JAX-RS application without an Application subclass

build.gradle

group 'ir.iterator'
version '1.0-SNAPSHOT'

apply plugin: 'java'
apply plugin: 'war'

sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.11'

    // https://mvnrepository.com/artifact/org.glassfish.jersey.core/jersey-server
    compile group: 'org.glassfish.jersey.core', name: 'jersey-server', version: '2.25.1'

    // https://mvnrepository.com/artifact/org.glassfish.jersey.containers/jersey-container-servlet
    compile group: 'org.glassfish.jersey.containers', name: 'jersey-container-servlet', version: '2.25'

}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
         xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

    <servlet>
        <servlet-name>javax.ws.rs.core.Application</servlet-name>
    </servlet>

    <servlet-mapping>
        <servlet-name>javax.ws.rs.core.Application</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
</web-app>

HelloWorldResource.java

@Path("hello")
public class HelloWorldResource {

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    @Path("get")
    public String sayhello() {
        return "hello";
    }
}

References
http://stackoverflow.com/questions/22994690/which-init-param-to-use-jersey-config-server-provider-packages-or-javax-ws-rs-a
https://jersey.java.net/documentation/latest/deployment.html#deployment.servlet.3.pluggability.noapp