使用dwr中报错，help me

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使用dwr中报错，help me10

最近有个4级连动的下拉框。。我图省事正好最近开始学DWR 就尝试的用了下。。。结果4级连动下拉是出来了。。但是偶尔会随即报下面的错这个错不是每次都报有时候报有时候不报。。。。我现在只能肯定时使用DWR时报的这个序列化异常但为什么会报这个呢。。。

以下时错误~~

<2008-8-18 下午02时47分13秒 CST> <Error> <HTTP> <BEA-101309> <[ServletContext(id=17984913,name=nsfw,context-path=/nsfw)] could not deserialize the context attribute "org.directwebremoting.ContainerList"
java.io.NotSerializableException: org.directwebremoting.impl.DefaultContainer
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
at java.util.ArrayList.writeObject(ArrayList.java:531)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:809)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1296)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
at weblogic.servlet.internal.AttributeWrapper.convertObjectToBytes(AttributeWrapper.java:188)
at weblogic.servlet.internal.AttributeWrapper.getObject(AttributeWrapper.java:158)
at weblogic.servlet.internal.AttributeWrapper.getObject(AttributeWrapper.java:99)
at weblogic.servlet.internal.WebAppServletContext.getAttribute(WebAppServletContext.java:651)
at org.directwebremoting.impl.ContainerUtil.publishContainer(ContainerUtil.java:458)
at org.directwebremoting.servlet.DwrServlet.init(DwrServlet.java:80)
at weblogic.servlet.internal.ServletStubImpl$ServletInitAction.run(ServletStubImpl.java:1099)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.ServletStubImpl.createServlet(ServletStubImpl.java:975)
at weblogic.servlet.internal.ServletStubImpl.createInstances(ServletStubImpl.java:954)
at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:893)
at weblogic.servlet.internal.ServletStubImpl.reloadServlet(ServletStubImpl.java:804)
at weblogic.servlet.internal.ServletStubImpl.checkForReload(ServletStubImpl.java:762)
at weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.java:602)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:406)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:348)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:7047)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3902)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2773)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)
>

以下是 dwr.xml配置
    <allow>
<create creator="new" javascript="ItemsBean">
      <param name="class" value="dmnsfw.dao.dwr.ItemsBean"/>
</create>
<create creator="new" javascript="SfzmspbSer"> 
      <param name="class" value="dmnsfw.service.SfzmspbSer"/> 
      <include method="queryV_SwjgInfo"/>
      <include method="queryV_DsInfo"/>
</create>
</allow>
以下是业务层SfzmspbSer中的方法具体实现已经封装了。。。（小弟用了工厂方法模式）
public Map queryV_DsInfo()
{
return sfzmspbdao.queryV_DsInfo();
}
public Map queryV_SwjgInfo(String dsdmAndswjgdm)
{
return sfzmspbdao.queryV_SwjgInfo(dsdmAndswjgdm);
}

以下是jsp页面中的数据
    function onStarti()
    {
     SfzmspbSer.queryV_DsInfo(createList1i);
    }
    function createList1i(data)
    {
    DWRUtil.removeAllOptions("ssds");
    DWRUtil.addOptions("ssds",{0:'--请选择--'});
    DWRUtil.addOptions("ssds", data);

    for(var i=0;i<document.forms[0].ssds.length;i++)
    {

   var ssdsvalue=document.forms[0].ssds.options[i].value.substring(0,document.forms[0].ssds.options[i].value.indexOf("|"));
   var dsdm='<%=request.getAttribute("ds_dm")%>';
         if(ssdsvalue==dsdm)
         {
             document.forms[0].ssds.options[i].selected=true;
         }
    }
   }
</script>
<body onLoad="initDTTR();onStarti();">

因为第一个下拉我是页面加载时调用的。。。

求教给为dwr达人了。。。
再次强调下这个错误并不是每次都报的偶尔会报下就是 10次报个2-3次而且报这个错并不影响程序运行。。。但是哗哗的错误看的别扭想解决掉他。。。百度 google 了都找不到求教各位了。

DWR