Cron scheduler In Springboot

 Cron scheduler is a scheduling tool that allows you to schedule tasks or jobs to run at specific intervals. These tasks can be anything from simple scripts to complex programs, and they can be run on various platforms, including Linux, Unix, and Windows.

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To implement a cron scheduler with Spring Boot, you will need to do the following:

Add the Spring Boot starter for scheduling to your project. This can be done by adding the following dependency to your pom.xml file:

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<dependency>
<groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-scheduling</artifactId>
</dependency>

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Create a class that will contain the task or job that you want to schedule. This class should be annotated with @Component and should contain a method that is annotated with @Scheduled.

 For example:

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@Component
public class MyTask {
    @Scheduled(cron = "1 * * * * *")
    public void run() {
        // code for task here
    }
}

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In the @Scheduled annotation, you can specify the cron expression that determines when the task will be run. In the above example, the task will be run every 50 seconds.

In your application's main class, you should also enable scheduling by adding the @EnableScheduling annotation. For example:

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@SpringBootApplication
@EnableScheduling
public class MyApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

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Run your application and the task will be run at the specified intervals according to the cron expression.

Note: The cron expression above is for running the task every 50 seconds.

Note: It is important to test the cron expression before running the task in production to make sure it runs as expected.

Note: Cron expressions are very powerful, but also very tricky to get right. There are many online tools, such as crontab.guru, that can help you generate the correct expression for your needs.

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