Spring Boot Hello world StandAlone application

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In this post, we are going to create Spring Boot Hello world StandAlone application. We have already created Spring boot web hello world example.

It is very easy to configure Spring standalone project using Spring boot.

Github Source code:

Project Structure:

Spring Boot standalone project structure

 

Step 1:  Create a simple java  project using maven in eclipse named “SpringBootHelloWorldStandaloneExample”.
Step 2: Change “pom.xml” as below:

Step 3: Create a file named “Country.java” in package .org.arpit.java2blog.springboot

If you notice, we are using @Value(“${countryName}”) for countryName attribute.Actually, this syntax is used to read a String from the property file. In the next step, we will put “countryName=India” in application.properties. We have declared this bean with @Component annotation, so spring boot will automatically find this bean using component scan.
Step 4: Create a file named “application.properties” in package src/main/resources

Step 5: Create a file named “SpringBootHelloWorldStandaloneApplication.java” in package .org.arpit.java2blog

You can read more about @Autowire and @Qualifier.

The SpringBootHelloWorldStandaloneApplication’s main method uses Spring Boot’s pringApplication.run() method to launch a spring application.If you notice, we did not do any single line of xml configuration here.

We have implemented CommandLineRunner interface here. This interface indicates that bean should run if it is contained in spring application.
When you run above application, you will get below output.

2017-05-06 00:12:49.911 INFO 15824 — [ main] pringBootHelloWorldStandaloneApplication : Starting SpringBootHelloWorldStandaloneApplication on apples-MacBook-Air.local with PID 15824 (/Users/apple/Documents/WorkspaceAlgo/SpringBootHelloWorldStandaloneExample/target/classes started by apple in /Users/apple/Documents/WorkspaceAlgo/SpringBootHelloWorldStandaloneExample)
2017-05-06 00:12:49.914 INFO 15824 — [ main] pringBootHelloWorldStandaloneApplication : No active profile set, falling back to default profiles: default
2017-05-06 00:12:50.012 INFO 15824 — [ main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@5579bb86: startup date [Sat May 06 00:12:50 IST 2017]; root of context hierarchy
2017-05-06 00:12:50.817 INFO 15824 — [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
Country Name: India
2017-05-06 00:12:50.838 INFO 15824 — [ main] pringBootHelloWorldStandaloneApplication : Started SpringBootHelloWorldStandaloneApplication in 1.421 seconds (JVM running for 2.006)
2017-05-06 00:12:50.839 INFO 15824 — [ Thread-2] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@5579bb86: startup date [Sat May 06 00:12:50 IST 2017]; root of context hierarchy
2017-05-06 00:12:50.841 INFO 15824 — [ Thread-2] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown

That’s all about Spring Boot Hello world StandAlone application.

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