Yesterday I downloaded the new Spring 3.1RC to test the just introduced support for flash scoped variables in Spring MVC. Unfortunately I could not make it working...
I have a HTML form containing some checkboxes without spring:forms tags. Something like this:
<form action="/deleteaction" method="post">
<input type="checkbox" name="itemId" value="1" />
<input type="checkbox" name="itemId" value="2" />
<input type="submit" name="delete" value="Delete items" />
</form>
Before the Flash scope support, my annotated controller looked like:
@RequestMapping(value = "/deleteaction", method = RequestMethod.POST, params={"delete"})
public String deleteItems(@RequestParam(value="itemId", required=false) String itemId[]) {
Alternatively, I could have used an HttpServletRequest instead of @RequestParam:
@RequestMapping(value = "/deleteaction", method = RequestMethod.POST, params={"delete"})
public String deleteItems(HttpServletRequest request) {
String itemIds[] = request.getParameterValues("itemId");
Both methods were working fine. If I try to add the RedirectAttributes to the method parameters, Spring will throw an exception:
@RequestMapping(value = "/deleteaction", method = RequestMethod.POST, params={"delete"})
public String deleteItems(@RequestParam(value="itemId", required=false) String itemId[], RedirectAttributes redirectAttrs) {
Log:
Oct 16, 2011 11:20:37 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/App] threw
exception [Request processing failed; nested exception is
java.lang.IllegalArgumentException: argument type mismatch] with root cause
java.lang.IllegalArgumentException: argument type mismatch
What am I doing wrong? How is it possible to get the RedirectAttribues parameter where to add flash scoped variables?
In order to use the new RedirectAttributes, the old DefaultAnnotationHandlerMapping, AnnotationMethodHandlerAdapter and AnnotationMethodHandlerExceptionResolver must be replaced in the dispatcher-servlet.xml.
One chance is to use <mvc:annotation-driven/>, which in Spring 3.1 configures new classes RequestMappingHandlerMapping, RequestMappingHandlerAdapter, and ExceptionHandlerExceptionResolver replacing the old ones.
Otherwise, the new handler classes must be explicitly configured in dispatcher-servlet.xml.
Some extra info here: http://forum.springsource.org/showthread.php?115976-Spring-MVC-FlashMap-and-RedirectAttributes-request-mapping