How do I use the Jersey JSON POJO support?

Question

I have an object that I\'d like to serve in JSON as a RESTful resource. I have Jersey\'s JSON POJO support turned on like so (in web.xml):

Answer 1

I followed the instructions here which show how to use Jersey and Jackson POJOs(as opposed to JAXB). It worked with Jersey 1.12 as well.

Answer 2

The following worked for me. I'm using Jersey 2.7 with Jackson with Apache Felix (OSGi) running on Tomcat6.

public class MyApplication extends ResourceConfig {

    public MyApplication() {
        super(JacksonFeature.class);
        // point to packages containing your resources
        packages(getClass().getPackage().getName());
    }
}

And then, in your web.xml (or in my case, just a Hashtable), you would specify your javax.ws.rs.Application like so

<init-param>
    <param-name>javax.ws.rs.Application</param-name>
    <param-value><MyApplication.class.getName()></param-value>
</init-param>

No need to specify com.sun.jersey.config.property.pacakges or com.sun.jersey.api.json.POJOMappingFeature

Just make sure you specify dependency on

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>2.7</version>
</dependency>

Answer 3

This worked for in Jersey 2.30:

In pom.xml:

<dependency>
  <groupId>org.glassfish.jersey.media</groupId>
  <artifactId>jersey-media-json-jackson</artifactId>
  <version>2.30</version>
</dependency>

In WEB-INF/web.xml:

 <servlet>
     <servlet-name>My Jersey REST Service</servlet-name>
     <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
     <!-- ATTENTION: Use Jackson for JSON: -->
     <init-param>
        <param-name>jersey.config.server.provider.classnames</param-name>
        <param-value>org.glassfish.jersey.jackson.JacksonFeature</param-value>
     </init-param>
     <!-- ... -->
     <init-param>
         <param-name>jersey.config.server.provider.packages</param-name>
         <param-value>com.example.myapp</param-value>
     </init-param>
     <load-on-startup>1</load-on-startup>
</servlet>

Answer 4

This did it for me - Jersey 2.3.1

In the web.xml file :

<servlet>
<servlet-name>Jersey Web Application</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value><my webapp packages>;org.codehaus.jackson.jaxrs</param-value>
</init-param>
</servlet>

In the pom.xml file :

<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>2.3.1</version>
</dependency>

Answer 5

You can use @XmlRootElement if you want to use JAXB annotations (see other answers).

However, if you prefer pure POJO mapping, you must do the following (Unfortunately it isn't written in docs):

1. Add jackson*.jar to your classpath (As stated by @Vitali Bichov);
2. In web.xml, if you're using com.sun.jersey.config.property.packages init parameter, add org.codehaus.jackson.jaxrs to the list. This will include JSON providers in the scan list of Jersey.