@Action
    public Task search() {
       return new SearchTask(getApplication());
    }
 
    private class SearchTask extends Task {
        private String searchQuery;
        private List searchList;
 
 
        SearchTask(org.jdesktop.application.Application app) {
            super(app);
 
        searchList = org.jdesktop.observablecollections.ObservableCollections.observableList(query.getResultList());
 
        }
        //public <PropertyType> get<PropertyName>();
 
 
         @Override protected Void doInBackground() {
            try {
                setProgress(0, 0, 4);
                setMessage("Rolling back the current changes...");
                setProgress(1, 0, 4);
                entityManager.getTransaction().rollback();
                Thread.sleep(1000L); // remove for real app
                setProgress(2, 0, 4);
 
                setMessage("Starting a new transaction...");
                entityManager.getTransaction().begin();
                Thread.sleep(500L); // remove for real app
                setProgress(3, 0, 4);
 
                setMessage("Fetching new data...");
                java.util.Collection data = query.getResultList();
                Thread.sleep(1300L); // remove for real app
                setProgress(4, 0, 4);
 
                Thread.sleep(150L); // remove for real app
                list.clear();
                list.addAll(data);
            } catch(InterruptedException ignore) { }
            return null;
        }
        @Override protected void finished() {
            setMessage("Done.");
            setSaveNeeded(false);
        }
    }