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POSpring form submit can not bind to subclass
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copied!<p>I'm developing web application with spring. I have two bean classes. This is the super class.</p> <pre><code>public class SuperClass{ protected String name; public SuperClass(){ } public SuperClass(String name){ this.name = name; } // here the getter and the setter } </code></pre> <p>This is the subclass</p> <pre><code>public class SubClass extends SuperClass{ protected String address; public SubClass(){ } public SubClass(String name, String address){ super(name); this.address = address; } // here the getters and the setters } </code></pre> <p>Here is my controller class.</p> <pre><code>@Controller @RequestMapping("/editSub") public class EditController { @RequestMapping(method = RequestMethod.GET) public String showEdit(ModelMap model){ model.addAttribute("sub", new SubClass("some name", "some address")); return "edit"; } @RequestMapping(method = RequestMethod.POST) public String edited(@ModelAttribute("sub") SubClass sub, ModelMap model) { //do somthing here model.addAttribute("sub", sub); return "somepage"; } } </code></pre> <p>and in my edit.jsp,</p> <pre><code><form:form method="POST" modelAttribute="sub" action="editSub"> <form:input path="name"/> <form:input path="address"/> <input type="submit" value="Edit"/> </form:form> </code></pre> <p>Here is my problem. When I try this, it gives me 400 error. But when I change the "edited" method in controller class as below, it works fine.</p> <pre><code>@RequestMapping(method = RequestMethod.POST) public String edited(@ModelAttribute("sub") SuperClass sub, ModelMap model) { //do somthing here model.addAttribute("sub", sub); return "somepage"; } </code></pre> <p>But as obvious, then there is no any address field in the object. So it only works with the super class and gives me 400 error when I bind the form to a subclass. I can't understand why? Also the object "sub" can not be casted into SubClass inside "edited" method.</p> <p>Please help me through. I searched about this and nothing useful found. I have read this thread also. <a href="http://forum.springsource.org/showthread.php?94650-Problem-binding-subclasses" rel="nofollow">http://forum.springsource.org/showthread.php?94650-Problem-binding-subclasses</a>. But it doesn't solve my problem.</p>

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