How do I create a simple JSON Jersey 2.x RESTful web service on Glassfish 4?

Question

I've spent days trying to figure this out. All I want to do is create a simple web service to return Lists of POJOs as JSON. Why is this so difficult?

I'm starting with this in my POM:

<dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-web-api</artifactId>
    <version>7.0</version>
    <scope>provided</scope>
 </dependency>
<dependency>
    <groupId>org.glassfish.jersey.containers</groupId>
    <artifactId>jersey-container-servlet</artifactId>
    <version>2.17</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>2.17</version>
</dependency>

Here is my ResourceConfig:

@ApplicationPath("reservations")
public class ApplicationConfig extends ResourceConfig {

    public ApplicationConfig() {
        packages("com.oracle.swr.ws.mavenproject3",  
                 "com.fasterxml.jackson.jaxrs.base");
    }
}

Here is my Resource:

@Path("/bookedAssets")
public class GenericResource {

    @Context
    private UriInfo context;

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public List<String> getJson() {

        List<String> strings = new ArrayList<>();
        strings.add("test");
        strings.add("test2");
        return strings;
    }
}

When I try to run it I get:

Severe: MessageBodyWriter not found for media type=application/json, type=class java.util.ArrayList, genericType=class java.util.ArrayList.

I modified my ResourceConfig to try to use JacksonFeature:

public ApplicationConfig() {
    super(GenericResource.class, JacksonFeature.class);
}

And I get this error message:

Warning: StandardWrapperValve[com.oracle.swr.ws.mavenproject3.ApplicationConfig]: Servlet.service() for servlet com.oracle.swr.ws.mavenproject3.ApplicationConfig threw exception org.jboss.weld.exceptions.UnsatisfiedResolutionException: WELD-001308: Unable to resolve any beans for Types: [org.glassfish.jersey.message.filtering.spi.ObjectProvider]; Bindings: [QualifierInstance{annotationClass=interface javax.enterprise.inject.Default, values={}, hashCode=633679645}]

I've tried many different combinations of things in my POM. No luck. I've read the Jersey documentation. No luck.

This guy says the Jersey documentation is crap and to do this instead: http://jersey.576304.n2.nabble.com/Beware-of-JacksonFeature-in-Jersey-td7581633.html. Tried it. No luck.

Does anyone have a really simple example of getting GF 4.x, Jersey 2.x, Jackson 2.x working?

Answer 1

(Per comment from @peeskillet) I replaced this:

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>2.17</version>
</dependency>

with:

<dependency>
    <groupId>com.fasterxml.jackson.jaxrs</groupId>
    <artifactId>jackson-jaxrs-json-provider</artifactId>
    <version>2.5.3</version>
</dependency>

and

packages("com.fasterxml.jackson.jaxrs.base");

with:

packages("com.fasterxml.jackson.jaxrs.json");