Struts2 +Extjs的form表单上传文件，抛异常IllegalStateException

[qq_23963765]

部分js代码

var conditionPanel = new Ext.form.FormPanel({
            region:'north',
            renderTo:"left",
            fileUpload:true, 
            items:[{fieldLabel: '上传文件',xtype:'textfield',id:"image",inputType:'file',buttonText:'123',name:'image'}],
            buttons:[{
                text:"提交",
                handler:verify_submit
            }]
             

function verify_submit(){
      var submitForm = conditionPanel.getForm();
      if (submitForm.isValid()){
              submitForm.submit({
                    url:'<%=basePath%>/taskdo/task_uploadFile',
                  params:{action:'submit'},   
                  method: 'post',
                  success:function(form, action){
                 },
                 failure:function(form, action ){
                 }
          });
      }else {
               
      }
}


        });

部分java代码 这是前台调用后台的action，里面什么都没操作，我也没定义对应属性及set/get方法获取文件，点击上传，控制台依然报异常。哪位老师解惑啊

public void uploadFile() throws Exception{
         
}

2016-03-10 17:44:48[ INFO ] IllegalStateException
2016-03-10 17:44:48[ INFO ]
2016-03-10 17:44:48[ INFO ] IllegalStateException
2016-03-10 17:44:48[ INFO ]
2016-03-10 17:44:48[ INFO ] Removing file image D:\upload_72a05bdf_1535fe99240__7ffd_00000000.tmp

[qq_23963765]

引用 1 楼 Q80470101 的回复:

日志信息有显示错误出现在哪一行吗？

没有啊 ，控制台信息就是 2016-03-10 17:44:48[ INFO ] IllegalStateException 2016-03-10 17:44:48[ INFO ] 2016-03-10 17:44:48[ INFO ] IllegalStateException 2016-03-10 17:44:48[ INFO ] 2016-03-10 17:44:48[ INFO ] Removing file image D:\upload_72a05bdf_1535fe99240__7ffd_00000000.tmp

[家里敷泥呀]

日志信息有显示错误出现在哪一行吗？