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I found that I can use org.jboss.ejb3.common.proxy.plugins.async.AsyncUtils in the following way:

@Stateful
public class ComputerBean implements ComputerRemote {
 
    @EJB
    private ProcessorLocal processor;
 
    public void startComputations() {
        Random r = new Random();
        while(true) {
            AsyncUtils.mixinAsync(processor).compute(r.nextInt());
        }
    }
}

Then it is possible to use Future interface to get result (when it will be ready). I tested it - works, but I have also noticed something strange. Let's consider following code:

@Stateless
public class ProcessorBean implements ProcessorLocal {
 
    private static int COUNTER = 0;
 
    @PostConstruct
    public void init() {
        System.out.println("constructing");
        COUNTER++;
    }
 
    @PreDestroy
    public void destroy() {
        System.out.println("destroying");
        COUNTER--;
    } 
 
    public void compute(int i) {
        System.out.println("----------------> " + COUNTER);
 
        // some dummy computations - it's here only in order to take some time
        double d = 0.3;
        for (int j=0; j<100; j++) {
            d+= 0.2 % 4 + i;
        }
    }
}

Counter is increased and printed to the console - it looks as SLSB are pooled and their number is increased when needed.
However, counter is _never_ decremented - even if I stop computations for 15 minutes and then restart it.

I would say that I expected that after some downtime number of pooled SLSB will go to some small number.

Is this something wrong with my code (some hold references etc.) ?

Thanks,
Piotr