Spring Async ThreadPoolTaskScheduler not initialized

Question

I'm trying to use Async annotation in Spring but I'm getting

java.lang.IllegalStateException: ThreadPoolTaskScheduler not initialized

error, when I try to run the method marked as Async. The following is the configuration for Async:

@EnableScheduling
@EnableAsync
@Configuration 
public class SchedulingConfiguration implements AsyncConfigurer{

    @Override
    public Executor getAsyncExecutor() {
        ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
        scheduler.setPoolSize(10);
        return scheduler;
    }

}

and the following is the declaration of async method.

@Async
@Transactional(value = "baseTransactionManager", isolation = Isolation.READ_COMMITTED)
public void foo(Bar bar) {// some code here}

What am I missing in here?

Thanks in advance.

Yaroslav Stavnichiy · Accepted Answer · 2017-01-16 14:59:13Z

76

You have to explicitly call scheduler.initialize() after setting all properties but before returning the scheduler.

See full working test case here.

edited Jan 16, 2017 at 14:59

answered Jan 16, 2017 at 9:17

Yaroslav Stavnichiy

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6 Comments

small_ticket Over a year ago

Thanks, the exception does not occur but the method with async does not perform either. Are there anything else that I should do?

Yaroslav Stavnichiy Over a year ago

@small_ticket What exactly do you mean by 'does not perform'? The foo() method - is it inside properly configured Spring bean, eg. FooService? Do you call it from other bean where FooService is autowired, or from the same bean?

small_ticket Over a year ago

foo is in a Service FooService and I'm calling it from another Service CallerService where FooService is autowired. The code in the foo does not execute, this is what i mean. It doesn't print the logs, it doesn't insert the necessary data into the database, etc.

small_ticket Over a year ago

Stavnichy I found the reason why my async method is not working. I have to specify componentScan in my Configuration class. My configuration class is imported in the main configuration and I have the component scan in my parent configuration file. However, it is not enough for Async, therefore I've added componentScan to the AyncConfiguration file and everything works just fine. Thanks a lot!

Pino Over a year ago

Note that calling initialize() is necessary only if your scheduler is not a Spring bean, otherwise it is called automatically in afterPropertiesSet().

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