Portlet URL Parameter

I’m writing a Vaadin portlet(which implements PortletApplicationContext2.PortletListener) for Liferay. I would like my portlet to read and display a parameter from the page URL.

For instance, if I navigate to:


…then I would like to set a Label in my portlet with the value of foo, so it would display “bar” in this case.

How can I do this?

Thank you

You cannot read them in a portlet - the Portlet 2.0 (JSR-286) spec does not support this. With JSR-286, portlet URLs have to be generated on the server side with a special API, and parameters set for them when the URL is created the server. The URL formats vary hugely between portals, and the parameters you set for a portlet URL might not even be encoded in the URL at all but kept on the server, or encoded in a complex way.

There are some portal specific workarounds or alternative approaches in some cases - you might e.g. want to use a
on Liferay.


Thanks for your response. I was actually able to find a different way to get this to work in Liferay, using their

public void handleRenderRequest(RenderRequest request,
			RenderResponse response, Window window) {

    HttpServletRequest httpRequest = PortalUtil.getHttpServletRequest(request);
    final String foo= PortalUtil.getOriginalServletRequest(httpRequest).getParameter("foo");

Of course, like you said, this only works for http requests, not JSR-286 requests. But if you’re passing parameters between pages instead of directly between portlets, it works well.


a very simple solution is to use a ParameterHandler.
After setting up your Liferay IPC this should work.

		ParameterHandler handler = new ParameterHandler() {

			public void handleParameters(Map<String, String[]> parameters) {
				String[] test = parameters.get("categoryId");
				if (test != null && test.length > 0) {
					window.addComponent(new Label("catID=" + test[0]

Can you be more specific? How this should work?
I’ve got LiferayIPC working and ParameterHandler still doesn’t provide any parameters (map is empty).