asynchronous - Calling a long running process asynchronously on a button click in JSF

Question

I want to execute a stored proc by clicking on a button developed in JSF and Java. The proc takes roughly around 30 minutes in execution.

When the user clicks on this button, s/he should get a default message like -

Data is being processed. Kindly login after 60 minutes to check the data.

Now when we click on the button, the UI Page hangs for the time when the proc is getting executed.

Is there a workaround to show this default message and run the proc in the backend?

Answer 1

Just trigger an @Asynchronous EJB method. It'll fire and forget a separate thread and the bean action method will immediately return.

@Named
public class Bean {

    @EJB
    private Service service;

    public void submit() {
        service.asyncDoSomething();

        // Add message here.
    }

}

@Stateless
public class Service {

    @Asynchronous
    public void asyncDoSomething() {
        // ...
    }

}

See also:

• Is it safe to start a new thread in a JSF managed bean?
• How can server push asynchronous changes to a HTML page created by JSF?