[jboss-user] [JBoss Seam] - Help with application scope bean

[lle]

Hi,

I am a newbie with Seam and am trying to convert my JSF application to use Seam without ejb3.

I have an application scoped action object, which initialized a map of javabeans from the database, as below:


  | @Name("appManager")
  | @Scope(ScopeType.APPLICATION)
  | @Startup
  | public class GAHostAppManagedAction {
  | 	
  | 	@In
  | 	private Session session;
  | 	
  | 	@Logger
  | 	private Log log; 
  | 	
  | 	private Map<String, List<Items>> hostAppsByHostName;
  | 	
  | 	public List<SelectItem> getHostList() {
  |                    ... this instantiate and initialized a list SelectItem, containing String of host
  |                 }
  | 
  |                 @Create
  |                 public void init() {
  |                   ... get a list of Items and populate it to the map
  |                 }
  | }

Here is my home.xhtml code snippet:

  | <h:form>
  | <h3>Please enter your name and password:</h3>
  | <h:panelGrid columns="2">
  | Name: <h:inputText value="#{user.userName}"/>
  | Password: <h:inputSecret value="#{user.userPassword}"/>
  | Host: 
  | <h:selectOneMenu value="#{hostapp.host}">	
  | <a4j:support action="#{hostapp.hostChanged}" event="onchange" reRender="applist" limitToList="true" ajaxSingle="true" requestDelay="20"/>
  | <f:selectItems value="#{appManager.hostList}"/>
  | </h:selectOneMenu>
  | Application
  | <h:selectOneMenu id="applist" value="#{hostapp.id}">
  | <f:selectItems value="#{appManager.appList}"/>
  | </h:selectOneMenu>
  | </h:panelGrid>
  | <br/>
  | <h:commandButton action="#{login.login}" value="Login"/>
  | </h:form>
  | 
It doesn't seem to work.  I got the following exception when hitting the page home.jsf:
java.lang.IllegalArgumentException: Value binding '#{appManager.hostList}'of UISelectItems with component-path {Component-Path : [Class: org.ajax4jsf.framework.ajax.AjaxViewRoot,ViewId: /home.xhtml][Class: javax.faces.component.html.HtmlForm,Id: _id2][Class: javax.faces.component.html.HtmlPanelGrid,Id: _id4][Class: javax.faces.component.html.HtmlSelectOneMenu,Id: _id10][Class: javax.faces.component.UISelectItems,Id: _id12]} does not reference an Object of type SelectItem, SelectItem[], Collection or Map but of type : null
  | 	at org.apache.myfaces.shared_impl.util.SelectItemsIterator.hasNext(SelectItemsIterator.java:144)
  | 	at org.apache.myfaces.shared_impl.renderkit.RendererUtils.internalGetSelectItemList(RendererUtils.java:414)
  | 	at org.apache.myfaces.shared_impl.renderkit.RendererUtils.getSelectItemList(RendererUtils.java:392)
  | 

Can any of you let me know what I did wrong?
Sorry, I am still trying to get familiar with Seam concepts and might have missed something.
Thanks a lot.

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