Bael-3391 - Removing Spring Boot template
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Kyle Doyle
parent
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01e208472e
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<component name="ProjectRunConfigurationManager">
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<configuration default="false" name="Remote Debugger" type="Remote">
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<option name="USE_SOCKET_TRANSPORT" value="true" />
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<option name="SERVER_MODE" value="false" />
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<option name="SHMEM_ADDRESS" />
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<option name="HOST" value="localhost" />
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<option name="PORT" value="5005" />
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<option name="AUTO_RESTART" value="false" />
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<RunnerSettings RunnerId="Debug">
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<option name="DEBUG_PORT" value="5005" />
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<option name="LOCAL" value="false" />
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</RunnerSettings>
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<method v="2" />
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</configuration>
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</component>
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If you have not previously done so, please fill out and
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submit the https://cla.pivotal.io/sign/spring[Contributor License Agreement].
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All code in this repository is:
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=======================================================================
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Copyright (c) 2013 GoPivotal, Inc. All Rights Reserved
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Except where otherwise noted, this work is licensed under https://creativecommons.org/licenses/by-nd/3.0/
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:toc:
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:spring_version: current
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:icons: font
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:source-highlighter: prettify
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:project_id: gs-scheduling-tasks
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This guide walks you through the steps for scheduling tasks with Spring.
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== What you'll build
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You'll build an application that prints out the current time every five seconds using Spring's `@Scheduled` annotation.
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== What you'll need
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:java_version: 1.8
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include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/prereq_editor_jdk_buildtools.adoc[]
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include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/how_to_complete_this_guide.adoc[]
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include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/hide-show-gradle.adoc[]
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include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/hide-show-maven.adoc[]
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include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/hide-show-sts.adoc[]
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[[initial]]
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== Create a scheduled task
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Now that you've set up your project, you can create a scheduled task.
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`src/main/java/hello/ScheduledTasks.java`
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[source,java]
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----
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include::complete/src/main/java/hello/ScheduledTasks.java[]
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----
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The `Scheduled` annotation defines when a particular method runs.
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NOTE: This example uses `fixedRate`, which specifies the interval between method invocations measured from the start time of each invocation. There are https://docs.spring.io/spring/docs/{spring_version}/spring-framework-reference/html/scheduling.html#scheduling-annotation-support-scheduled[other options], like `fixedDelay`, which specifies the interval between invocations measured from the completion of the task. You can also https://docs.spring.io/spring/docs/{spring_version}/javadoc-api/org/springframework/scheduling/support/CronSequenceGenerator.html[use `@Scheduled(cron=". . .")` expressions for more sophisticated task scheduling].
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== Enable Scheduling
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Although scheduled tasks can be embedded in web apps and WAR files, the simpler approach demonstrated below creates a standalone application. You package everything in a single, executable JAR file, driven by a good old Java `main()` method.
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`src/main/java/hello/Application.java`
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[source,java]
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----
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include::complete/src/main/java/hello/Application.java[]
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----
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include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/spring-boot-application.adoc[]
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https://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#scheduling-enable-annotation-support[`@EnableScheduling`] ensures that a background task executor is created. Without it, nothing gets scheduled.
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include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/build_an_executable_jar_subhead.adoc[]
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include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/build_an_executable_jar_with_both.adoc[]
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Logging output is displayed and you can see from the logs that it is on a background thread. You should see your scheduled task fire every 5 seconds:
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....
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[...]
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2016-08-25 13:10:00.143 INFO 31565 --- [pool-1-thread-1] hello.ScheduledTasks : The time is now 13:10:00
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2016-08-25 13:10:05.143 INFO 31565 --- [pool-1-thread-1] hello.ScheduledTasks : The time is now 13:10:05
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2016-08-25 13:10:10.143 INFO 31565 --- [pool-1-thread-1] hello.ScheduledTasks : The time is now 13:10:10
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2016-08-25 13:10:15.143 INFO 31565 --- [pool-1-thread-1] hello.ScheduledTasks : The time is now 13:10:15
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....
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== Summary
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Congratulations! You created an application with a scheduled task. Heck, the actual code was shorter than the build file! This technique works in any type of application.
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== See Also
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The following guides may also be helpful:
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* https://spring.io/guides/gs/spring-boot/[Building an Application with Spring Boot]
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* https://spring.io/guides/gs/batch-processing/[Creating a Batch Service]
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include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/footer.adoc[]
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.baeldung</groupId>
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<artifactId>gs-scheduling-tasks</artifactId>
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<version>0.1.0</version>
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<name>gs-scheduling-tasks</name>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.1.6.RELEASE</version>
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</parent>
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<properties>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.awaitility</groupId>
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<artifactId>awaitility</artifactId>
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<version>3.1.2</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>
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package hello;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.scheduling.annotation.EnableScheduling;
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@SpringBootApplication
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@EnableScheduling
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public class Application {
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public static void main(String[] args) {
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SpringApplication.run(Application.class);
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}
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}
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/*
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* Copyright 2012-2015 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package hello;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.scheduling.annotation.Scheduled;
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import org.springframework.stereotype.Component;
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@Component
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public class ScheduledTasks {
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private static final Logger log = LoggerFactory.getLogger(ScheduledTasks.class);
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private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
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@Scheduled(fixedRate = 5000)
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public void reportCurrentTime() {
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log.info("The time is now {}", dateFormat.format(new Date()));
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}
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}
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