Many instances of an application scoped Seam component

Question

Hi,

I have a Seam component annotated like this:

@AutoCreate
@Name("asyncServiceManager")
@Scope(ScopeType.APPLICATION)
public class AsyncServiceManager {

The classes that use it are configured like this:

@In("#{asyncServiceManager}")
private AsyncServiceManager asyncServiceManager;

When running the code, I see that the class AsyncServiceManager is instantiated everytime it is used. As I annotated the class with scope APPLICATION, this should not be the case. I need this class to be a singleton, so to speak...

Thanks!

Answer 1

Hi raoul,

Seam in Action book says:

Any components marked as application-scoped startup components (i.e., annotated with both @Startup and @Scope(ScopeType.APPLICATION)) are automatically instantiated by Seam at this time.

So i think @AutoCreate annotation should be removed.

Seam uses SeamListener to bootstrap @Scope(ScopeType.APPLICATION) marked components.

regards,

Answer 2

Additionally, you can simply your configuration. You don't need this:

@In("#{asyncServiceManager}")

Instead, since your variable name is identical to the component name, this is sufficient

@In
private AsyncServiceManager asyncServiceManager;

Depending on how often your component is used (this is an optimization), you can make it an event-scoped component, have it auto-created when an event is observed, and then let it get destroyed after that.

Walter