java.lang.IllegalStateException：没有SessionManager

您缺少三件事。

• 一个上下文
• 一个会话ID经理
• 一个会话处理程序（与相关的会话管理器）

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();    }}