嵌套列表中的属性发布在 spring mvc 中似乎不起作用

Question

I have an Object with a main list in it and a sub list in that main list. Showing the properties in a form is no problem.
But when I post the form and one or more of the properties of the sub list are inputs (hidden or not) I get the following:

InvalidPropertyException: Invalid property 'groups[0].members[0]' of bean class [xxx.MyModelObject]: Index of out of bounds in property path 'members[0]'; nested exception is java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

I use a Freemarker (2.3.22) view. The generated html of one sub list property is:

<input type="hidden" id="groups0.members0.surName" name="groups[0].members[0].surName" value="dummyName">

Seems Ok to me. There is no problem with simple properties in the main list, like id groups0.groupName / name groups[0].groupName.
(spring version 4.1.3).

Answer 1

检查组和成员类的 getter 和 setter