Hands-On High Performance with Spring 5

The @Async annotation

Once asynchronous processing is enabled, then the methods that are annotated with the @Async annotation will execute asynchronously.

The following is a simple example of the @Async annotation:

public class AsyncTask {  private static final Logger LOGGER =   Logger.getLogger(AsyncTask.class);  @Async  public void doAsyncTask() {    try {      LOGGER.info("Running Async task thread : " +       Thread.currentThread().getName());    } catch (Exception e) {    }  }}

We can also annotate the @Async annotation to a method with the return type, as follows:

@Async  public Future<String> doAsyncTaskWithReturnType() {    try     {      return new AsyncResult<String>("Running Async task thread : " +       Thread.currentThread().getName());    }     catch (Exception e) {     }