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PO@ModelAttribute method isn't called again in a Portlet Spring MVC
 

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  1. PO@ModelAttribute method isn't called again in a Portlet Spring MVC
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    <p>My question boils down to: How you do get spring mvc to call <code>@ModelAttribute</code> after it has already been populated?</p> <p>To elaborate, I'm messing around with the BookCatalog example from chapter 8 from <em>Portlets in Action</em> by Ashish Sarin (Which is really good) and I've run into a problem where the method annotated with <code>@ModelAttribute</code> is only called once even upon successive loads. For instance:</p> <ol> <li>BookCatalog Portlet is displayed</li> <li>Click Edit Book1. Book1 is displayed in the edit form</li> <li>Click home</li> <li>Click Edit Book2. Book1 is <em>still</em> displayed in the edit form</li> </ol> <p>I've added sysouts to the begining of each method to see what is being called where. The results are as follows:</p> <pre><code>showBooks getBook! initBinder showEditBookForm showBooks initBinder &lt;- Where is getBook!? showEditBookForm </code></pre> <p>I read somewhere that <code>@ModelAttribute</code> methods are called whenever <code>@ModelAttribute</code> parameters are requested. So I tried adding <code>@ModelAttribute("book") Book book</code> to the showEditBookForm but that still doesn't seem to trigger the <code>@ModelAttribute</code> method.</p> <p>I'm using Spring 3.1.3.RELEASE and deploying with maven to Liferay 6.1.1.</p> <p>Any assistance would be appreciated!</p> <p>EditBookController:</p> <pre><code>@Controller @RequestMapping(value="VIEW") @SessionAttributes({"book"}) public class EditBookController { ... @RenderMapping(params="myaction=editBookForm") public String showEditBookForm(@ModelAttribute("book") Book book) { System.out.println("showEditBookForm"); return "editBookForm" } @InitBinder("book") public void initBinder(WebDataBinder binder) { System.out.println("initBinder"); binder.registerCustomEditor(Long.class, new LongNumberPropertyEditor()); binder.setDisallowedFields(new String[] {"isbnNumber"}); } @ModelAttribute("book") public Book getBook(@RequestParam Long isbnNumber) { System.out.println("getBook!"); return bookService.getBook(isbnNumber); } ... } </code></pre> <p>BookController:</p> <pre><code>@Controller @RequestMapping(value = "VIEW") public class BookController { ... @RenderMapping public String showBooks(RenderResponse response,SessionStatus sessionStatus) { System.out.println("showBooks"); return "home"; } ... } </code></pre>
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