最近项目中页面比较复杂,springMVC传参过程中遇到这样一个错误:Could not instantiate bean class [java.util.List]: Specified class is an interface] with root cause 经研究发现这是参数封装出了问题. 还原代码: @RequestMapping("/test") public ModelAndView test(List<OptionVo> ov){ ModelAndVie…
需求,要求批量新增或者改动一个List,在Spring MVC中是不支持以下代码的写法 @RequestMapping(value = "/update", method = RequestMethod.POST) public String update(List<ProductCollocation> productCollocations ,HttpServletRequest request, RedirectAttributes redirectAttribute…
需求,要求批量新增或者修改一个List,在springMVC中是不支持下面代码的写法: @RequestMapping(value = "/update", method = RequestMethod.POST) public String update(List<ProductCollocation> productCollocations ,HttpServletRequest request, RedirectAttributes redirectAttribute…
错误:org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [java.util.List]: Specified class 这是我使用Spring MVC的时候出的错误,在前台将多个信息的id封装成一个集合后传递到控制层,向让这些id自动映射到控制层方法的参数上 我这个参数是一个List类型,因为Spring MVC是不能这样直接映射到集合类型的参数的,我们需要将这个集合类…
错误信息提示: Failed to instantiate [java.util.List]: Specified class is an interface; 错误信息意思:参数错误,参数封装出了问题. 原因: 前端给后台传递了一个list对象,本来以为直接用list 可以接收,但是运行方法报错,参数错误.查询错误问题,发现是前端传递的对象,后台没有set,get的实体接收. controller中参数List内封装的不是基本数据类型,而是一个对象,springMVC源码获取前台的参数是:re…
后台spring mvc接收List参数报错如下:org.springframework.beans.BeanInstantiationException: Failed to instantiate [java.util.List]: Specified class is an interface org.springframework.beans.BeanInstantiationException: Failed to instantiate [java.util.List]: Speci…
并发框架分类 1. Executor相关类 Interfaces. Executor is a simple standardized interface for defining custom thread-like subsystems, including thread pools, asynchronous I/O, and lightweight task frameworks. Depending on which concrete Executor class is being u…
摘自: www.uml-diagrams.org Here we provide several UML class diagrams for the Java™ 7 java.util.concurrent package. Several java.util.concurrent.* packages introduced with version 5.0 of the Java platform added high-level concurrency features to the Ja…
java.util.LinkedHashMap cannot be cast to com.entity.Person 使用mybatis, resultMap映射的是实体类Person, 查询出来的结果是一个ArrayList<Person>,然后结果存放在一个ListObject的data属性中, 存放结果的类 public class ListObject { private Object data; public Object getData() { return data; } pu…
java.util.LinkedHashMap cannot be cast to com.zq.dataservice.bean.Index 上述错误是在做一个趋势投资demo时遇到的. 说的是链式HashMap不能转换为单个对象进行foreach 其解决: private List<IndexData> map2IndexData(List<Map> temp) { List<IndexData> indexDatas = new ArrayList<>…