Spring Boot - Creating a simple web application

Following are the steps to engender a simple Spring Boot Project.

Step 1: 

Open the Spring initializr https://start.spring.io/

Step 2: 

Provide the Group and Artifact name. We have provided Group name com.knowledgefactory and Artifact spring boot-demo.

Here I selected the Maven project - language Java - Spring Boot 2.3.8

And integrated Spring web dependency. The single spring-boot-starter-web dependency transitively pulls in all dependencies cognate to web development.




Step 3: 

Click on the Generate button. When we click on the Generate button, it starts packing the project in a .zip(spring boot-demo.zip) file and downloads the project.

Step 4:

Extract the Zip file

Step 5:

Import the project

File -> Import -> Maven ->Existing Maven Project -> Next -> Browse -> Select the project -> Finish

When the project imports prosperously, we can optically discern the project directory in the Package Explorer. The following image shows the project directory:



SpringbootDemoApplication.java
package com.knowledgefactory.springbootdemo;

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

@SpringBootApplication
public class SpringbootDemoApplication {

   public static void main(String[] args) {
      SpringApplication.run(SpringbootDemoApplication.class, args);
   }

}

Pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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 
                       https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.8.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.knowledgefactory</groupId>
    <artifactId>springboot-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

Step 6:

Right-click on the springboot-demo project -> Run As -> Spring Boot App

Console Output:

OpenJDK 64-Bit Server VM warning: Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.1.RELEASE)

2021-02-02 21:46:33.887  INFO 11307 --- [           main] c.k.s.SpringbootDemoApplication          : Starting SpringbootDemoApplication on ladmin-H310M-S2 with PID 11307 (/home/sibinmuhammed/Downloads/springboot-demo/target/classes started by sibinmuhammed in /home/sibinmuhammed/Downloads/springboot-demo)
2021-02-02 21:46:33.897  INFO 11307 --- [           main] c.k.s.SpringbootDemoApplication          : No active profile set, falling back to default profiles: default
2021-02-02 21:46:34.952  INFO 11307 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2021-02-02 21:46:34.990  INFO 11307 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2021-02-02 21:46:34.990  INFO 11307 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/9.0.13
2021-02-02 21:46:34.994  INFO 11307 --- [           main] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/usr/java/packages/lib:/usr/lib64:/lib64:/lib:/usr/lib]
2021-02-02 21:46:35.052  INFO 11307 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2021-02-02 21:46:35.052  INFO 11307 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1075 ms
2021-02-02 21:46:35.170  INFO 11307 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2021-02-02 21:46:35.260  INFO 11307 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2021-02-02 21:46:35.262  INFO 11307 --- [           main] c.k.s.SpringbootDemoApplication          : Started SpringbootDemoApplication in 1.948 seconds (JVM running for 2.848)

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