public class ApplicationToSessionProducer
{
   @Inject
   Instance<AScoped> ascoped;
   
   @Produces
   @SessionScoped
   public SThing getThing() {
      
      try
      {
         Thread.sleep(2000);
      }
      catch (InterruptedException e)
      {
         e.printStackTrace();
      }
      
      ascoped.get().foo();
      
      return new SThing();
   }
}

public class SessionToApplicationProducer
{
   @Inject
   Instance<SScoped> sscoped;
   
   @Produces
   @ApplicationScoped
   public AThing getThing() {
      
      sscoped.get().foo();
      
      return new AThing();
   }
}

@ApplicationScoped
public class AScoped
{
   public void foo() {}
}

@SessionScoped
public class SScoped implements Serializable
{
   public void foo() {}
}