ajax走完后台不走success也不走error

[BinZor]

最近遇到一个问题，求各位大神帮忙
我先把代码贴出来

<span >
		<input type="hidden" id="buttonValue" name="buttonValue" value="po_o_submit">
		<button  name="commit" class="Whitetext" onclick="reqoperate('po_o_submit')" value="提交">
		<img src="<%=request.getContextPath() %>/billow/ico45.gif" width="16" height="16" align="absmiddle"/>提交</button>
	</span>


	function reqoperate(op,type) {
		switch(op) {
			case "po_o_submit":{ //提交
 		        if(confirm("确定要提交吗？")){
 			      allFolw();
 		         }
				break;
		      }


	function allFolw(){
		 var val = "&val=businessId:" + examineId +"^processInstanceLifeBean:budgetAdjustProcessInstanceLife&business=yearAdjustType";
	 	 //提交后的返回值，如果不为空说明已经进入工作流状态
	 	 jQuery("val").val(val);
		 if ("" != taskId){ 
	     	tosubmit('10',taskId);
	     }else{ //如果为空，提交进入工作流状态 
	     	document.getElementById("val").value = val;
	     	tosubmit('10',taskId,val);
	     }
	 }



/**
 * 流程提交
**/

function tosubmit(processId, taskId) {
	var url = document.getElementById("basePath").value + "/requestTransition.do?taskId=" + taskId + "&pdId=" + processId;
	AjaxSubmit(url);
}

function tosubmit(processId, taskId, val) {
	var url = document.getElementById("basePath").value + "/requestTransition.do?taskId=" + taskId + "&pdId=" + processId;
	if (undefined != val) {
		url += val;
	}
	AjaxSubmit(url);
}
function AjaxSubmit(url) {------------------------------------------------------------------------------------------------------------------------------
	jQuery.ajax({                                           
     type: "POST",                                    
     url: url,                                   
     data: '',  
     success: function(msg){
     	  callback(msg);
     }    
   });   
}
function callback(data) {}

	@SuppressWarnings("unchecked")
	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) throws IOException {
		System.out.println("----------------------------------");
		User su = (User) request.getSession().getAttribute("User");
		String taskId = request.getParameter("taskId");
		String val = request.getParameter("val");
		String business = request.getParameter("business");
		Writer writer = response.getWriter();
		Long   pdIdL = 0l;
		String responseXML = ""; 
		try {
			
			if (null == taskId || "".equals(taskId.trim()) || "null".equals(taskId.trim())) {
				pdIdL = (Long) workFlowTemplateService.findWorkFlow(business, su.getSysUser().getOrgId());
				if (pdIdL == 0) {
					writer.write("error:没有为该业务表单指定相关流程");
					return null;
				}
			}			
			Map variables = new HashMap();
			if (null != val && !"".equals(val.trim())) {
			

				String[] vals = val.split("\\^");
				for (int i = 0; i < vals.length; i++) {
					String[] temp = vals[i].split(":");
					if (temp.length == 2) {
						//处理预算责任部门
						if (WorkFlowTemplate.COUNTERSIGNED_DEPARTMENT.equals(temp[0])) {
							variables.put(WorkFlowTemplate.COUNTERSIGNED_DEPARTMENT, temp[1]);
							variables.put(WorkFlowTemplate.COUNTERSIGNED_DEPARTMENT_LENGTH, temp[1].split(",").length);
						} else if (WorkFlowTemplate.BUSINESS_ID.equals(temp[0])) { //处理业务表单ID
							variables.put(temp[0], temp[1]);
						} else if ("totalCost".equals(temp[0]) || "totalFund".equals(temp[0])) {
							variables.put(temp[0], Double.parseDouble(temp[1].replace(",", "")));
						} else {
							variables.put(temp[0], temp[1]);
						}
					}
				}
			}
			List transitionInfo = null;
			if (null == taskId || "".equals(taskId.trim())) {
				variables.put(WorkFlowTemplate.DRAFTER, su.getSysUser().getUserId());
				variables.put(WorkFlowTemplate.DRAFTER_NAME, su.getSysUser().getUsername());
				variables.put(WorkFlowTemplate.DRAFTER_ORG, su.getSysUser().getOrgId());
				variables.put(WorkFlowTemplate.DRAFTER_ORG_NAME, su.getSysUser().getOrgname());
				transitionInfo = templateParseTransition.parseDrafterTransition(pdIdL, variables, su);
			} else {
				transitionInfo = templateParseTransition.parseTransition(taskId, su);
			}
			if (null != transitionInfo && transitionInfo.size() > 0) {
				responseXML = templateParseTransition.parseXMLD(transitionInfo);
			} else {
				responseXML = "error:没有可选路径";
			}
			System.out.println(responseXML);
		} catch (Exception e) {
			responseXML = e.getMessage();
			e.printStackTrace();
		} finally {
			if (null != writer) {
				try {
					writer.write(responseXML);
					writer.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return null;
	}

问题是这样子的，jquery1.11.1的版本，然后如果我在java方法上打断点，就会执行success里的方法，如果不打，就只会刷新页面。很奇怪的问题。我也不知道为什么会这样，f12，也没有报错，求大神给指点指点

[孟子E章]

<button 要加type=button，默认是submit，提交页面了

[囧]

javascript没有重载 jQuery("val").val(val); => jQuery("#val").val(val);