Why error occurs when I pass the selected value from a Jlist to a another class like: CenterOhja o = new CenterOhja(); // this is the class where i put the value from a JList. ........................... String name = (String)list.getSelectedValue(); Bean b = new Bean(); b.setName(name); b = o.getCenter(name); // this method in class CenterOhja gets object from a database with selection criteria name and. BUT, this call throws an error which I can't see from a command prompt. Help if U can    More>>