Hello everybody

I'm building a Java EE REST Client following the official J2EE guide. So I wrote these lines of code in a Java Application (I'm using Netbeans):

package org.my.utils;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
public class RESTUtils {
    public static String RESTRequestGET(String URL, String token) {
       Client client  = ClientBuilder.newClient(); // HERE I GET THE ERROR
       Response response  = client.target(URL)
                .header("Content-Type", "application/json")
                .header("X-Auth-Token", token)
       String body = (String) response.getEntity();
       return body;

I call this method in the following code:

String responseBody = RESTUtils.RESTRequestGET(URL, token);

When I run the application I get the error

Exception in thread "main" java.lang.NoClassDefFoundError: javax/ws/rs/client/ClientBuilder
at org.my.utils.RESTUtils.RESTRequestGET(RESTUtils.ja va:33)
at org.my.pack.VMServiceConnector.getResources(VMServ iceConnector.java:31)
at testgetvm.TestGetVM.main(TestGetVM.java:26)
Caused by: java.lang.ClassNotFoundException: javax.ws.rs.client.ClientBuilder
at java.net.URLClassLoader$1.run(URLClassLoader.java: 366)
at java.net.URLClassLoader$1.run(URLClassLoader.java: 355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:4 25)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 58)
... 3 more
Java Result: 1

It seems that the compiler cannot find the ClientBuilder class even though I can access the ClientBuilder implementation (the compiled one) by Ctrl-clicking on "ClientBuilder" in my source code.

What can I do to solve this annoying problem? I could use the HttpURLConnection class to access the REST service but it's not a Java EE official solution.

Thank you