Multiple Spring @Scheduled tasks simultaneously

Question

I'm trying to run multiple scheduled tasks at the same time on spring boot, but in practice they run queuing (one after the other, not parallel)

This is my simple service:

import org.springframework.scheduling.annotation.Scheduled; import org.springframework.stereotype.Service;  @Service public class MyScheduleDemo {      @Scheduled(fixedDelay = 5000, initialDelay = 1000)     public void taskA() throws InterruptedException {         System.out.println("[A] Starting new cycle of scheduled task");          // Simulate an operation that took 5 seconds.         long startTime = System.currentTimeMillis();         while (System.currentTimeMillis() - startTime <= 5000);          System.out.println("[A] Done the cycle of scheduled task");     }      @Scheduled(fixedDelay = 5000, initialDelay = 2000)     public void taskB() throws InterruptedException {         System.out.println("[B] Starting new cycle of scheduled task");          System.out.println("[B] Done the cycle of scheduled task");     } } 

Output:

[A] Starting new cycle of scheduled task [A] Done the cycle of scheduled task [B] Starting new cycle of scheduled task [B] Done the cycle of scheduled task 

But, It should be like:

[A] Starting new cycle of scheduled task [B] Starting new cycle of scheduled task [B] Done the cycle of scheduled task [A] Done the cycle of scheduled task 

What am I doing wrong?

This is my configuration:

@Configuration @EnableAsync @EnableScheduling public class AsyncConfiguration implements AsyncConfigurer {      @Override     @Bean(name = "taskExecutor")     public Executor getAsyncExecutor() {         ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();         executor.setCorePoolSize(6);         executor.setMaxPoolSize(50);         executor.setQueueCapacity(100);         executor.setThreadNamePrefix("customer-Executor-");         executor.initialize();         return executor;     } } 

Answer 1

You should use TaskScheduler for your purpose

@Bean public ThreadPoolTaskScheduler threadPoolTaskScheduler() {     ThreadPoolTaskScheduler threadPoolTaskScheduler = new ThreadPoolTaskScheduler();     threadPoolTaskScheduler.setPoolSize(THREADS_COUNT);     return threadPoolTaskScheduler; } 

Where THREADS_COUNT - total count of tasks which should be executed in parallel. If I understand you correctly, you have only 2 jobs, so you need 2 threads

Answer 2

Alternatively, you can configure this property in your application.properties:

spring.task.scheduling.pool.size=2