Accessing @DataModel in POJO

[notify]

Have returned to my Seam App after some months away.

Have had no trouble populating my List using a method in my EJB (3.x) as DataModel

@DataModel
private List <Postcards> postcardsList;

and interating through it in the XHTL and displaying it using

<rich:dataTable id="dataTableYourPhotographs" value="#{postcardsList}" var="postcards" columns="5" >

However I need to access it in POJO, but it always 'null', though I can see in the EJB when I delete an item it has the a number of Entities in the list.

In the POJO method called from the XHTML page "postcardsList" is always null.

What have I missed?

Thanks.

[lvdberg]

Hi,

I assume the EJB is a stateful bean, which by default has a conversation scope, while a normal bean has a event scope. I cant see the rest of your code, but it is most ceratinly the cause of your problem.

Leo

[notify]

Leo,

Yes it's a Stateful EJB, but the scope is set to session.

@Stateful
@Name(postcardBean)
@Interceptors(SeamInterceptor.class)
@JndiName(ejb/PostcardRemote)
@Scope(ScopeType.SESSION)
public class PostcardBean implements PostcardRemote, NOTiFYPiNPOiNTConstants, NOTiFYPiNPOiNTSQL {

[lvdberg]

Hi,

this explains why it always works. The bean is created when you start the session and stays in memory until the user signs-off. How is the list of entities created ? and have you done the same for the POJO )session scope)?

Leo

P.S:  please send in additional code because I am not a medium.

[notify]

How is the list of entities created ? and have you done the same for the POJO )session scope)?

The Enities are created here;

@SuppressWarnings({ "unchecked" })
@Factory("postcardsList")  
public final List <Postcards> getPostCardsByDomain() {
          Query query = entityManager.createQuery(GET_POSTCARDS_BY_DOMAIN);
          query.setParameter(ONE, this.getDomain(credentials.getUsername()));
          
              this.postcardsList = query.getResultList();
              log.info(">>>>> getPostCardsByDomain postcardsList.size = " + postcardsList.size());

              return this.postcardsList;
}

and stored in the list;

@DataModel
@Out (required = false)
private List <Postcards> postcardsList;

I am trying to inject the postcardsList (the DataModel) into the POJO.

The POJO is referenced in the faces-config.xml with a scope of session;

<managed-bean>
        <managed-bean-name>fileUploadBean</managed-bean-name>
        <managed-bean-class>com.notifypinpoint.pojos.FileUploadBean</managed-bean-class>
        <managed-bean-scope>session</managed-bean-scope>
</managed-bean>

[lvdberg]

Ok,

that makes sense now. You're not using a Seam managed bean. Try making the POJO a seam.bean by adding the name- and scope annotations and try again.

Leo

[notify]

Try making the POJO a seam.bean by adding the name- and scope annotations and try again.

I already had;

@Name("fileUploadBean")
@Scope(ScopeType.SESSION)
public class FileUploadBean implements NOTiFYPiNPOiNTConstants {

[lvdberg]

Hi,

If you have the POJO as a Seam bean, why are you defining it again in faces-config.xml ?

Leo

[notify]

If you have the POJO as a Seam bean, why are you defining it again in faces-config.xml ?

Leo,

I realised whilst I was out I was mixing a POJO with a Seam Bean. Thanks for highlighting it to me.

My EAR won't deploy now as it says;

ERROR [[/]] Exception sending context initialized event to listener instance of class org.jboss.seam.servlet.SeamListener
java.lang.RuntimeException: Could not create Component: imagesBean

Do I have registers any Seam Componets to use a Seam Bean?

Thanks for your help.

[lvdberg]

Hi,

you must follow the basic rules for Seam , meaning add configurations to web.xml and  - if you use facelets - the view handler setting in faces config and also the seam.properties file inside META-INF (or other jars). The seam documentation contains a clear explanation how to configure a basic seam environment and seam-gen can help you kick-start your new application.

Leo

[notify]

you must follow the basic rules for Seam , meaning add configurations to web.xml and  - if you use facelets - the view handler setting in faces config and also the seam.properties file inside META-INF (or other jars). The seam documentation contains a clear explanation how to configure a basic seam environment and seam-gen can help you kick-start your new application.

Cleaned up my JBoss directories etc and all is well and the Entity is being injected.

Thanks for your patience and suggestions.