Trouble with @DataModelSelection

[henrik.lindberg]

I am having trouble with using @DataModelSelection - I end up with an empty object when something is selected.

I am using seam 1.2GA, and Ajax4JSF + Rich Faces.

(Will post code as I am stuck)

Greatful for any help or suggestions...

[henrik.lindberg]

Here is the action bean:

@Stateful
@Scope(SESSION)
@Name("userSpaces")
@TransactionAttribute(REQUIRED)
@Restrict("#{s:hasRole('user')}") // Forces check that user is logged in
public class UserSpacesAction implements UserSpacesLocal, Serializable
{

 private static final long serialVersionUID = -3722438832731142648L;

 @PersistenceContext
 private EntityManager em;

 @In("currentUser")
 private User m_currentUser;

 private String m_spaceInput;

 @SuppressWarnings("unused")
 @DataModel("availableSpaces")
 private List<PublishingSpace> m_availableSpaces;

 @SuppressWarnings("unused")
 @DataModelSelection
 @Out(required = false)
 private PublishingSpace selectedSpace;


 private String m_first;
 private static int PAGESIZE = 10;

 @Logger
 private Log log;

 @SuppressWarnings("unchecked")
 @Factory("availableSpaces")
 public void getAvailableSpaces()
 {
 log.debug("Get User space for user #0", m_currentUser.getLogin());

 m_availableSpaces = em.createQuery(
 "SELECT DISTINCT s.publishingSpace FROM SpaceAccess s WHERE s.theUser = :user").setParameter("user",
 m_currentUser).getResultList();

 log.debug("Got a List back empty=#0", Boolean.valueOf(m_availableSpaces.isEmpty()));
 }
 public PublishingSpace getSelectedSpace()
 {
 return selectedSpace;
 }
 public void setSelectedSpace(PublishingSpace space)
 {
 selectedSpace = space;
 }
 public String addSpace()
 {
 // create the full "public.xxx" name and check that it is a
 // valid space name
 //
 String tmpSpace = "public."+m_spaceInput;
 if(!SpaceNameValidator.isSpaceNameValid(tmpSpace))
 {
 FacesMessages.instance().add("spaceInput", "Invalid space name");
 return null;
 }
 // Check if space exists
 //
 if(PublishingSpace.exists(em, tmpSpace))
 {
 FacesMessages.instance().add("spaceInput", "Space name already taken - use something else.");
 return null;
 }

 // Add objects
 //
 log.debug("Adding space for public.#0", m_spaceInput);
 PublishingSpace p = new PublishingSpace("public."+m_spaceInput);
 p.setDateAdded(new Date());
 SpaceAccess sa = new SpaceAccess(m_currentUser,p, Boolean.TRUE);
 em.persist(p);
 em.persist(sa);
 log.info("Added space #0 for user #1", p.getSpaceName(), m_currentUser.getLogin());
 getAvailableSpaces();
 lastPage();
 // Clear this value for new input
 m_spaceInput = "";
 return null;
 }

 public void setSpaceInput(String space)
 {
 m_spaceInput = space;
 }

 public String getSpaceInput()
 {
 return m_spaceInput;
 }
 public void select(PublishingSpace space)
 {
 selectedSpace = space;
 log.info("selectedSpace=", space == null ? "null" : space.getSpaceName());
 }
 public String nextPage()
 {
 System.err.print("NEXT PAGE first="+m_first);
 if(m_availableSpaces != null)
 {
 int tmp = getIntFirst() + PAGESIZE;

 if(tmp <= m_availableSpaces.size())
 setIntFirst(tmp);
 }
 return null;
 }
 public String prevPage()
 {
 setIntFirst(Math.max(0, getIntFirst() - PAGESIZE));
 return null;
 }
 public String firstPage()
 {
 setIntFirst(0);
 return null;
 }
 public String lastPage()
 {
 if(m_availableSpaces != null)
 {
 int lastIdx = m_availableSpaces.size() -1;
 if(lastIdx >= 0)
 {
 int tmp = lastIdx / PAGESIZE;
 setIntFirst(tmp * PAGESIZE);
 }
 }
 return null;
 }
 public String getFirst()
 {
 return m_first == null ? "0" : m_first;
 }
 public void setFirst(String first)
 {
 m_first = first;
 }
 private void setIntFirst(int first)
 {
 m_first = String.valueOf(first);
 }
 private int getIntFirst()
 {
 return (m_first == null ? 0 :
 Integer.parseInt(m_first));
 }
 public int getPageSize()
 {
 return PAGESIZE;
 }
 @Destroy
 @Remove
 public void destroy()
 {
 System.out.print("USERSPACES-ACTION - destroyed");
 }
}

I experimented with some getters and setters of the data selection - but it did not make a difference - does not work either way.

