To have a JAX-WS Webservice in Java 6 or higher with multiple threads, it is necessary to assign an corresponding Executor to the endpoint (the sample uses 5 threads). This extends the example from this article

[java] import java.util.concurrent.Executors;
import javax.xml.ws.Endpoint;
import com.sun.net.httpserver.HttpContext;
import com.sun.net.httpserver.HttpServer;

httpServer = HttpServer.create(new InetSocketAddress(interfaceName, port), 0);
HttpContext httpContext = httpServer.createContext("/path");
Endpoint endpoint = Endpoint.create(serviceImpl);
endpoint.setExecutor(Executors.newFixedThreadPool(5));
endpoint.publish(httpContext);
[/java]