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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=26671 indexed properties can be only used with forms in the session scope Summary: indexed properties can be only used with forms in the session scope Product: Struts Version: 1.1 Final Platform: Other OS/Version: Other Status: NEW Severity: Normal Priority: Other Component: Controller AssignedTo: [EMAIL PROTECTED] ReportedBy: [EMAIL PROTECTED] If an action form has a indexed property defined as ArrayList elements = null and consists of instances of MyClass (that has some properties on its own) then in order for struts to fill the html property elements[x].bb with the value from the request, attribute aa should not be null. But elements will be null if 1. the form is in the request scope 2. and not initialized in the form. While initializing the form nested property can be done in some cases it can not be done with collections because the number of elements is unknown in advance. Example: PrepareListAction – creates a form MyForm instance and initializes the form’s attribute ArrayList aa with an ArrayList of objects MyClass. It then forwards the control to the ShowList.jsp which displays the elements using indexed property of the html:text tags which will result in html elements with names like elements[x].bb. The ShowList.jsp then submits the data to the SaveListAction. If the MyForm is defined in the session scope, then the collection initialized in the PrepareListAction remains in the scope and everything works fine. But if the form bean defined in the request scope, then the NullPointerException is thrown when request is parsed and an attempt is made by struts to assign the value to the element of the collection instance variable. Collection can not be just initialized in the form because the number of the elements is unknown. Note. ArrayList aa = new ArrayList() does not make any difference as it causes java array indexed exception when struts try to assign the value to the element with a given index to an empty collection. How difficult would it be to initialize the indexed properties with the right number of elements that is known from the request ? --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
