maven. In the Tomcat 7 lib folder I have jersey-media-json-jackson-2.3.jar and jackson-jaxrs-json-provider-2.2.3.jar. I tried to register JacksonFeature with the same NoClassDefFoundError: org/codehaus/jackson/jaxrs/JacksonJaxbJsonProvider. If I do not do this, I get: SEVERE: MessageBodyWriter not found for media type=application/json, type=class _myClass_, genericType=class _myClass_. My web.xml is essentially the same as the original poster's one. Advise, please. – Yuri P. Aug 06 '14 at 20:03

Configure Jackson as JSON Provider in JAX-RS 2.0

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