Hi! I'am populating a dropdown-box and view it in a JSP page like this :    property="codesFmopp" value="reasoncode" /> In my Form the Collection are defined like this: private List codesFmopp; Getters and setters public void setCodesFmopp( List codesFmopp ) { this.codesFmopp = codesFmopp; } public List getCodesFmopp() { return codesFmopp; } When I try to select an item in the list, I get an errormessage even before struts get to the Action: java.lang.IllegalArgumentException: argument ty   More>>