Jersey JSON serialization

Question

I set up an eclipse WebApp project and placed Jersey and Jackson JARs in the WEB-INF/lib directory. I want to use JSON serialization but didn\'t manage to fix this error:

Answer 1

All you need is to register JacksonJsonProvider. There are many ways to achieve that:

1. Register the JacksonJsonProvider explicitly in web.xml:

    jersey.config.server.provider.classnames
    com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider

or

2. Register your class extending javax.ws.rs.core.Application in the web.xml

    javax.ws.rs.Application
    com.rest.MyApplication

and then do all the configuration in the application class:

package com.rest;

import org.glassfish.jersey.server.ResourceConfig;
import com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider;

public class MyApplication extends ResourceConfig {

    public MyApplication() {
        packages("com.rest");
        register(JacksonJsonProvider.class);
    }

ResourceConfig is a subclass of javax.ws.rs.Application and gives you some helper methods that makes the registration easy.

or

3. Use automatic registration. Just add dependency to jersey-media-json-jackson

    org.glassfish.jersey.media
    jersey-media-json-jackson
    2.13

But be careful. It will register more than you need:

• JacksonJaxbJsonProvider,
• JsonParseExceptionMapper,
• JsonMappingExceptionMapper

Take a look at the source code to see what it does.