{"id":97946,"date":"2019-09-10T19:00:21","date_gmt":"2019-09-10T16:00:21","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=97946"},"modified":"2019-09-09T10:35:36","modified_gmt":"2019-09-09T07:35:36","slug":"spring-boot-commandlinerunner-and-applicationrunner","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2019\/09\/spring-boot-commandlinerunner-and-applicationrunner.html","title":{"rendered":"Spring Boot CommandLineRunner and ApplicationRunner"},"content":{"rendered":"

In this quick tutorial, we\u2019ll explore the two very popular interfaces in Spring Boot: CommandLineRunner<\/em> and ApplicationRunner<\/em>.<\/p>\n

One common use case of these interfaces is to load some static data at application startup. Though, I have seen such usages mostly for test data setup only.<\/p>\n

Both of them are functional interfaces with a run()<\/em> method. This run()<\/em> method gets executed soon after the ApplicationContext<\/em> is loaded and before SpringApplication#run<\/em> method execution ends.<\/strong><\/p>\n

CommandLineRunner<\/em>:<\/h3>\n

We have access to the application arguments as a raw String <\/em>in the CommandLineRunner\u2019s run() <\/em>method.<\/strong><\/p>\n

Let\u2019s see that with the help of an example.<\/p>\n

Firstly, let\u2019s write a bean that implements the CommandLineRunner<\/em> interface:<\/p>\n

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\n\n\n\n
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01<\/div>\n
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\n
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@Component<\/code><\/div>\n
public<\/code> class<\/code> SampleCmdRunner <\/code>implements<\/code> CommandLineRunner {<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>private<\/code> static<\/code> final<\/code> Logger LOG = LoggerFactory.getLogger(SampleCmdRunner.<\/code>class<\/code>);<\/code><\/div>\n
   <\/code> <\/div>\n
    <\/code>@Override<\/code><\/div>\n
    <\/code>public<\/code> void<\/code> run(String[] args) {<\/code><\/div>\n
        <\/code>LOG.info(<\/code>\"Executing the command line runner, Application arguments: \"<\/code> + Arrays.toString(args));<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And now, let\u2019s bootstrap our Spring Boot application executable jar<\/em>:<\/p>\n

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1<\/div>\n<\/td>\n
\n
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java -jar SampleApp-<\/code>1.0<\/code>.jar parameter1 parameter2 parameter3<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Along with three command-line arguments: parameter1, parameter2, <\/em>and parameter3<\/em>.<\/p>\n

Our console logs would then be:<\/p>\n

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\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n<\/td>\n
\n
\n
s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): <\/code>8080<\/code> (http)<\/code><\/div>\n
Executing the command line runner, Application arguments: [parameter1, parameter2, parameter3]<\/code><\/div>\n
2019<\/code>-<\/code>09<\/code>-<\/code>02<\/code> 11<\/code>:<\/code>02<\/code>:<\/code>10.111<\/code>  INFO <\/code>7676<\/code> --- [main] com.programmergirl.SampleApp : Started SampleApp in <\/code>2.11<\/code> seconds<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Where all the provided arguments got listed.<\/p>\n

ApplicationRunner<\/em>:<\/h3>\n

Similarly, we can define beans that implement the ApplicationRunner<\/em> interface:<\/p>\n

\n
\n\n\n\n
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01<\/div>\n
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@Component<\/code><\/div>\n
public<\/code> class<\/code> SampleAppRunner <\/code>implements<\/code> ApplicationRunner {<\/code><\/div>\n
    <\/code> <\/div>\n
    <\/code>private<\/code> static<\/code> final<\/code> Logger LOG = LoggerFactory.getLogger(SampleAppRunner.<\/code>class<\/code>); <\/code><\/div>\n
    <\/code> <\/div>\n
    <\/code>@Override<\/code><\/div>\n
    <\/code>public<\/code> void<\/code> run(ApplicationArguments args) {<\/code><\/div>\n
        <\/code>LOG.info(<\/code>\"Executing SampleAppRunner\"<\/code>);<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/code> <\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

The ApplicationRunner<\/em> provides access to the ApplicationArguments<\/a><\/em>, not just the raw String<\/em> arguments. Rather, technically speaking, that\u2019s the only difference between them.<\/strong>

<\/div> <\/div><\/p>\n

How many ApplicationRunner<\/em> & CommandLineRunner<\/em> Implementations?<\/h3>\n

We are free to define any number of CommandLineRunner<\/em> and ApplicationRunner<\/em> implementations as we need.<\/p>\n

