问Jetty 9中的DWR -中断反射异常

EN

<servlet>
  <description>Direct Web Remoting Servlet</description>
  <display-name>DWR Servlet</display-name>
  <servlet-name>dwr-invoker</servlet-name>
  <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>

  <!-- We're currently using Java annotations instead of a separate dwr.xml 
       config file. -->
  <init-param>
      <!-- The "classes" servlet parameter must provide a comma-separated 
           list of the fully-qualified class names of all annotated classes 
           to be used with DWR. -->
      <param-name>classes</param-name>
      <param-value>
          org.ourdomain.ourapp.ApplicationDWR, 
          org.ourdomain.ourapp.DataImportDWR
      </param-value>
  </init-param>

    <!-- Remove this unless you want to use active reverse ajax -->
    <init-param>
      <param-name>activeReverseAjaxEnabled</param-name>
      <param-value>true</param-value>
    </init-param>

    <!-- By default DWR creates application scope objects when they are first
    used. This creates them when the app-server is started -->
    <init-param>
      <param-name>initApplicationScopeCreatorsAtStartup</param-name>
      <param-value>true</param-value>
    </init-param>

    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>dwr-invoker</servlet-name>
    <url-pattern>/dwr/*</url-pattern>
  </servlet-mapping>

Error: Object {name: "dwr.engine.missingData", message: "No data received from server"}

13:12:09,621 ERROR JettyContinuationSleeper:181 - Broken reflection
java.lang.NullPointerException
        at org.directwebremoting.util.Continuation.resume(Continuation.java:107)
        at org.directwebremoting.server.jetty.JettyContinuationSleeper.wakeUp(JettyContinuationSleeper.java:177)
        at org.directwebremoting.impl.TimedAlarm$1.run(TimedAlarm.java:46)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)