Spring scheduled use wrong thread pool when specific scheduler is used.

[jurek7]

I observed that wrong thread pool is used when I specify scheduler via scheduler parameter in @scheduled annotation.

package com.grainger.etl.jobs.config;

import java.util.concurrent.TimeUnit;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;

@Configuration
@Slf4j
public class POC {

  @Bean
  public TaskScheduler xxxx() {
    ThreadPoolTaskScheduler threadPoolTaskScheduler = new ThreadPoolTaskScheduler();
    threadPoolTaskScheduler.setPoolSize(1);
    threadPoolTaskScheduler.setThreadNamePrefix("xxxx");
    return threadPoolTaskScheduler;
  }

  @Scheduled(fixedRate = 15, timeUnit = TimeUnit.SECONDS, scheduler = "xxxx")
  public void scheduleX() {
    log.info("Scheduled using xxxx thread pool {}", Thread.currentThread().getName());
  }

  @Bean
  public TaskScheduler yyyy() {
    ThreadPoolTaskScheduler threadPoolTaskScheduler = new ThreadPoolTaskScheduler();
    threadPoolTaskScheduler.setPoolSize(1);
    threadPoolTaskScheduler.setThreadNamePrefix("yyyy");
    return threadPoolTaskScheduler;
  }

  @Scheduled(fixedRate = 15, timeUnit = TimeUnit.SECONDS, scheduler = "yyyy")
  public void scheduleY() {
    log.info("Scheduled using yyyy thread pool {}", Thread.currentThread().getName());
  }
}

Output without datadog agent enabled:

2024-10-23T15:19:21.628+02:00  INFO 123249 --- [          xxxx1] com.grainger.etl.jobs.config.POC         : Scheduled using xxxx thread pool xxxx1
2024-10-23T15:19:21.628+02:00  INFO 123249 --- [          yyyy1] com.grainger.etl.jobs.config.POC         : Scheduled using yyyy thread pool yyyy1

Output with datadog enabled(-javaagent:/home/juri/projects/dd-java-agent.jar):

2024-10-23T15:20:55.253+02:00  INFO 125874 --- [pool-3-thread-1] com.grainger.etl.jobs.config.POC         : Scheduled using xxxx thread pool pool-3-thread-1
2024-10-23T15:20:55.254+02:00  INFO 125874 --- [pool-3-thread-1] com.grainger.etl.jobs.config.POC         : Scheduled using yyyy thread pool pool-3-thread-1