Also, it does not matter if I use the "addSpace" method to add new things - if I just render objects already in the database I have the same problem.
The pagination code is there to support a view that is not converted to use a datascrooller/paginator.

In this version of the select method I try to pass the selected thing as a parameter from the facelet. My previous attempt did not use that - it produced the same result.

Will now post the remaining parts.

[henrik.lindberg]

Here is the local interface (sans imports and headers):

@Local
public interface UserSpacesLocal
{
 public void destroy();

 public void getAvailableSpaces();

 public String getSpaceInput();
 public void setSpaceInput(String space);
 public String addSpace();
 public String nextPage();
 public String prevPage();
 public String firstPage();
 public String lastPage();
 public int getPageSize();
 public String getFirst();
 public void setFirst(String first);
 public void select(PublishingSpace selectedSpace);
 public void setSelectedSpace(PublishingSpace space);
 public PublishingSpace getSelectedSpace();
}

[henrik.lindberg]

And here is the xhtml:

<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
 xmlns:s="http://jboss.com/products/seam/taglib"
 xmlns:ui="http://java.sun.com/jsf/facelets"
 xmlns:f="http://java.sun.com/jsf/core"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:a4j="https://ajax4jsf.dev.java.net/ajax"
 xmlns:rich="http://richfaces.ajax4jsf.org/rich"
 template="layout/template.xhtml">

 <ui:define name="title">Spaces page</ui:define>
 <ui:define name="body">
 <div id="wrap-cspaces">
 <img id="spacesHeading" src="/img/spaces.heading.png" />
 <a href="FAQ-spaces.seam"><img class="infoButton" id="spacesInfo"
 src="/img/info.button.png" /></a>
 </div>
 <div class="Divider2" id="cspaces-topDivider"/>

 <f:view>
 <!-- ADDING NEW SPACE -->
 <div id="addSpaceBox"><h:form id="addSpaceForm">
 <s:validateAll>
 <h:outputLabel for="spaceInput">Wanted Public Space Name:</h:outputLabel>
 <h:inputText
 styleClass="InputField"
 id="spaceInput"
 value="#{userSpaces.spaceInput}"
 required="true"
 maxlength="93" />
 <h:commandButton type="submit" value="Add Space"
 action="#{userSpaces.addSpace}"
 image="/img/create.new.space.grey.btn.png" />
 <h:message for="spaceInput" />
 <h:messages globalOnly="true" />
 </s:validateAll>
 </h:form></div>
 <div class="Divider2" id="cspaces-bottomDivider"/>

 <h:outputText
 rendered="#{availableSpaces == null or not (availableSpaces.rowCount > 0)}"
 styleClass="warn"
 value="There are no spaces to display. Add wanted space(s) using the box above." />
 <h:form id="spaceForm">
 <h:dataTable
 id="space_list"
 styleClass="fence"
 value="#{availableSpaces}"
 var="p"
 rendered="#{availableSpaces != null and availableSpaces.rowCount > 0}"
 rowClasses="first,second"
 columnClasses="col1class,col2class"
 first="#{userSpaces.first}"
 rows="#{userSpaces.pageSize}">
 <h:column>
 <f:facet name="header">name</f:facet>
 <s:link value="#{p.spaceName}" action="#{userSpaces.select(p)}" />
 </h:column>
 <h:column>
 <f:facet name="header">created</f:facet>
 <h:outputText value="#{p.dateAdded}" />
 </h:column>
 </h:dataTable>
 <rich:datascroller
 for="space_list"
 rendered="#{availableSpaces != null and availableSpaces.rowCount > 0}"
 maxPages="9"
 id="paginator"
 renderIfSinglePage="false"
 />
 </h:form>

 </f:view>
 </ui:define>
</ui:composition>

[henrik.lindberg]

Happy now!

A manual clean up of deployment folders, rebuilding from scratch and restarting JBoss cured the problem.

(And in case you have not spotted it - in the code above - the call to log in the select() method does not output anything because of a missing #0 in the template string - but that was also where I had my breakpoint - thought it worth mentioning...