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Create a basic java spring boot application

This is a basic example for beginners for creating a basic java spring boot application using ‘spring-boot-starter-parent’.

In this tutorial I am using Spring tool suite as my IDE.

Step I. Create a Maven project

I.1:  File->New -> Maven Project (You can do it by write clicking in the blank space of Package Explorer )

I.2: I have selected ‘create a simple project ( skip archetye selection)’ this allow me to kip the Archetype selection

I.3 : Setting group id and artifact id and other project related details

Done with the maven project creation, you can see the IDE automatically create the project folder structure like bellow .

You can see the project details in pom.xml file

 

Add the spring boot dependency

<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/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.mytutor</groupId>
	<artifactId>my-project</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>My Project</name>
	<description>some description</description>

	<properties>
		<java.version>1.8</java.version> <!-- Setting java version -->
	</properties>
	
	<parent> <!-- here we are saying our project is a child of the  spring-boot-starter-parent project -->
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.3.RELEASE</version>
	</parent>

	<dependencies>
		<dependency> <!-- Adding spring boot dependency -->
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		
         </dependencies>

</project>
Update the project

write click on project folder->Maven->Update Project

After update we can see JRe updated to 1.8 and added Maven Dependencies

 

Now we can create our application entry point

Crate a class like bellow (sselect the tic ‘public static void main’ to auto generate the function)

Right click in Package Explorer -> New ->Class

Then add @SpringBootApplication annotation to the class and add SpringApplication.run(MyApp.class, args); inside the main function

package com.mytutor;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MyApp {

	
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		SpringApplication.run(MyApp.class, args);
	}

}

Now we can create our controller 

Right click in Package Explorer -> New ->Class

 

Add the following code in the file

package com.mytutor.controllers;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class MyFirstController {
	
	@RequestMapping("/home")     //Request mapping https://localhost/home
    String myHome() {
        return "Hello World!";
    }

}

You are done

Now we can run our application You can press the Green *Play button    Or  you can right click the project folder and select the Run As – >Java Application

Tadaaaaa! Our project is running

Now we can hit the url

We and run Spring boot application from command line also by using the command  mvn spring-boot:run

 

Done


Note

If you are getting the error “Exception in thread “main” java.lang.NoClassDefFoundError: ch/qos/logback/classic/turbo/TurboFilter ” please add the logback-classic dependency in pom file

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		
		<!-- Exception in thread "main" java.lang.NoClassDefFoundError: ch/qos/logback/classic/turbo/TurboFilter  -->
		<!-- https://mvnrepository.com/artifact/ch.qos.logback/logback-classic -->
		<dependency>
		    <groupId>ch.qos.logback</groupId>
		    <artifactId>logback-classic</artifactId>
		    <version>1.2.3</version>
		    <scope>test</scope>
		</dependency>

	</dependencies>

 

By bm on July 19, 2017 | Java, Spring boot | A comment?
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