JAVA EE: How to schedule jobs using @Scheduled annotation (Initial delay) in spring?

Saturday 15 December 2018

How to schedule jobs using @Scheduled annotation (Initial delay) in spring? | Spring tutorial

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How to schedule jobs using @Scheduled annotation (Initial delay) 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(fixedDelay = 10000, initialDelay = 4000)

    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 01, 2018 9:22:30 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@4783da3f: startup date [Sat Dec 01 09:22:30 IST 2018]; root of context hierarchy

Dec 01, 2018 9:22:30 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [Spring-Scheduler.xml]

Dec 01, 2018 9:22:31 AM org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor finishRegistration

INFO: No TaskScheduler/ScheduledExecutorService bean found for scheduled processing

Current time = 09:22:35

Current time = 09:22:45

Current time = 09:22:55