Tonio,
Sorry, here is the form that contains the JSF code:
<h:form id="chooseControlDeviceForm" style="margin: 0px; padding: 0px; width:
auto; background-color: #CCCC77;" onsubmit="submitFormViaAJAX(event, this,
'step2FillResultArea');">
STEP 1: Add a new Control Device by choosing a type from the drop-down
list:<br />
<h:selectOneMenu id="selectFromExistingTenants"
value="#{SelectNewControlDeviceTypePage.chosenDevice}">
<f:selectItems
value="#{SelectNewControlDeviceTypePage.licensedDevices}"/>
</h:selectOneMenu>
<h:commandButton id="fillButton" immediate="true" type="submit"
action="#{SelectNewControlDeviceTypePage.chooseDevice}" value="Choose"/>
<h:messages showDetail="table" layout="table"/>
</h:form>
So the method is being called via the commandButton.
-Faisal
-----Original Message-----
From: Tonio Caputo [mailto:[EMAIL PROTECTED]
Sent: Monday, June 05, 2006 2:00 PM
To: MyFaces Discussion
Subject: RE: Problem with selectOneMenuItem
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.SelectNewControlDevi
> ceTypePage
> </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
> >
>
