How to schedule jobs using @Scheduled annotation (Cron expression) in spring? | Spring Tutorial

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How to schedule jobs using @Scheduled annotation (Cron expression) in spring? | Spring Tutorial

How to schedule jobs using @Scheduled annotation (Cron expression) in spring? | Spring Tutorial

How to schedule jobs using @Scheduled annotation (Cron expression) in spring? | Spring Tutorial

How to schedule jobs using @Scheduled annotation (Cron expression) in spring? | Spring Tutorial

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.ram.core</groupId>
    <artifactId>SpringDemo</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>SpringDemo</name>
    <url>http://maven.apache.org</url>

    <properties>
        <spring.version>5.0.9.RELEASE</spring.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>


        <!-- Spring 5 dependencies -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context-support -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>

    </dependencies>

</project>

ScheduledTasks.java

package com.ram.scheduler;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
@EnableScheduling
public class ScheduledTasks
{

    private static final SimpleDateFormat dateFormat = new SimpleDateFormat(
            "HH:mm:ss");

    @Scheduled(cron = "0 * * ? * *")
    public void reportCurrentTime()
    {
        System.out.println(
                "Current time = " + dateFormat.format(new Date()));
    }
}

Spring-Scheduler.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <context:component-scan base-package="com.ram" />

</beans>

App.java

package com.ram.core;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App
{
    public static void main(String[] args)
    {
        ApplicationContext context = new ClassPathXmlApplicationContext(
                "Spring-Scheduler.xml");
    }
}

Output

Dec 03, 2018 9:45:57 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@4783da3f: startup date [Mon Dec 03 09:45:57 IST 2018]; root of context hierarchy
Dec 03, 2018 9:45:57 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [Spring-Scheduler.xml]
Dec 03, 2018 9:45:58 AM org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor finishRegistration
INFO: No TaskScheduler/ScheduledExecutorService bean found for scheduled processing
Current time = 09:46:00
Current time = 09:47:00
Current time = 09:48:00
Current time = 09:49:00

Refer:
https://www.freeformatter.com/cron-expression-generator-quartz.html
 
Click the below link to download the code:
https://sites.google.com/site/ramj2eev2/java_basics/SpringDemo_Schedule_CRON_Annotation.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/javaee/tree/master/Spring_2018/SpringDemo_Schedule_CRON_Annotation

Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/0989e369f77ed192b0b224588ebfcdeb2019a6a2/Spring_2018/SpringDemo_Schedule_CRON_Annotation/?at=master

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