Can a JBoss Service-POJO be a Seam component?

[cvolk]

Can a JBoss Service POJO (@Service-annotated class) be a Seam component?  And if so, can AutoCreate and Startup be used?  I can't seem to find any info on this dev case.

Is there any reason this would be a bad idea?

Thanks!!
Chris

[paata.paatal.magtigsm.ge]

i tried to do this for some days ago, but failed.
@Service bean is very useful for j2ee application.
i have not problem with then in ejb application,
but into my seam application i got this error :

Caused by: java.lang.IllegalArgumentException: @PersistenceContext may only be used on session bean or message driven bean components: commonService

i need this service for loading data from database only one time, also i have reloader.
singleton service has no problem in ejb app.

here is an example of my service component :

@Name("commonService")
@Local(CommonServiceLocal.class)
@Service(objectName = "jboss:custom=CommonServiceBean")
public class CommonServiceBean implements CommonServiceMan, CommonServiceLocal {

     @PersistenceContext
     EntityManager oracleManager;

     private ArrayList<Description> descriptions;
     private Hashtable<Long, Hashtable<Long, Description>> descriptionList;

     public void create() throws Exception {
          System.out.println("Start Creating Common Service");
     }

     public void destroy() throws Exception {
          System.out.println("Start Destroying Common Service");
     }

     public void reloadDescriptions() {
          try {
               long time = System.currentTimeMillis();
               descriptions = (ArrayList<Description>) oracleManager
                         .createNamedQuery("Description.getAllDescriptions")
                         .getResultList();
               if (descriptions != null && !descriptions.isEmpty()) {
                    descriptionList = new Hashtable<Long, Hashtable<Long, Description>>();
                    for (Description description : descriptions) {
                         Hashtable<Long, Description> item = new Hashtable<Long, Description>();
                         item.put(description.getId(), description);
                         descriptionList.put(description.getLanguageId(), item);
                    }
               }
               time = System.currentTimeMillis() - time;
               System.out.println("Descriptions Load Time : " + time);
          } catch (Exception e) {
               e.printStackTrace();
          }
     }

     public void start() throws Exception {
          System.out.println("Starting Common Service");
          try {
               long time = System.currentTimeMillis();
               descriptions = (ArrayList<Description>) oracleManager
                         .createNamedQuery("Description.getAllDescriptions")
                         .getResultList();
               if (descriptions != null && !descriptions.isEmpty()) {
                    descriptionList = new Hashtable<Long, Hashtable<Long, Description>>();
                    for (Description description : descriptions) {
                         Hashtable<Long, Description> item = new Hashtable<Long, Description>();
                         item.put(description.getId(), description);
                         descriptionList.put(description.getLanguageId(), item);
                    }
               }
               time = System.currentTimeMillis() - time;
               System.out.println("Descriptions Load Time : " + time);
          } catch (Exception e) {
               e.printStackTrace();
          }
     }

     public void stop() throws Exception {
          System.out.println("Stopping Common Service");
     }

     public Description getDescriptionByIdAndLang(Long langId, Long descriptionId) {
          System.out.println("Getting Description By ID and Language");
          if (langId == null || descriptionId == null) {
               return null;
          }
          if (descriptionList == null || descriptionList.isEmpty()) {
               return null;
          }
          Hashtable<Long, Description> item = descriptionList.get(langId);
          if (item == null || item.isEmpty()) {
               return null;
          }
          return item.get(descriptionId);
     }
}

PS.
it is great that ejb 3.1 already has singleton services.

[cvolk]

Thanks, Paata, for your input.  I've run into a different problem - I don't get any exceptions, but I need to make sure the service is started before the main logic gets rolling, so I would need a mechanism for that.  If I have any success I'll update this.

Happy Friday...!

[paata.paatal.magtigsm.ge]

hi chris,
seam component class check all your components, it's fields and methods, this exception i got means that if i need @PersistenceContext then this component must be session bean or message driven bean.

Error Stacktrace :

at org.jboss.seam.Component.checkPersistenceContextForComponentType(Component.java:898)
     at org.jboss.seam.Component.scanField(Component.java:874)
     at org.jboss.seam.Component.initMembers(Component.java:554)
     at org.jboss.seam.Component.<init>(Component.java:245)
     at org.jboss.seam.Component.<init>(Component.java:206)
     at org.jboss.seam.init.Initialization.addComponent(Initialization.java:1162)

i don't know is this bug or not.
if you resolve this problem post here.

Regards,

Paata Lominadze

Magticom LTD.