Question

in a webapp i want to run an async thread for a long process and let the client knows the progress status.
For this i thought to use this abstract class:

public abstract class ThreadProvider implements Runnable{

    protected Thread thread;

    public boolean create() throws SystemException{
        if(thread!=null && thread.isAlive()) throw new SystemException("Il processo è già in esecuzione");
        thread = new Thread(this);
        thread.start();
        return true;
    }
}

And this is my impl:

@Service @Transactional
public class ChiusuraProvider extends ThreadProvider {

    private static Logger gdf = Logger.getLogger("gdf");
    private static Logger log = Logger.getLogger(ChiusuraProvider.class);

    protected Dao dao;
    protected CinetelProvider cinetelProvider;

    @Override
    public void run() {...}
}

Everything works: the thread starts and seems that the autowire works… however Hibernat did not find any session (maybe because i change thread)… how to solve this?

Thanks

Answer 1

@Transactional doesn’t work in this case, see 10.5.1 Understanding the Spring Framework’s declarative transaction implementation.

You can use programmatic transaction management (TransactionTemplate) inside your run method, or extract transactional logic into separate bean and make it @Transactional.