I would recommend keeping all the EJBs in the same layer, but adding new portlets.<br /><br />Check out the Recent Documents portlet. That&#39;s a view of the Document Library portlet with stuff missing.<br /><br />A good way would be to create a new portlet, with x functionality, duplicate it in the shopping portlet. Then remove it from the shopping portlet. It&#39;s really quite a task. I would question the usefulness of it though. Since we have many portlets besides shopping, it&#39;d be bad if the user picked one portlet but wasn&#39;t able to add to cart because their cart portlet wasn&#39;t added. It&#39;s easier and more useful to just bundle it all in.<br /><br />Now, a very useful refactoring, imho, is to be able to make it hit a CC like CyberSource. <!--emo&;)--><img src='@theme_images_path@/emotions/wink.gif' border='0' style='vertical-align:middle' alt='wink.gif' /><!--endemo--> and having it go from http to https and back. Others have submitted code like it already, we just haven&#39;t had time to include it all in.

Thank you for your advice. <!--emo&^_^--><img src='@theme_images_path@/emotions/happy.gif' border='0' style='vertical-align:middle' alt='happy.gif' /><!--endemo--> I&#39;d thought the problem you said over. My original refactoring idea is spitting the shopping portlet into several windows(some can be put in the left or right narrow column, some can be put in the middle column), and all the windows belong to a single portlet so that they can be managed easily. But I&#39;m wondering how to implement this, I think a portlet&#39;s window can be set in only one column though it can has several rows.

You may want to check out how tiles is being used in portal-web/docroot/html/tiles/portlet_default.jsp. Then see how in portal-web/docroot/web-inf/tiles-defs.xml many portlets are extending the portlet_default definition? perhaps this is along the lines of what you&#39;re looking for?<br /><br />We&#39;d also be interested to hear what your paper is about exactly, and even read it over when you are done.