Task calcTask = createCalcTask();

ExecutorService executor = Executors.newFixedThreadPool(1);
Future future = executor.submit(calcTask);
try {
    future.get();
} catch (ExecutionException ex) {
    ex.getCause().printStackTrace();
} catch (InterruptedException e1) {
    e1.printStackTrace();
}

public Task<Object> createCalcTask() {
    return new Task<Object>() {
        @Override
        protected Object call() throws Exception {
            throw new RuntimeException("testE");
        }
    };
}