Interportlet communication JSR 168

Question

I have two JSR portlets that use jsp files in their doView() methods. One portlet is menu and the other
portlet performs some action in response to selection in menu portlet.
My idea was to do the following menu.jsp for MyMenu portlet:
<%@ page import="some.package.MyMenuPortlet"%>
<%@ taglib uri="netui-tags-html.tld" prefix="netui"%>
<%@ taglib uri="http://java.sun.com/portlet" prefix="portlet"%>
<%@ taglib uri="http://www.bea.com/servers/portal/tags/netuix/render" prefix="render"%>
<p><b>Menu:</b></p>
<render:windowUrl var="windowUrl">
<render:param name="SELECTION" value="SOME_SELECTION_VALUE"/>
</render:windowUrl>
<netui:anchor href="<%=windowUrl%>"></netui:anchor><br>
This creates a one option menu with a href identical to the calling http request with addition of
SELECTION parameter at the end.
As a next step I wanted to do follwoing doView() method in secon portlet.
public void doView(RenderRequest request, RenderResponse response) throws PortletException, IOException
response.setContentType("text/html");
String menuSelectionValue = request.getParameter("SELECTION");
if (menuSelectionValue == "SOME_SELECTION_VALUE")
     /* do something regardind thin selection */
The proble is that request.getParameter("SELECTION") returns null. I think it takes parameters only from
context of portlet whom the doView() we are in.
Is there any way to retrieve parameter from http request?
Or is there any other way to compose request in a MyMenu.jsp? <portlet:renderURL> doesn´t work either.
It is visible only in MYMenuPortlet.doView() and not in MyOtherPortlet.doView(). Clearly a portlet scope
issue.
Is there any way to do this?
Another option is to use <portlet:actionURL> which would invoke MyMenuPortlet.processAction(). I could
then store selection value in user session (APPLICATION_SCOPE) and this would then be visible to my
other portlet.
Any suggestions?
Thanx

Answer 1

You have the following alternatives...
Sure, the portlet session with APPLICATION_SCOPE
Or,
you can get the HttpServletRequest from the request like the following:
request.getAttribute("javax.servlet.request");
I have two JSR portlets that use jsp files in their
doView() methods. One portlet is menu and the other
portlet performs some action in response to selection
in menu portlet.
My idea was to do the following menu.jsp for MyMenu
portlet:
<%@ page import="some.package.MyMenuPortlet"%>
<%@ taglib uri="netui-tags-html.tld"
prefix="netui"%>
<%@ taglib uri="http://java.sun.com/portlet"
prefix="portlet"%>
<%@ taglib
uri="http://www.bea.com/servers/portal/tags/netuix/ren
der" prefix="render"%>
<p><b>Menu:</b></p>
<render:windowUrl var="windowUrl">
<render:param name="SELECTION"
ION" value="SOME_SELECTION_VALUE"/>
</render:windowUrl>
<netui:anchor
href="<%=windowUrl%>"></netui:anchor><br>
This creates a one option menu with a href identical
to the calling http request with addition of
SELECTION parameter at the end.
As a next step I wanted to do follwoing doView()
method in secon portlet.
public void doView(RenderRequest request,
RenderResponse response) throws PortletException,
IOException
response.setContentType("text/html");
String menuSelectionValue =
e = request.getParameter("SELECTION");
if (menuSelectionValue == "SOME_SELECTION_VALUE")
     /* do something regardind thin selection */
The proble is that request.getParameter("SELECTION")
returns null. I think it takes parameters only from
context of portlet whom the doView() we are in.
Is there any way to retrieve parameter from http
request?
Or is there any other way to compose request in a
MyMenu.jsp? <portlet:renderURL> doesn´t work either.
It is visible only in MYMenuPortlet.doView() and not
in MyOtherPortlet.doView(). Clearly a portlet scope
issue.
Is there any way to do this?
Another option is to use <portlet:actionURL> which
would invoke MyMenuPortlet.processAction(). I could
then store selection value in user session
(APPLICATION_SCOPE) and this would then be visible to
my
other portlet.
Any suggestions?
Thanx