JSON with JAXB using Maven - json

Question

I am using Jersey (with Jetty) and Maven to implement a RESTful service. I am trying to send a JSONObject using JAXB, I have followed some tutorials such as: http://jersey.java.net/nonav/documentation/1.7/user-guide.html#d4e919 and http://www.vogella.com/articles/REST/article.html
So I just have a simple bean that I want to send as a JSON Object. I have followed all the steps, but I am not able to send the JSON Object (although I do recieve the XML format correctly). I obtain the following exception: com.sun.jersey.api.MessageException: A message body writer for Java class de.vogella.jersey.jaxb.model.Todo, and Java type class de.vogella.jersey.jaxb.model.Todo, and MIME media type application/json was not found
I have tried different solutions that I found around, but nothing seems to work.
I am wondering if I must have any dependencies missing or I have to implement a ContextResolver (although any tutorials use them for easy objects like these ones).
These are the dependencies that I have:
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- Jersey -->
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-server</artifactId>
<version>1.11</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-servlet</artifactId>
<version>1.11</version>
</dependency>
<!-- Json -->
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>1.11</version>
</dependency>
<!-- Jetty -->
<dependency>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty</artifactId>
<version>6.1.26</version>
</dependency>
</dependencies>
Thank you very much

Answer 1

I have found the missing dependency:
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.0.0</version>
<scope>compile</scope>
</dependency>
And I had to add a repository as well to avoid missing archetypes errors:
<repositories>
<repository>
<id>EclipseLink Repo</id>
<url>http://www.eclipse.org/downloads/download.php?r=1&nf=1&file=/rt/eclipselink/maven.repo</url>
</repository>
</repositories>