show me the right way to access row of datatable with Seam F

[tim_ph]

I've been trying and trying but cannot do a simple thing like this:

 <h:dataTable var="personnel" value="#{applicationHome.personnels}">
 <h:column>
 <f:facet name="header">action</f:facet>
 <s:link value="Select" action="#{applicationHome.selectPersonnel}"/>
 </h:column>
</h:dataTable>

where applicationHome is generated by Seam-gen and modified a bit

@Name("applicationHome")
public class ApplicationHome extends EntityHome<Application>
{
...
 @DataModel
 private List<Personnel> personnels;
 public List<Personnel> getPersonnels()
 {
 if (personnels == null)
 personnels = getInstance() == null ? null : new ArrayList<Personnel>(getInstance().getPersonnels());
 return personnels;
 }
 @DataModelSelection
 @Out(required = false)
 private Personnel personnel;
 @Logger Log log;
 public void selectPersonnel()
 {
 if (personnel == null) log.info("always null here");
 }
}

I appreciate any help on using new Seam Framework (we want to use seam-gen for business reason).
Thanks

- can't use factory with more likely name conflict.
- have tried selectPersonnel(Personnel p) with #{applicationHome.selectPersonnel(personnel)}- same null result.

[tim_ph]

Correction: when using selectPersonnel(Personnel p) with #{applicationHome.selectPersonnel(personnel)}, it is NOT NULL. But the value is always the value of the first row of the list, no matter what row you click on.

[pmuir]

Try outjecting your datamodel into a longer scope than Request (e.g. page, conversation).

[tim_ph]

When I did that @DataModel(scope=ScopeType.CONVERSATION)
it failed to deploy with this error

2007-08-01 10:25:30,590 INFO [org.jboss.seam.Component] Component: applicationHome, scope: CONVERSATION, type: JAVA_BEAN, class: com.insolve.policy.ApplicationHome
2007-08-01 10:25:30,606 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/tim]] Exception sending context initialized event to listener instance of class org.jboss.seam.servlet.SeamListener
java.lang.RuntimeException: Could not create Component: applicationHome
 at org.jboss.seam.init.Initialization.addComponent(Initialization.java:908)
 at org.jboss.seam.init.Initialization.installComponents(Initialization.java:839)
 at org.jboss.seam.init.Initialization.init(Initialization.java:506)
 at org.jboss.seam.servlet.SeamListener.contextInitialized(SeamListener.java:34)
 at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3854)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4359)
 at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:761)
 at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:741)
 at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:553)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:297)

[smithbstl]

Change your getPersonnels method into a void factory method. Since you are outjecting your DataModel, you don't need to tie it a getter

<h:dataTable var="personnel" value="#{personnels}">
 <h:column>
 <f:facet name="header">action</f:facet>
 <s:link value="Select" action="#{applicationHome.selectPersonnel}"/>
 </h:column>
</h:dataTable>

@Name("applicationHome")
public class ApplicationHome extends EntityHome<Application>
{
...
 @DataModel
 private List<Personnel> personnels;

 @Factory("personnels")
 public void fillPersonnels()
 {
 if (personnels == null)
 personnels = getInstance() == null ? null : new ArrayList<Personnel>(getInstance().getPersonnels());
 }

 @DataModelSelection
 @Out(required = false)
 private Personnel personnel;

 @Logger Log log;

 public void selectPersonnel()
 {
 if (personnel == null) log.info("always null here");
 }
}

[tim_ph]

Haven't gone far on this. I made it @Factory as you suggest, Smith. Also add @Out for datamodel, otherwise it won't see personnels value on the page.

@DataModel
@Out(required=false)
 private List<Personnel> personnels;

then stumble on this error:

12:51:49,243 ERROR [STDERR] Aug 1, 2007 12:51:49 PM com.sun.facelets.FaceletView
Handler handleRenderException
SEVERE: Error Rendering View[/policy/ApplicationEdit.xhtml]
java.lang.ClassCastException: java.util.ArrayList
 at org.jboss.seam.databinding.DataModelBinder.isDirty(DataModelBinder.ja
va:14)
 at org.jboss.seam.Component.outjectDataModel(Component.java:1417)
 at org.jboss.seam.Component.outjectDataModels(Component.java:1402)
 at org.jboss.seam.Component.outject(Component.java:1357)
 at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterc
eptor.java:47)
 at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocation
Context.java:68)
 at org.jboss.seam.persistence.ManagedEntityIdentityInterceptor.aroundInv

BTW, I work on latest Seam 2.0.0.Beta1 with JBoss 4.2.0GA. I know it's beta, but I want to use the framework.
Thanks for the help.

[pmuir]

You don't want to put @Out @DataModel on the same variable.

[pmuir]

Post the whole exception that occurs on startup, there should be some causedby in there.

[tim_ph]

Holly cow! Today, it just works. No problem at all. You are my lucky star, Pete.
I removed all the clutters, and leave minimal code in there. Even though I don't like the part where I have to use single string name for Factory, I have to use it for now rather spend more time on this.
Here's complete code

<h:outputLabel value="No Personnel assigned yet" rendered="#{empty personnels}"/>
 <rich:dataTable var="personnel"
 value="#{personnels}"
 rendered="#{not empty personnels}"
 rowClasses="rvgRowOne,rvgRowTwo"
 id="personnelTable">
 <h:column>
 <f:facet name="header">action</f:facet>
 <h:commandLink value="Select" action="#{applicationHome.selectPersonnel}"/>
 </h:column>
</rich:dataTable>

and ApplicationHome.java

@Name("applicationHome")
public class ApplicationHome extends EntityHome<Application>
{
...
 @DataModel
 private List<Personnel> personnels;

 @Factory("personnels")
 public void fillPersonnels()
 {
 if (personnels == null)
 personnels = getInstance() == null ? null : new ArrayList<Personnel>(getInstance().getPersonnels());
 }

 @DataModelSelection
 private Personnel personnel;

 @Logger Log log;

 public void selectPersonnel()
 {
 if (personnel == null) log.info("personnel is null");
 else log.info("you have selected personnel " + personnel.getName());
 }
}

Using s:link and s:button will reload the whole page, so I have to use h:commandLink and h:commandButton. personnel can then be used to display more info on the same page.
Thank you guys, smithbstl and Pete.