Java 8 Definitions:<\/h3>\n

With Java 8 lambda\u2019s, we can have a code:<\/strong><\/p>\n

\n
\n\n\n\n
\n
01<\/div>\n
02<\/div>\n
03<\/div>\n
04<\/div>\n
05<\/div>\n
06<\/div>\n
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\n
\n
@SpringBootApplication<\/code><\/div>\n
public<\/code> class<\/code> SampleApp {<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>public<\/code> static<\/code> void<\/code> main(String[] args) {<\/code><\/div>\n
        <\/code>SpringApplication.run(SampleApp.<\/code>class<\/code>, args);<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>@Bean<\/code><\/div>\n
    <\/code>CommandLineRunner commandLineRunner() {<\/code><\/div>\n
        <\/code>return<\/code> args -> <\/code><\/div>\n
          <\/code>System.out.println(<\/code>\"CommandLineRunner with args:\"<\/code><\/div>\n
            <\/code>+ Arrays.toString(args));<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>@Bean<\/code><\/div>\n
    <\/code>ApplicationRunner applicationRunner() {<\/code><\/div>\n
        <\/code>return<\/code> args -> <\/code><\/div>\n
          <\/code>System.out.println(<\/code>\"ApplicationRunner with args:\"<\/code><\/div>\n
            <\/code>+ Arrays.toString(args.getSourceArgs()))<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Which defines the implementation of these interfaces in our Application <\/i>class itself.<\/p>\n

Ordering:<\/h3>\n

We can also impose ordering on the execution of these beans using the @Order<\/em> annotation.<\/p>\n

Say, we have two CommandLineRunner<\/em> implementations:<\/p>\n

\n
\n\n\n\n
\n
01<\/div>\n
02<\/div>\n
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\n
\n
@Component<\/code><\/div>\n
@Order<\/code>(<\/code>1<\/code>)<\/code><\/div>\n
public<\/code> class<\/code> CmdRunner1 <\/code>implements<\/code> CommandLineRunner {<\/code><\/div>\n
    <\/code>private<\/code> static<\/code> final<\/code> Logger LOG = LoggerFactory.getLogger(CmdRunner1.<\/code>class<\/code>); <\/code><\/div>\n
    <\/code> <\/div>\n
    <\/code>@Override<\/code><\/div>\n
    <\/code>public<\/code> void<\/code> run(String[] args) {<\/code><\/div>\n
        <\/code>LOG.info(<\/code>\"In CmdRunner1\"<\/code>);<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
}<\/code><\/div>\n
 <\/code> <\/div>\n
@Component<\/code><\/div>\n
@Order<\/code>(<\/code>3<\/code>)<\/code><\/div>\n
public<\/code> class<\/code> CmdRunner2 <\/code>implements<\/code> CommandLineRunner {<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>private<\/code> static<\/code> final<\/code> Logger LOG = LoggerFactory.getLogger(CmdRunner2.<\/code>class<\/code>); <\/code><\/div>\n
    <\/code> <\/div>\n
    <\/code>@Override<\/code><\/div>\n
    <\/code>public<\/code> void<\/code> run(String[] args) {<\/code><\/div>\n
        <\/code>LOG.info(<\/code>\"In CmdRunner2\"<\/code>);    <\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Along with a class that implements the ApplicationRunner:<\/em><\/p>\n

\n
\n\n\n\n
\n
01<\/div>\n
02<\/div>\n
03<\/div>\n
04<\/div>\n
05<\/div>\n
06<\/div>\n
07<\/div>\n
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09<\/div>\n
10<\/div>\n<\/td>\n
\n
\n
@Component<\/code><\/div>\n
@Order<\/code>(<\/code>2<\/code>)<\/code><\/div>\n
public<\/code> class<\/code> AppRunner <\/code>implements<\/code> ApplicationRunner {<\/code><\/div>\n
    <\/code>private<\/code> static<\/code> final<\/code> Logger LOG = LoggerFactory.getLogger(AppRunner.<\/code>class<\/code>);<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>@Override<\/code><\/div>\n
    <\/code>public<\/code> void<\/code> run(ApplicationArguments args) {<\/code><\/div>\n
        <\/code>LOG.info(<\/code>\"In AppRunner\"<\/code>); <\/code><\/div>\n
    <\/code>} <\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Clearly, our CmdRunner1<\/em> will get executed first followed by the AppRunner<\/em> and finally the CmdRunner2.<\/em><\/p>\n

Conclusion:<\/h3>\n

In this tutorial, we talked about the CommandLineRunner<\/em> and ApplicationRunner<\/em> interfaces provided by Spring Boot.<\/p>\n

\n\n\n\n
\n

Published on Java Code Geeks with permission by Shubhra Srivastava, partner at our JCG program<\/a>. See the original article here: Spring Boot CommandLineRunner and ApplicationRunner<\/a><\/p>\n

Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

In this quick tutorial, we\u2019ll explore the two very popular interfaces in Spring Boot: CommandLineRunner and ApplicationRunner. One common use case of these interfaces is to load some static data at application startup. Though, I have seen such usages mostly for test data setup only. Both of them are functional interfaces with a run() method. …<\/p>\n","protected":false},"author":82253,"featured_media":240,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[854],"class_list":["post-97946","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-spring-boot"],"yoast_head":"\nSpring Boot CommandLineRunner and ApplicationRunner - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Interested to learn about CommandLineRunner? Check our article explaining about the CommandLineRunner and ApplicationRunner interfaces.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.javacodegeeks.com\/2019\/09\/spring-boot-commandlinerunner-and-applicationrunner.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spring Boot CommandLineRunner and ApplicationRunner - Java Code Geeks\" \/>\n<meta property=\"og:description\" content=\"Interested to learn about CommandLineRunner? 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