Faisal,
When are you calling chooseDevice() method ?
I mean, during the processing of which JSF event are you
calling chooseDevice().
Regards
On Mon, 2006-06-05 at 13:40 -0700, Faisal Mahmoud wrote:
> Hi Tonio,
>
> My backing bean is in the session, and the way I populate the List is via in
> the
> getter method for the property. The full class code is below. Note I use the
> Spring framework, so alot of my dependencies are wired using Spring. For the
> life of me, I cannot figure out why the selection does not get bound to the
> property. Also, beneath the java code is my faces-config.xml entry for this
> class.
> public class SelectNewControlDeviceTypePage
> {
> /**
> * Default no-args constructor
> */
> public SelectNewControlDeviceTypePage() {}
>
> // BUSINESS LOGIC
> public String chooseDevice()
> {
> logger.info("Received a request from the JSF View to forward to
> the view associated with the chosen licensed controller.");
> if (this.getChosenDevice() == null)
> {
> logger.debug("#####################chosenDevice is
> null");
> }
>
> if (this.getChosenDevice().equals(this.ILON100))
> {
> logger.info("Forwarding to view associated with Licensed
> Controller: " + this.ILON100);
> return this.CHOOSEILON100;
> }
> else if (this.getChosenDevice().equals(this.CARRIERDDE))
> {
> logger.info("Forwarding to view associated with Licensed
> Controller: " + this.CARRIERDDE);
> return this.CHOOSECARRIERDDE;
> }
> else if (this.getChosenDevice().equals(this.HONEYWELL))
> {
> logger.info("Forwarding to view associated with Licensed
> Controller: " + this.HONEYWELL);
> return this.CHOOSEHONEYWELL;
> }
> else
> {
> logger.info("Forwarding to error view, unknown Licensed
> Controller chosen: " + this.getChosenDevice());
> return this.ERROR;
> }
> }
>
> // PROPERTY: controlDeviceEditDelegate
> public ControlDeviceEditDelegate getControlDeviceEditDelegate() { return
> this.controlDeviceEditDelegate; }
> public void setControlDeviceEditDelegate(ControlDeviceEditDelegate
> controlDeviceDelegate) { this.controlDeviceEditDelegate =
> controlDeviceDelegate;
> }
>
>
> // PROPERTY: chosenDevice
> public String getChosenDevice() { return this.chosenDevice; }
> public void setChosenDevice(String chosenDevice) { this.chosenDevice =
> chosenDevice; }
>
> // PROPERTY: licensedDevices
> public List getLicensedDevices()
> {
> if (this.licensedDevices == null)
> {
> logger.debug("List of licensedDevices is NULL,
> retrieving via delegate.");
> try
> {
> this.licensedDevices =
> this.controlDeviceEditDelegate.getLicensedControllerList();
> }
> catch (BaseViewException e)
> {
> logger.error(e);
> this.licensedDevices = new LinkedList();
> }
> catch (Exception e)
> {
> logger.error(e);
> this.licensedDevices = new LinkedList();
> }
> catch (Throwable e)
> {
> logger.error(e);
> this.licensedDevices = new LinkedList();
> }
> logger.debug("Received a List of licensedDevice
> SelectItem objects from delegate, list size = " +
> this.licensedDevices.size());
> }
> return this.licensedDevices;
> }
> public void setLicensedDevices(List licensedDevices) {
> this.licensedDevices = licensedDevices; }
>
> // Navigation strings
> private final String ERROR = "error";
> private final String CHOOSEILON100 = "chooseILON100";
> private final String CHOOSEHONEYWELL = "chooseHoneywell";
> private final String CHOOSECARRIERDDE = "chooseCarrierDDE";
>
> // Device description strings
> private final String ILON100 = "Echelon iLON100";
> private final String HONEYWELL = "Honeywell";
> private final String CARRIERDDE = "Carrier DDE";
>
> // Associations
> private ControlDeviceEditDelegate controlDeviceEditDelegate;
>
> // View Properties
> private List licensedDevices;
> private String chosenDevice = "";
>
> // Private constant member variables
> private final Log logger = LogFactory.getLog(this.getClass());
> }
>
> <managed-bean>
>
> <managed-bean-name>SelectNewControlDeviceTypePage</managed-bean-name>
>
> <managed-bean-class>com.dv.ocs.jsf.bean.view.page.SelectNewControlDeviceTypePage
> </managed-bean-class>
> <managed-bean-scope>session</managed-bean-scope>
> <managed-property>
> <property-name>controlDeviceEditDelegate</property-name>
> <value>#{controlDeviceEditDelegate}</value>
> </managed-property>
> </managed-bean>
>
> -faisal
>
>
> -----Original Message-----
> From: Tonio Caputo [mailto:[EMAIL PROTECTED]
> Sent: Monday, June 05, 2006 12:18 PM
> To: MyFaces Discussion
> Subject: Re: Problem with selectOneMenuItem
>
> Hi Faisal,
>
> I had the same problem, it was because my Backing Bean has request scope,
> and
> my list was not initialized in the constructor method.
>
> The problem was, that as the Backing Bean did not have the list initialized
> the "value" of the component was not set.
>
> An easy way to detect this problem is to be sure that your JSP page has
> somewhere the tag h:messages.
>
> <h:messages showDetail="table" layout="table"/>
>
> Hope this helps
> tonio
>
>
> On Mon, 2006-06-05 at 11:48 -0700, Faisal Mahmoud wrote:
> > Hi All,
> >
> > I am building a drop down list using the <h:selectOneMenu> tag and all
> > the items in the List populate and show up correctly in the drop down
> > list. But after the user selects an item in the list and submits the
> > form, when I check the property that is specified in the tag's value
> > attribute, I get a NullPointerException. My code is below:
> >
> >
> > jsp page:
> > <h:selectOneMenu id="selectFromExistingTenants" immediate="true"
> > value="#{SelectNewControlDeviceTypePage.chosenDevice}">
> > <f:selectItems
> > value="#{SelectNewControlDeviceTypePage.licensedDevices}"/>
> > </h:selectOneMenu>
> >
> > Code that builds the java.util.List of javax.faces.model.SelectItem
> > objects in the <f:selectItems> value attribute:
> > List list = this.licensedControllerDAO.getAllLicensedControllers();
> > logger.debug("Retrieved List of LicensedController objects. List size
> > = " + list.size()); Iterator iter = list.iterator(); while
> > (iter.hasNext()) {
> > LicensedController licensedController = (LicensedController)
> > iter.next();
> > String controllerLabel = licensedController.getLabel();
> > SelectItem selectItem = new SelectItem(controllerLabel,
> > controllerLabel);
> > licensedDevices.add(selectItem);
> > logger.debug("Added a SelectItem to the List with controllerLabel
> > = " + controllerLabel); }
> >
> >
> > Backing Bean code for the <h:selectOneMenu> tag's value attribute:
> > //SelectNewControlDeviceTypePage.java
> > private String chosenDevice;
> > // PROPERTY: chosenDevice
> > public String getChosenDevice() { return this.chosenDevice; } public
> > void setChosenDevice(String chosenDevice) { this.chosenDevice =
> > chosenDevice; }
> >
> >
> > So what am I doing wrong in my code such that my backing bean property
> > is not getting with the chosen item?
> >
> > Faisal Mahmoud
> > www.quidprocode.com
> >
>
