Spring boot. How to Create TaskExecutor with Annotation?

Question

I did a @Service class in Spring Boot application with one of the methods that should run asynchronously. As I read method should be @Async annotated and also I have to run a TaskExecutor bean. But in Spring manual http://docs.spring.io/spring/docs/current/spring-framework-reference/html/scheduling.html I not find any info or example how to run TaskExecutor with annotation, without XML config. Is it possible to create TaskExecutor bean in Spring Boot without XML, with annotations only? Here my Service class:

@Service public class CatalogPageServiceImpl implements CatalogPageService {      @Override     public void processPagesList(List<CatalogPage> catalogPageList) {         for (CatalogPage catalogPage:catalogPageList){             processPage(catalogPage);         }     }      @Override     @Async("locationPageExecutor")     public void processPage(CatalogPage catalogPage) {         System.out.println("print from Async method "+catalogPage.getUrl());     } } 

Answer 1

Add a @Bean method to your Spring Boot application class:

@SpringBootApplication @EnableAsync public class MySpringBootApp {      @Bean     public TaskExecutor taskExecutor() {         ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();         executor.setCorePoolSize(5);         executor.setMaxPoolSize(10);         executor.setQueueCapacity(25);         return executor;     }      public static void main(String[] args) {         // ...     } } 

See Java-based container configuration in the Spring Framework reference documentation on how to configure Spring using Java config instead of XML.

(Note: You don't need to add @Configuration to the class because @SpringBootApplication already includes @Configuration).

Answer 2

First – let’s go over the rules – @Async has two limitations:

• it must be applied to public methods only
• self-invocation – calling the async method from within the same class – won’t work

So your processPage() method should be in separate class