Stateful bean cache

[Sharmila Punde]

Dear All,
I have stateful bean business interface and class as -

@Local
public interface StatefulTracker {
    public int getId();
    public void destroyBean(int x);
}

@Stateful(name="FirstStatefulBean")
public class StatefulTrackerBean implements StatefulTracker {
    private static int idSta = 1;
    private int id;

    public int getId() {
        return id;
    }

    @PostConstruct
    public void initialize() {
        this.id = idSta;
        System.out.println("postconstruct");
        idSta++;
    }

    @PreDestroy
    public void destroy() {
        System.out.println("predestroy");
    }

    @PrePassivate
    public void passivate() {
        System.out.println("prepassivate");
    }

    @PostActivate
    public void activate() {
        System.out.println("postactivate");
    }

    @Remove
    @Override
    public void destroyBean(int x) {
        System.out.println("remove");
    }
}

I am using glassfish 3.0.1. Using administration tool(http://localhost:4848/common/index.jsf) to configure cache for ejb from
" Common Tasks->Configuration->EJB Container"
I have configured the cache related data as -

Max Cache Size: 2
Cache Resize Quantity: 1
Removal Timeout: 5400
Removal Selection Policy: fifo
Cache Idle Timeout: 40

Beans can be accessed successfully 3 times causes "postconstruct" to print 3 times. But it does not passivate if it is idle for more than 40 seconds. I could never see "prepassivate" unless glassfish is shutdown.

Can someone explains why bean does not passivate if it is idle for more than 40 seconds?

Thanks in advance!