From reading through the Java file, it seems as though OEw01List is an ArrayList of OEw01_Products, which are HashMaps. The JSP seems to retrieve a similarly composed OEw01List from the database. If this is true, then you probably want to change your request.getParameter(...) to something like this:
By the way, request.getParameter(...) returns form submission values, not attributes. I don't see a reason you should be using it.