form表单提交后报错,具体内容进来看.

Question

form提交报错
严重: Servlet.service() for servlet jsp threw exception
tag 'select', field 'list', name 'personcost.pid': The requested list key 'polist' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]
严重: Servlet.service() for servlet default threw exception
java.lang.IllegalStateException
我的form表单


哪里错了?为什么错?怎么办?

Answer 1

你看错误信息就知道：
The requested list key 'polist' could not be resolved as a collection/array/map/enumeration/iterator

list属性定义的变量在Action中必须是一个可以迭代的对象如 数组，列表，Map等。
你在你的Action中看看这个polist是怎么定义的。
是没有定义getter和setter还是 你把它的类型定义错了。