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[jetty-users] Embedded Jetty 9 handle one request at a time [expect to handle more]

I am using jetty 9 in embedded mode and even though i have given a threadpool of 500 the server still just handle one request at a time.

What am i missing ?


JAVA CODE:
// here i expect all thread name log to print instantaneously but they print one by one


public class Main {

        public static void main(String[] arg) throws Exception {

                ExecutorThreadPool executorThreadPool = new ExecutorThreadPool(Executors.newFixedThreadPool(500));
                final Server server = new Server(executorThreadPool);

                final ServerConnector connector0 = new ServerConnector(server);
                connector0.addBean(executorThreadPool);
                connector0.setPort(8080);              
            server.setHandler(new HelloHandler());
        server.setConnectors(new Connector[] {connector0});
            server.setDumpAfterStart(true);
            server.start();
            server.join();
        }
}

class HelloHandler extends AbstractHandler
{
    public void handle(String target,Request baseRequest,HttpServletRequest request,HttpServletResponse response)
        throws IOException, ServletException
    {
        try {

                System.out.println("Thread Name+" + Thread.currentThread().getName());
                        Thread.sleep(3000l);
                } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }
        response.setContentType("text/html;charset=utf-8");
        response.setStatus(HttpServletResponse.SC_OK);
        baseRequest.setHandled(true);
        response.getWriter().println("<h1>Hello World</h1>");
    }
}
POM.XML
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <groupId>Test</groupId>
        <artifactId>test</artifactId>
        <version>0.0.1-SNAPSHOT</version>

        <dependencies>
                <dependency>
                        <groupId>org.eclipse.jetty</groupId>
                        <artifactId>jetty-server</artifactId>
                        <version>9.2.6.v20141205</version>
                </dependency>
        </dependencies>
</project>

_javascript_ script i fired from my browser to test"

function httpGet(theUrl)
{
    var xmlHttp = null;

    xmlHttp = new XMLHttpRequest();
    xmlHttp.open( "GET", theUrl, true );
    xmlHttp.send( null );
    return xmlHttp.responseText;
}
for(i=0;i<20;i++) {console.log(i);httpGet("http://localhost:8080");}

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