@XmlRootElement(name = "person")
@XmlType(propOrder = {"id", "fullName", "age"})
public class Person {
    private int id;
    private String fullName;
    private int age;
...
}

@Path("service")
public class Service {
    private static Map<Integer, Person> persons = new HashMap<>();

    static {
        for (int i = 1; i <= 10; i++) {
            Person person = new Person();
            person.setId(i);
            person.setFullName("Qwerty " + i);
            person.setAge(new Random().nextInt(40) + 1);

            System.out.println(i);

            persons.put(i, person);
        }
    }

    @GET
    @Path("/get/getPersonByIdXml/{id}")
    @Produces(MediaType.APPLICATION_XML)
    public Person getPersonByIdXml(@PathParam("id") int id) {
        System.out.println(id);
        return persons.get(id);
    }


    @GET
    @Path("/get/getPersonByIdJson/{id}")
    @Produces(MediaType.APPLICATION_JSON)
    public Person getPersonByIdJson(@PathParam("id") int id) {
        return persons.get(id);
    }

    @GET
    @Path("/get/getAllPersonsJson")
    @Produces(MediaType.APPLICATION_JSON)
    public List<Person> getAllPersons() {
        return new ArrayList<Person>(persons.values());
    }
}

<welcome-file-list>
    <welcome-file>index.html</welcome-file>
</welcome-file-list>


    <listener>
        <listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
    </listener>

    <servlet>
        <servlet-name>Resteasy</servlet-name>
        <servlet-class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Resteasy</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
    <context-param>
        <param-name>resteasy.scan</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>resteasy.servlet.mapping.prefix</param-name>
        <param-value>/</param-value>
    </context-param>