Simpe JacksonJaxbJsonProvider within JAX-RS activator

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package uk.co.jmkg.jaxrstesting.jaxrs;

import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.jaxrs.json.JacksonJaxbJsonProvider;
import com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider;
import java.util.HashSet;
import java.util.Set;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;
import uk.co.jmkg.jaxrstesting.resources.CustomerResource;

/**
 *
 * @author jamesgreen
 */
@ApplicationPath("/rest")
public class Activator extends Application {

    @Override
    public Set<Class<?>> getClasses() {
        Set<Class<?>> classes = new HashSet<Class<?>>();
        classes.add(CustomerResource.class);
        return classes;
    }


    @Override
    public Set<Object> getSingletons() {
        Set<Object> objects = new HashSet<Object>();
        JacksonJsonProvider provider = new JacksonJaxbJsonProvider();
//        provider.configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true);
        provider.configure(SerializationFeature.WRAP_ROOT_VALUE, true);
        provider.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        objects.add(provider);
        return objects;
    }

}