表单提交后报406错误

@RequestMapping(value = "acct/save", method = RequestMethod.POST, produces = "text/plain;charset=UTF-8")
public @ResponseBody
String saveAcctount(MemberInfo member, @RequestParam(value = "roleId", required = false) String roleId) {
	if (StringUtils.isEmpty(member.getMemberId())) {
		try {
			memberInfoManager.saveMemberInfo(member, roleId);
			return "新增成功";
		} catch (Exception e) {
			return "新增失败:" + e.getMessage();
		}
	} else {
		try {				
			memberInfoManager.updateMemberInfo(member, roleId);
			return "修改成功";
		} catch (Exception e) {
			return "修改失败:" + e.getMessage();
		}
	}
}

function saveAcct(){
	$('#acctForm').form('submit', {
	    url:acct_save_url + '?roleId=' + $('#acctRole').val(),
	    onSubmit:function(){
	        //$(this).form('validate');
	    },
	    success:function(data){
	    	$.messager.alert('提交结果',data, 'info',function(){
	    		acctLoad();
	     		$('#acctWin').window('close');
	     		$('#acctForm').form('clear');
	     		$('#memberId').remove();
	        	$('#memberName').removeAttr('readonly');
	        	$('#realName').removeAttr('readonly');
	        });
	    }
	});
}