IPC in Spring MVC portlets - spring-mvc

Question

I've created a Spring MVC portlets project and I'm trying to implement IPC between two of my portlets (SenderPortlet and ConsumerPortlet).
Everything works fine but I need to initialize a bean model that I put in session so I've used SessionAttributes annotation and ModelAttribute annotation on the method that initialize the bean. I have two states:
Before putting ModelAttribute annotation:
Everything works fine. I mean IPC.
After putting ModelAttribute annotation: An exception is thrown when I click on the action that fire the IPC sender event: org.springframework.web.bind.annotation.support.HandlerMethodInvocationException: Failed to invoke handler method [public void com.test.SenderController.myAction(org.springframework.web.bind.support.SessionStatus,javax.portlet.ActionResponse)]; nested exception is java.lang.IllegalStateException: Current request is not of type [javax.portlet.RenderRequest]: com.liferay.portlet.ActionRequestImpl#127e27ff
Note that myAction is the method on which the action is mapped. This methd sets the IPC event. Here is its signature:
#ActionMapping("action")
public void myAction(SessionStatus status, ActionResponse response)
{
// some code...
}
I can not understand why this exception is fired since I add the modelAttribute annotation.
Can you please help me on this ?
Many thanks.
regards,
EDIT 1 More code
ConsumerPortlet.java
#Controller(value = "ConsumerPortlet")
#SessionAttributes( value="products" )
#RequestMapping("VIEW")
public class ConsumerPortlet {
#RequestMapping
public String handleRenderRequest(RenderRequest request, RenderResponse response, Model model) {
try {
//some code
return "page";
}
#ModelAttribute("products")
public List<ProductBean> initilizeProduct(RenderRequest renderRequest){
//some code
return productList;
}
#EventMapping(value ="{http://liferay.com/events}myEvent")
public void processEvent(EventRequest request, EventResponse response) throws PortletException, IOException {
javax.portlet.Event event = request.getEvent();
String testValue = (String) event.getValue();
System.out.println("IPC test value: "+testValue);
}
SenderPortlet.java
#Controller(value = "SenderPortlet")
#SessionAttributes( value="products" )
#RequestMapping("VIEW")
public class SenderPortlet {
#RequestMapping
public String handleRenderRequest(RenderRequest request,
RenderResponse response, Model model) {
return "page2";
}
#ModelAttribute("products")
public List<ProductBean> initilizeProduct(RenderRequest renderRequest){
PortletSession ps = renderRequest.getPortletSession();
List<ProductBean> productList = (List<ProductBean>) ps.getAttribute("products",PortletSession.APPLICATION_SCOPE);
return productList;
}
#ActionMapping("myAction")
public void myAction(SessionStatus status,
ActionResponse response)
{
QName qname = new QName("http://liferay.com/events", "myEvent", "x");
response.setEvent(qname, "test-value sent");
status.setComplete();
}
portlet.xml
<portlet>
<portlet-name>sender</portlet-name>
<portlet-class>
org.springframework.web.portlet.DispatcherPortlet
</portlet-class>
<init-param>
<name>contextConfigLocation</name>
<value>/WEB-INF/sender-portlet.xml</value>
</init-param>
<supports>
<mime-type>text/html</mime-type>
<portlet-mode>view</portlet-mode>
</supports>
<portlet-info>
<title>Sender</title>
</portlet-info>
<supported-publishing-event>
<qname xmlns:x="http://liferay.com/events">x:myEvent</qname>
</supported-publishing-event>
</portlet>
<portlet>
<portlet-name>consumer</portlet-name>
<portlet-class>
org.springframework.web.portlet.DispatcherPortlet
</portlet-class>
<init-param>
<name>contextConfigLocation</name>
<value>/WEB-INF/consumer-portlet.xml</value>
</init-param>
<supports>
<mime-type>text/html</mime-type>
<portlet-mode>view</portlet-mode>
</supports>
<portlet-info>
<title>Consumer</title>
</portlet-info>
<supported-processing-event>
<qname xmlns:x="http://liferay.com/events">x:myEvent</qname>
</supported-processing-event>
</portlet>
<event-definition>
<qname xmlns:x="http://liferay.com/events">x:myEvent</qname>
<value-type>java.lang.String</value-type>
</event-definition>
liferay-portlet.xml
<portlet>
<portlet-name>sender</portlet-name>
<icon>/icon.png</icon>
<instanceable>true</instanceable>
<header-portlet-css>/css/test.css</header-portlet-css>
<footer-portlet-javascript>/js/test.js</footer-portlet-javascript>
</portlet>
<portlet>
<portlet-name>consumer</portlet-name>
<icon>/icon.png</icon>
<instanceable>true</instanceable>
<header-portlet-css>/css/test.css</header-portlet-css>
<footer-portlet-javascript>/js/test.js</footer-portlet-javascript>
</portlet>
Liferay 6.2.10.12
Spring 3.0.7.RELEASE

Answer 1

As the method expecting the RenderRequest instead of ActionRequest, it is throwing that error. The below code might solve the problem or you can use generic Reuqest/Response i.e PortletRequest and PortletResponse
public void myAction(#ModelAttribute("products") List<ProductBean> productList, SessionStatus status,
ActionResponse response)
{
QName qname = new QName("http://liferay.com/events", "myEvent", "x");
response.setEvent(qname, "test-value sent");
status.setComplete();
}