java.lang.IllegalStateException: No SessionManager

Question

Please give me advice how to correctly set up Jetty . I\'m using the latest version of jetty (9.0.6.v20130930). I ordered server implement concrete servlet and it doesn\'t w

Answer 1

You are missing 3 things.

• A Context
• A Session ID Manager
• A Session Handler (with associated Session Manager)

Main.java

import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.server.session.HashSessionIdManager;
import org.eclipse.jetty.server.session.HashSessionManager;
import org.eclipse.jetty.server.session.SessionHandler;

public class Main
{
    public static void main(String[] args)
    {
        MyDumpHandler dump = new MyDumpHandler();

        Server server = new Server(8080);

        // Specify the Session ID Manager
        HashSessionIdManager idmanager = new HashSessionIdManager();
        server.setSessionIdManager(idmanager);

        // Sessions are bound to a context.
        ContextHandler context = new ContextHandler("/");
        server.setHandler(context);

        // Create the SessionHandler (wrapper) to handle the sessions
        HashSessionManager manager = new HashSessionManager();
        SessionHandler sessions = new SessionHandler(manager);
        context.setHandler(sessions);

        // Put dump inside of SessionHandler 
        sessions.setHandler(dump);

        // Tree is now
        // Server
        //   + ContextHandler("/")
        //       + SessionHandler(Hash)
        //           + MyDumpHandler

        try
        {
            server.start();
            server.join();
        }
        catch (Throwable t)
        {
            t.printStackTrace();
        }
    }
}

MyDumpHandler.java

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;

public class MyDumpHandler extends AbstractHandler
{
    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
    {
        PrintWriter out = response.getWriter();
        response.setContentType("text/plain");

        try
        {
            HttpSession session = request.getSession();
            if (session.isNew())
            {
                out.printf("New Session: %s%n", session.getId());
            }
            else
            {
                out.printf("Old Session: %s%n", session.getId());
            }
        }
        catch (IllegalStateException ex)
        {
            out.println("Exception!" + ex);
            ex.printStackTrace(out);
        }
        out.close();
    }
}