How to schedule a job in Spring 4 ?

Spring framework provides support for scheduling of task.Spring scheduler is used to  schedule a task to be executed at the given time interval.
In this post, we are going to see how to use Spring scheduler to schedule a job.Annotations are used instead of XML configuration.


@Scheduled - is provided by Spring Framework to schedule a job.

Cron Expression - Cron expression is represented by six fields.

@Scheduled(cron="* * * * * *")

second, minute, hour, day of month, month, day(s) of week

(*) means any

*/x means "every x"

Sample Code: 

AppConfiguration:

package com.javainstance.configuration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;

import com.javainstance.service.Tasks;

/**
 * @author javainstance
 *
 */
@Configuration
@EnableScheduling
public class AppConfiguration {

@Bean
public Tasks getTask() {

return new Tasks();

}


}

Tasks.java

package com.javainstance.service;

import org.springframework.scheduling.annotation.Scheduled;

/**

 * @author javainstance

 *

 */

public class Tasks {

/**

* To execute Task at regular interval

*/

@Scheduled(fixedRate = 4000)

public void doTask1() {

System.out.println("This get executed at fixed interval");

}

/**

* To execute Task at fixed delay after last execution finishes

*/

@Scheduled(fixedDelay = 4000)

public void doTask2() {

System.out.println("This get executed at fixed delay after last execution finishes");

}

/**

* Using Cron expression This task get executed at the interval of 1 hour

* from 1 AM to 11 PM

*/

@Scheduled(cron = "0 0 1-23 * * *")

public void doTask3() {

System.out.println("This get executed at the interval of 1 hour from 1 AM to 11 PM");

}

/**

* Using Cron expression This task get executed everyday at 1 AM

*/

@Scheduled(cron = "0 0 1 * * *")

public void doTask4() {

System.out.println("This task get executed everyday at 1 AM");

}

/**

* Using Cron expression This task get executed everyday at every 10 sec

*/

@Scheduled(cron = "*/10 * * * * *")

public void doTask5() {

System.out.println("This task get executed at every 10 sec");

}

}

TestTask.java

package com.javainstance.test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import com.javainstance.configuration.AppConfiguration;

/**

 * @author javainstance

 *

 */

public class TestTask {

@SuppressWarnings(value = { "resource", "unused" })

public static void main(String[] args) {

ApplicationContext appContext = new AnnotationConfigApplicationContext(AppConfiguration.class);

}

}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>com.javainstance</groupId>

<artifactId>SpringScheduler</artifactId>

<packaging>jar</packaging>

<version>1.0-SNAPSHOT</version>

<name>SpringScheduler Maven Webapp</name>

<url>http://maven.apache.org</url>

<properties>

<springframework.version>4.0.6.RELEASE</springframework.version>

</properties>

<dependencies>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-core</artifactId>

<version>${springframework.version}</version>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>${springframework.version}</version>

</dependency>

</dependencies>

<build>

<finalName>SpringScheduler</finalName>

<plugins>

<plugin>

<artifactId>maven-compiler-plugin</artifactId>

<configuration>

<source>1.8</source>

<target>1.8</target>

</configuration>

</plugin>

</plugins>

</build>

</project>

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