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That old subject, portlet to servlet communication
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| I am attempting to figure out some way, any way to be able to pass data from a portlet to an external servlet (i.e. The servlet is not within the portlet application. The servlet _is_ being run on the same WAS (its host is "server1" as opposed to "websph
ere_portal". Lets call it eServlet).
I have tried creating a servlet that _is_ within the portlet (call it pServlet for short) to set cookies, set attributes, set parameters, set headers, set everything I can think of, but nothing seems to reach the eServlet.
I had thought that cookies would be the answer, but when I set one from the pSErvlet, eServlet cannot see it. I can actually see them being created in the cache of my browser, but eServlet doesn't see them. I've seen various methods in various forums t
hat supposedly work but I can't get them to. MY tiny little brain is just not up to the task.
Is it simply not possible to have a portlet communicate to an external servlet?
DOes someone have any concrete examples of doing this?
Thanks in advance for any help provided.
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| To make pServlet work, watch your scope when you add attributes to the session. To share the portlet session with the servlet session, you'll need to use APPLICATION_SCOPE like this:
session.setAttribute("attr1", attr1Value, PortletSession.APPLICATION_SCOPE );
Brian
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| Brian
Thanks for your reply.
yeah I'd tried that with no luck. That only seems to work when the servlet is not a part of the portlet application itself (i.e. the servlet is a part of the same war as the portlet calling it). In that case, things work famously.
However the servlet I am attempting to talk to is not a part of the portlet application at all. It is running on the app server itself. Which is to say, I created the servlet, generated the war, went to the WAS admin console Applications->Enterprise Ap
plications->Install and set it up there. I am able to hit the servlet just fine in my browser, so I know its working (it has default output when hit from the browser).
The app server running this servlet is the same one that the portal is running on (i.e. websphere_portal), but it is outside the actual /wps/portal environment.
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| whoops, typo in my previous response
this line
"That only seems to work when the servlet is not a part of the portlet application itself (i.e. the servlet is a part of the same war as the portlet calling it)"
is contradicting itself.
it should read
That only seems to work when the servlet _is_ a part of the portlet application itself (i.e. the servlet is a part of the same war as the portlet calling it)
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| If your applications are in the same domain then cookies should work. Make sure the path is set to a high level such as '/'.
I also have used regular old querystring parameters to invoke servlets from a portlet application; not sure what your requirements are.
Brian
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| I'm trying parameters and they are still not working correctly.
from a jsp within the portlet application I have the following form
[code]
<form method="GET" action="/server2/servlet2" target="_blank" >
<input class="button" style="cursor:hand" type="submit" border="0" value='Open Servlet2'/>"
<input type="hidden" name ="borkina" value="flooglethorp">
</form>
[/code]
clicking on the button opens up the new page with the following URL
http://localhost:9081/server2/servl...na=flooglethorp
within that servlet I have the following code
[code]
PrintWriter out = response.getWriter();
Enumeration aParms = request.getParameterNames();
out.println("parms:<br>");
while (aHeaders.hasMoreElements())
{
String aName = (String) aParms.nextElement();
String aValue = request.getParameter(aName);
out.println(aName + ":" + aValue + "<br>");
}
/* just to make sure*/
String borkina=request.getParameter("borkina");
if(borkina!= null)
{
out.println("borkina:" + borkina + "<br>");
}
out.println("end parms:<br>");
[/code]
which results in the following output
parms:
end parms:
I don't get why I can't see the parameter being passed in.
I swear it seems like there must be some sort of "Work Correctly" checkbox in the admin console.
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| btw, I'm not sure what is up with all the
"0" src="images/emoticons/wink.gif" alt=";)">;
that showed up in the above post. In each case what was typed in was
");
not sure why the forum changed it thus. bizarre.
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| I see you are looping through aHeaders, but shouldn't that be aParms instead? What happens if you access the servlet directly without using the form?
Brian
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| Well, once again I am proven to be a moron. Thanks for finding my painfully obvious (except to me of course) mistakes.
I promise to try harder next time.
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