Using Jersey 2.x , use Interface

SampleClass.java

import javax.ws.rs.FormParam;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

// [!!] Jersey is trying to instantiate the interface, which it can't.
// @Path("/hoge")
public interface SampleClass 
{
	@GET
	@Path("/p1")
	@Produces(MediaType.TEXT_PLAIN + "; charset=UTF-8")
	public String saySomething();
	
	
	@GET
	@Path("/p1/{message}")
	@Produces(MediaType.TEXT_PLAIN + "; charset=UTF-8")
	public String saySomething(@PathParam("message") String message);

	
	
	@POST
	@Path("/p1")
	@Produces(MediaType.APPLICATION_FORM_URLENCODED)
	public String postedParams(
			@FormParam ("val1") String val1, 
			@FormParam ("val2") String val2
	);
}

SampleClassImp.java

import javax.ws.rs.Path;
import myclasses.SampleClass;


@Path("/hoge")
public class SampleClassImp implements SampleClass 
{
	@Override
	public String saySomething() 
	{
		return "what?";
	}

	@Override
	public String saySomething(String message) 
	{
		return String.format("%s", message);
	}

	@Override
	public String postedParams(String val1, String val2) 
	{
		return String.format("val1 : %s , val2 : %s", val1, val2);
	}
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:web="http://java.sun.com/xml/ns/javaee"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
	id="WebApp_ID" version="3.0">
	<display-name>PracticeForWebAPIs</display-name>
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
	<servlet>
		<servlet-name>Jersey REST Service</servlet-name>
		<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
		<init-param>
			<param-name>jersey.config.server.provider.packages</param-name>
			<param-value>myclasses</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>Jersey REST Service</servlet-name>
		<url-pattern>/rest/*</url-pattern>
	</servlet-mapping>
</web-app>