MessageBodyWriter not found for media type=application/json when returning JSON in REST web service with Jersey

Question

I am trying to create a very simple REST service using Jersey. Here is the service code

@Path(\"/UserService\")
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Answer 1

Your xml was working so I assume that you have @XmlRootElement annotation in your User class.

The thing is, it knows how to convert it to xml with the annotation @XmlRootElement but it doesn't know how to convert it to JSON.

So for making it convert everything to JSON with the same annotation of xml(ie @XmlRootElement) we can add

jersey-media-moxy-.jar

or for maven users

    org.glassfish.jersey.media
    jersey-media-moxy

Also it should have a no argument constructor