CODEWITHSUNDEEP
javaspring-bootscheduler
Mohith Kumar
Mohith Kumar

Reputation: 647

Scheduler not running in Spring Boot

I have created a Spring Boot application. I have configured my class that contains the scheduler method startService(). Below is my code :

Service Class :

package com.mk.service;  
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import com.mk.envers.model.BossExtChange;
import com.mk.envers.model.BossExtChangeRepository;

@Component
public class EnverseDemoService {

    @Autowired
    BossExtChangeRepository bossExtChangeRepository;

    @Scheduled(fixedRate = 30000)
    public void startService() {
        System.out.println("Calling startService()");
        BossExtChange bossExtChange = bossExtChangeRepository.findById(5256868L);
        System.out.println("bossExtChange.getDescription()--->"+bossExtChange.getDescription());
        System.out.println("Ending startService()");
    }
}

Main Class :

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.PropertySource;
import org.springframework.scheduling.annotation.EnableScheduling;

@SpringBootApplication
@EnableScheduling
@PropertySource("classpath:application.properties")
public class EnverseDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(EnverseDemoApplication.class, args);
    }
}

I have annotated the class as @Component and also method as @Scheduled(fixedRate = 30000) that will running as a scheduler. But while running the application as Spring Boot the scheduler does not trigger. The console show the below message:

2016-02-03 10:56:47.708  INFO 10136 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup 
2016-02-03 10:56:47.721  INFO 10136 --- [           main] com.mk.envers.EnverseDemoApplication     : Started EnverseDemoApplication in 3.231 seconds (JVM running for 3.623)
2016-02-03 10:56:47.721  INFO 10136 --- [       Thread-2] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@49e202ad: startup date [Wed Feb 03 10:56:44 IST 2016]; root of context hierarchy
2016-02-03 10:56:47.721  INFO 10136 --- [       Thread-2] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown 
2016-02-03 10:56:47.736  INFO 10136 --- [       Thread-2] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'

Can anyone please help me out.

Upvotes: 39

Views: 87448

Answers (14)

Sachin Kumar
Sachin Kumar

Reputation: 169

In my case, 1 more scheduled task was already present(and running). If another scheduled task runs indefinitely, it might block the execution of other scheduled tasks. Creating the below bean solved my issue. I was using Spring Boot 3.6.0 and Java 17.

To increase the thread pool size, configure a custom task scheduler:

@Bean
public TaskScheduler taskScheduler() {
    ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
    scheduler.setPoolSize(10); // Adjust pool size as needed
    scheduler.setThreadNamePrefix("ScheduledTask-");
    return scheduler;
}

Upvotes: 0

Omar El Hussein
Omar El Hussein

Reputation: 1057

Just in case someone has this issue with an already existing Spring Boot application, I had a case that was really difficult to discover. My Scheduler was basically blocked by another scheduled method, so one scheduler was blocking the others without me knowing. I had to annotate the blocking scheduler with @Async

Upvotes: 3

Hett
Hett

Reputation: 3813

In my case I created @Component with class name name TaskExecutor, and spring boot just ignored this bean.

Upvotes: 0

Vibhuti Singh Gaharwar
Vibhuti Singh Gaharwar

Reputation: 11

Apart from things Swapnil mentioned in his answer (though not the case with OP), the method on which Scheduled annotation is placed must be a public class

Upvotes: 1

Soid
Soid

Reputation: 2859

In my case I had @PostConstruct code in a loop which prevent spring context from finishing initialization, hence it didn't run scheduled methods.

Upvotes: 0

Matteo Gallinucci
Matteo Gallinucci

Reputation: 38

In my case I had an abstract @Service class containing the @Scheduled method, removing the abstract keyword it worked.

Upvotes: 0

Abd Abughazaleh
Abd Abughazaleh

Reputation: 5495

In my case I only add @Component at the same class I used the @Scheduled

Upvotes: -1

Gati Krishna Meher
Gati Krishna Meher

Reputation: 21

Please check if in application.properties you have "spring.main.lazy-initialization=true"

Remove this from application.properties.

Even if you have all the configuration correct, this simple line will enable lazy loading due to which your @Component will initalize during application start.

Upvotes: 2

Nisha Mittal
Nisha Mittal

Reputation: 15

As Swapnil already mentioned all the check-points to make sure while using cron. One additional thing you should do: Always verify your cron expression whether it's in right format or not, using below reference site - http://www.freeformatter.com/cron-expression-generator-quartz.html#

Upvotes: 1

Swapnil Pasarkar
Swapnil Pasarkar

Reputation: 653

I was able to solve the issue, I forgot to provide @service level annotation, I have created the check List for @Scheduler, kindly go through every point one by one, It will help you to solve the issue.

  1. Check for the @EnableScheduling on SpringBoot Main class.
  2. Scheduled method should be annotated with @Scheduled, Follow the @Scheduled Method rules. a method should have the void return type, a method should not accept any parameters.
  3. Make sure the class should be annotated with @Service or @Component Annotation so SpringBoot can make the object of that class.
  4. The package of the scheduler jobs should be under the main Application class's package. e.g com.company is your main application class package then scheduler class package should be com.company.scheduler,
  5. If you are using Cron expression confirm the same e.g @Scheduled( cron = "0 0/2 * * * ?"), This Cron expression will schedule the task for every 2 min.

Feel free to add more points in the comment so it will help to solve the issue.

Upvotes: 52

Santi Barbat
Santi Barbat

Reputation: 2295

In my case, was the lazy-initialization with value true which was preventing my @Component to be loaded by Spring at startup and @Scheduled method was never running.

Make sure the Spring Boot lazy initialization is disabled.

Upvotes: 7

Pravin Bansal
Pravin Bansal

Reputation: 4681

It must be that you forgot to add @EnableScheduling annotation in your app class. 

public static void main(String[] args) {
        context = SpringApplication.run(YouApplication.class, args);
    }

Upvotes: 19

Federico Traiman
Federico Traiman

Reputation: 1251

May be you can solve this problem by adding the @ComponentScan annotation in the configuration file 

@SpringBootApplication
@EnableScheduling
@ComponentScan(basePackages = "com.mk.service")
@PropertySource("classpath:application.properties")
public class EnverseDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(EnverseDemoApplication.class, args);
    }
}

Upvotes: 41

Mohith Kumar
Mohith Kumar

Reputation: 647

I was finally able to solve the above issue, I changed the package of my service class EnverseDemoService from package com.mk.service; to com.mk.envers.service;. This is because if the main configuration class EnverseDemoApplication is present in the package com.mk.envers. All the other classes in the boot application should be in the qualifying package. Eg: com.mk.envers.*;

Upvotes: 15

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