IllegalStateException_java.lang.illegalstateexception: optional long par

IllegalStateException

java.lang.IllegalStateException: Optional long parameter 'id' is present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type.
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1 angularJS

controller代码

// 根据id查询列表
this.findByParentId=function(parentId){
    return $http.get('../itemCat/findByParentId.do?parentId='+parentId);
} 
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service代码

    //搜索
$scope.findByParentId=function(parentId){  
    alert(parentId);
    itemCatService.findByParentId(parentId).success(
        function(response){
            $scope.list=response;
        }           
    );
}
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2 web

service代码

//根据id查询列表数据
public List<TbItemCat> findByParentId(Long id);
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serviceImpl代码

@Override
    public List<TbItemCat> findByParentId(Long id) {
        System.out.println(id);
        TbItemCatExample example = new TbItemCatExample();
        Criteria criteria = example.createCriteria();
        criteria.andParentIdEqualTo(id);
        return itemCatMapper.selectByExample(example);       
    }   
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controller代码

// 根据id查询列表
@RequestMapping("/findByParentId")
public List<TbItemCat> findByParentId(long id) {
    System.out.println(parentId);
    return itemCatService.findByParentId(parentId);
}
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检查发现后端controller参数是long,改成包装类Long,发生如下报警

java.lang.RuntimeException: Value for parentId cannot be null
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将id输出运行,输出为null,检查参数,发现参数名错误……..与get请求提交不一致