Async method in Spring Boot

Question

I have a problem with sending email with method annotated as @Async. Firstly, I am not sure if it is possible to work as I want so I need help with explanation.

Here is what am doing now:

In main method i have annotation

@EnableAsync(proxyTargetClass = true)

Next I have AsyncConfig class

import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.annotation.AsyncConfigurerSupport; import java.util.concurrent.Executor; import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor; @Configuration public class AsyncConfig extends AsyncConfigurerSupport { @Override public Executor getAsyncExecutor() { ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor(); executor.setCorePoolSize(2); executor.setMaxPoolSize(2); executor.setQueueCapacity(500); executor.setThreadNamePrefix("email-"); executor.initialize(); return executor; } }

Of course, its rest application so i have controller, service etc, looks normally, nothing special

My async method looks like this:

 @Async public void sendEmail() throws InterruptedException { log.info("Sleep"); Thread.sleep(10000L); //method code log.info("Done"); }

I executing this method in another service method:

@Override public boolean sendSystemEmail() { try { this.sendEmail(); } catch (InterruptedException e) { e.printStackTrace(); } log.info("pending sendEmail method"); return true; }

Now what I want archive is to ignore executing sendEmail() function and execute return true; meanwhile function sendEmail() will be executing in another Thread. Of course it doesn't work now as I want. Unfortunately.

Note that I am new into async programming, so I have lack of knowledge in some parts of this programming method.

Thanks for any help.

Ah the classic error/misunderstanding. For async processing spring uses AOP. AOP is applied using proxies, which means only calls INTO the object will get AOP applied. You are doing a method call from inside the proxy. You need to call sendMail externally and not internally. — M. Deinum
– M. Deinum, Commented Apr 25, 2017 at 10:03

Almas Abdrazak · Accepted Answer · 2017-07-20 04:46:04Z

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

The reasons are simple – the method needs to be public so that it can be proxied. And self-invocation doesn’t work because it bypasses the proxy and calls the underlying method directly.

http://www.baeldung.com/spring-async

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