why #Asynchronous and Future Class does not work - asynchronous

Question

I am trying to call asynchronous method that returns Future Object, I suppose that it will print YYY and then XXX since the XXX is in a method that is 1 sec long. however, after deploying the code, it did not work properly, I tried the same thing with 10 objects and they printed sequentially. where is the error
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package testfuture;
import java.net.InetAddress;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import javax.ejb.Asynchronous;
import javax.ejb.Schedule;
import javax.ejb.Singleton;
import javax.ejb.TransactionManagement;
import javax.ejb.TransactionManagementType;
#Singleton
#TransactionManagement(TransactionManagementType.BEAN)
public class TestFuture {
#Schedule(minute = "*/1", hour = "*", persistent = false)
public void start() {
try{
Future<String> r = inparallelMethod(5) ;
System.out.print("YYY");
r.get();
}
catch ( InterruptedException ie )
{
System.out.print(ie.getMessage());
}
catch (ExecutionException e)
{
System.out.print(e.getMessage());
}
}
#Asynchronous
public Future<String> inparallelMethod(int i) throws InterruptedException
{
Thread.sleep(1000);
System.out.print("XXX");
return null;
}
}

Answer 1

Because you call inparallelMethod inside the instanced class "bybassing" container managmenet of calling an async menthod.
You have to define the async method in another bean, #Inject that bean and call the method.
#Singleton
#TransactionManagement(TransactionManagementType.BEAN)
public class TestFuture {
#Inject
AsyncService service;
#Schedule(minute = "*/1", hour = "*", persistent = false)
public void start() {
try{
Future<String> r = service.inparallelMethod(5) ;
System.out.print("YYY");
r.get();
}
catch ( InterruptedException ie )
{
System.out.print(ie.getMessage());
}
catch (ExecutionException e)
{
System.out.print(e.getMessage());
}
}
}
#Stateless
public class AsyncService {
#Asynchronous
public Future<String> inparallelMethod(int i) throws InterruptedException
{
Thread.sleep(1000);
System.out.print("XXX");
return null;
}
}
I post the code to make work the async but your code in very poor to test an async scenario, Thread.sleep inside a java-ee is a very bad practice because thread are managed by container and you can't know wich thread you are really sleeping!