java不知名的空指针，求告知一下

有人能看一下，前端数据传递过来了，但因为某些字段没有，就默认为空值。通过dubbo远程调用服务，就会报空指针异常。

dubbo+zookeeper+ssm

代码：

handleAdd() {
                //获取表单数据
                //获取对应的id数组
                console.log(this.formData);
                console.log(this.checkitemIds);
                //向后台发送请求
                axios.post("/checkGroup/add.do?ids[]=" + this.checkitemIds,this.formData).then((res) => {
                    if (res.data.flag) {
                        //刷新页面
                        this.findPage();
                        this.dialogFormVisible = false;
                        this.$message.success(res.data.message)
                    } else {
                        this.$message.error(res.data.message)
                    }
                    //重置表单
                    this.formData = {};
                    this.checkitemIds = [];
                })
            }

controller

 @PostMapping("/add")
    public Result addCheckGroup(@RequestBody CheckGroup checkGroup, @RequestParam(value = "ids[]") Integer[] ids) {
        try {
            System.out.println(checkGroup);
            System.out.println(ids);
            checkGroupService.addCheckGroup(checkGroup, ids);
            return new Result(true, MessageConstant.ADD_CHECKGROUP_SUCCESS);
        } catch (Exception e) {
            e.printStackTrace();
            return new Result(false, MessageConstant.ADD_CHECKGROUP_FAIL);
        }
    }

异常信息

CheckGroup{id=null, code='q', name='q', helpCode='1', sex='1', remark='1', attention='1', checkItems=null}
[Ljava.lang.Integer;@1e4cdfc9
java.lang.NullPointerException
    at com.itheima.controller.CheckGroupController.addCheckGroup(CheckGroupController.java:29)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:877)

看不到行号啊，目前能看到的有可能发生空指针的也就当你checkGroupService为空时才会发生。

栈报错信息呢