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Navigating through portlet pages with options - Spring MVC, WebSphere Portal, and JSR 286

Here is the scenario: We have an application running on Webphere Portal Server 6.1 and Spring MVC. There is a page with a single portlet that shows a grid full of entries. After clicking one of these entries, he should go to another portlet that is on another page, possibly even in another portlet application on the same portal server, and display this specific entry.

Here's the question: I read that using Portal 2.0 "Public Render Parameters" you can exchange data between portlets, and this should solve most of my problems. The problem is that I cannot find how this works when using Spring MVC. I cannot find a link to "Public Render Parameters" in the Spring MVC technical documentation, but some people say that they work. Can someone show me specifically where the detailed documentation is, or give me a small snippet of sample code that shows how I can access these public rendering options in my controller classes? Also, if there is a better way to achieve this in my environment, what is it and where can I find an example? Please do not reply: "If you need to do this, you must not use the portal" or "If you use XYZ technology instead, then you can do it. "I can't change the environment - this is what it is - I just need to get it working! :) Thank you!

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You can use public render options just like you use your own render options. You just need to declare them in your .xml portlet. Just keep in mind that you are not allowed to publish rendering parameters that have the same name as the "private" rendering parameters.

You need to add something like this to your .xml portlet:

<public-render-parameter>
      <identifier>myParam</identifier>
      <qname xmlns:x="http://sun.com/params">x:myParam</qname>
</public-render-parameter>

and add the following line to the portlet descriptor:

<portlet>
      . . .
     <supported-public-render-parameter>myParam</supported-public-render-parameter>
</portlet>

You can then use the usual getRenderParameter calls to "myParam" in all portlets that have this entry in the portlet descriptor.

: http://blogs.oracle.com/deepakg/entry/jsr286_public_render_parameter_feature

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