No application context active

[tonylmai]

I run into an exception with No application context active. I think it caused by my JMS subscriber trying to gain access to a Seam component when a new JMS message arrives.

@Scope(ScopeType.APPLICATION)
@Name("tdOrdersListener")
@Startup(depends={"myComp"})
public class OrdersListenerAlt {
    @In
    private MyComp myComp;

    private class ExListener implements MessageListener {
     @Override
     public void onMessage(Message msg) {
            ...
            if (myComp == null) {
                myComp = (MyComp) Contexts.getSessionContext().get("myComp"); //This code threw 'No application context active'
                myComp = (MyComp) Component.getInstance("myComp", true); // Still won't work
            }
        }
    }

How can I create/obtain an application context manually? Is there a different way?

I am running Seam 2.0.0GA under JBoss 4.2.1GA.

Regards,
tony

[dhinojosa]

MyComp myComp = (MyComp) Contexts.getApplicationContext().get("myComp");

I haven't done JMS stuff in Seam yet (I will this week). But I know Contexts have a getApplicationContext method

[tonylmai]

That too was not available (Contexts.getApplicationContext() returned null).

[dhinojosa]

1. What does MyComp look like?
2. Is it installed during deployment or explosion (as seen in the app server console)?
3. If MyComp doesn't have configuration annotations, how are they configured in components.xml?

[tonylmai]

MyComp is defined as followed:

@Scope(ScopeType.APPLICATION)
@Name("myComp")
@Startup
public class MyComp implements Serializable {
...
   @Create
   public void init() {
   ...
   }

[dhinojosa]

http://jira.jboss.org/jira/browse/JBIDE-1574

Is there room for redesign and see if that works?  Supposedly there is a fix for the latest release.

[tonylmai]

Refactored and still Contexts.getApplicationContext() returned null and Component.getInstance(myComp, true) threw No application context active.

I think I still need to somehow tap onto Seam's application context. Unfortunately org.jboss.seam.contexts.ApplicationContext does not offer such getInstance() method.

My only reason to create this JMS listener was that I could not get my MDB to work with remote queue (see my other post on Seam MDB with remote topic). With plain JMS, I was able to get the messages. Yet my MDB just sit there idling. :(

Any idea?

Thanks

[mokua]

To get the contexts try:

import org.jboss.seam.contexts.Lifecycle;

boolean createContexts = !Contexts.isEventContextActive() && !Contexts.isApplicationContextActive();
                if (createContexts) {
                    Lifecycle.beginCall();
                }

[dhinojosa]

Something strange, I tried it out and I had to make my MDB as stateless. If it truly is an MDB. So you wouldn't make a lot of sense for an application scope MDB. Without having it as an MDB, all gets injected fine and it works.

The code I used is yours with some necessities.

@Scope(ScopeType.APPLICATION)
@Name("myComp")
@Startup
public class MyComp implements Serializable {

    @Create
    public void init() {

    }
}

and this is what I changed, as you can see an application scoped and stateless bean really doesn't make sense.

import org.jboss.seam.Component;
import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.annotations.Startup;
import org.jboss.seam.contexts.Contexts;

import javax.jms.Message;
import javax.jms.MessageListener;
import javax.ejb.MessageDriven;
import javax.ejb.ActivationConfigProperty;
import javax.ejb.Stateless;

@Stateless
@Scope(ScopeType.APPLICATION)
@Name("tdOrdersListener")
@Startup(depends = {"myComp"})
@MessageDriven(activationConfig = {
        @ActivationConfigProperty(propertyName = "destinationType",
                propertyValue = "javax.jms.Queue"),
        @ActivationConfigProperty(propertyName = "destination",
                propertyValue = "queue/tolltag") })
public class OrdersListenerAlt implements MessageListener {
    @In
    private MyComp myComp;

    public MyComp getMyComp() {
        return myComp;
    }

    public void setMyComp(MyComp myComp) {
        this.myComp = myComp;
    }

    @Override
    public void onMessage(Message msg) {
        if (myComp == null) {
            myComp = (MyComp) Contexts.getSessionContext().get("myComp"); //This code threw 'No application context active'
            myComp = (MyComp) Component.getInstance("myComp", true); // Still won't work
        }
    }
}