List<object[]>遍历出错

List<object[]>报错:java.lang.ClassCastException: java.util.HashMap cannot be

List<Map<String,Object>>

//{permission_parent=1, permission_name=新增新闻, permission_url=admin/index}//{permission_parent=1, permission_name=修改新闻, permission_url=admin/index}for (int i=0;i<session_object.size();i++){   Map<String,Object>  map1= session_object.get(i);   System.out.println(map1.get("permission_url"));}