You can go to portlet swap and download my submission, the JavaPlant MVC Portlet Framework under Framework Portlets here.
In the distribution, you will find a set of JSP components for my RSS Portlet in this directory: mvc-portlet-fwk\samples\app\src\webapp\WEB-INF\jsp\portlets\RSSFeedPortlet
Have a look at the edit.jsp - it demonstrates how you should create URL's correctly for your portlet's actions.
Maybe i've explained wrongly. I have a form in a jsp file. When i do submit, i want to have something that creates an java object. And it's this i can't do.
I'm a newbie in this world, so i can't find any simple example. Can anybody help me, give any simple example, or explaining me?
Again - try my framework - it provides this feature ;-)
You can configure your portlet to automatically create a PortletForm (an object - a form bean) and the request parameters will be used to set the properties of your form bean.
It's also reasonably well documented.