Spring Boot @Async method in controller is executing synchronously

Question

My [basic] Spring Boot application accepts a request from the browser, sent via jQuery.get() and is supposed to immediately receive a response - such as \"y

Answer 1

I had a similar issue and I had the annotations @Async and @EnableAsync in the correct beans and still the method was executing synchronously. After I checked the logs there was a warning saying that I had more than one bean of type ThreadPoolTaskExecutor and none of them called taskExecutor So...

@Bean(name="taskExecutor")
public ThreadPoolTaskExecutor defaultTaskExecutor() {
     ThreadPoolTaskExecutor pool = new ThreadPoolTaskExecutor();
     //Thread pool configuration
     //...
     return pool;
}

See http://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/scheduling/concurrent/ThreadPoolTaskExecutor.html for the configuration available for the thread pool.