[JAVA] Create a Spring Boot application using IntelliJ IDEA
This is the procedure to create and execute a Spring Boot application using IntelliJ IDEA. Confirm that the execution can be executed by debugging with IntelliJ IDEA and building to a JAR file.
Development environment
- macOS Caralina 10.15.4
- OpenJDK 14.0.2
- maven 14.0.1
- IntelliJ IDEA
Advance preparation
Prepare the following for developing Spring Boot.
--Downloading and installing OpenJDK https://openjdk.java.net/
--Download and install Maven https://maven.apache.org/download.cgi
--Download and install IntelliJ IDEA https://www.jetbrains.com/ja-jp/idea/
--Check the path
- java -version
- mvn -v
Spring Boot development with IntelliJ IDEA
Create a project according to the contents of Getting Started of Spring Boot.
https://spring.pleiades.io/spring-boot/docs/current/reference/html/getting-started.html#getting-started-first-application
Follow the steps below.
--Creating a new project --Create pom.xml --Hello World! Creating an application --Run programs using IntelliJ IDEA --Build to jar file and execute
Create a new project
Launch IntelliJ IDEA and select "New Project".
Select "Maven", specify the OpenJDK installed in the "Project SDK", and then select "Next".
Enter a name for your project and select Finish.
Edit pom.xml
Describe the following contents in 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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>spring-boot-demo-app</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.2.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.3.2.RELEASE</version>
</plugin>
</plugins>
</build>
</project>
After editing pom.xml, reload the project.
Hello World! Creating an application
Create src / main / java / Example.java.
Describe the following contents in Example.java.
import org.springframework.boot.*;
import org.springframework.boot.autoconfigure.*;
import org.springframework.web.bind.annotation.*;
@RestController
@EnableAutoConfiguration
public class Example {
@RequestMapping("/")
String home() {
return "Hello World!";
}
public static void main(String[] args) {
SpringApplication.run(Example.class, args);
}
}
Run the program using IntelliJ IDEA
Let's run the created program. Execute the program by pressing the execute button displayed on the left of the main class.
If successful, you will see the following message on the console:
/Library/Java/JavaVirtualMachines/jdk-14.0.2.jdk/Contents/Home/bin/java -javaagent:/Applications/IntelliJ IDEA CE.app/Contents/lib/idea_rt.jar=52512:/Applications/IntelliJ IDEA CE.app/Contents/bin -Dfile.encoding=UTF-8 -classpath /Users/masayuki/Documents/program/spring-boot-demo-app/target/classes:/Users/masayuki/.m2/repository/org/springframework/boot/spring-boot-starter-web/2.3.2.RELEASE/spring-boot-starter-web-2.3.2.RELEASE.jar:/Users/masayuki/.m2/repository/org/springframework/boot/spring-boot-starter/2.3.2.RELEASE/spring-boot-starter-2.3.2.RELEASE.jar:/Users/masayuki/.m2/repository/org/springframework/boot/spring-boot/2.3.2.RELEASE/spring-boot-2.3.2.RELEASE.jar:/Users/masayuki/.m2/repository/org/springframework/boot/spring-boot-autoconfigure/2.3.2.RELEASE/spring-boot-autoconfigure-2.3.2.RELEASE.jar:/Users/masayuki/.m2/repository/org/springframework/boot/spring-boot-starter-logging/2.3.2.RELEASE/spring-boot-starter-logging-2.3.2.RELEASE.jar:/Users/masayuki/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar:/Users/masayuki/.m2/repository/ch/qos/logback/logback-core/1.2.3/logback-core-1.2.3.jar:/Users/masayuki/.m2/repository/org/slf4j/slf4j-api/1.7.30/slf4j-api-1.7.30.jar:/Users/masayuki/.m2/repository/org/apache/logging/log4j/log4j-to-slf4j/2.13.3/log4j-to-slf4j-2.13.3.jar:/Users/masayuki/.m2/repository/org/apache/logging/log4j/log4j-api/2.13.3/log4j-api-2.13.3.jar:/Users/masayuki/.m2/repository/org/slf4j/jul-to-slf4j/1.7.30/jul-to-slf4j-1.7.30.jar:/Users/masayuki/.m2/repository/jakarta/annotation/jakarta.annotation-api/1.3.5/jakarta.annotation-api-1.3.5.jar:/Users/masayuki/.m2/repository/org/springframework/spring-core/5.2.8.RELEASE/spring-core-5.2.8.RELEASE.jar:/Users/masayuki/.m2/repository/org/springframework/spring-jcl/5.2.8.RELEASE/spring-jcl-5.2.8.RELEASE.jar:/Users/masayuki/.m2/repository/org/yaml/snakeyaml/1.26/snakeyaml-1.26.jar:/Users/masayuki/.m2/repository/org/springframework/boot/spring-boot-starter-json/2.3.2.RELEASE/spring-boot-starter-json-2.3.2.RELEASE.jar:/Users/masayuki/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.11.1/jackson-databind-2.11.1.jar:/Users/masayuki/.m2/repository/com/fasterxml/jackson/core/jackson-annotations/2.11.1/jackson-annotations-2.11.1.jar:/Users/masayuki/.m2/repository/com/fasterxml/jackson/core/jackson-core/2.11.1/jackson-core-2.11.1.jar:/Users/masayuki/.m2/repository/com/fasterxml/jackson/datatype/jackson-datatype-jdk8/2.11.1/jackson-datatype-jdk8-2.11.1.jar:/Users/masayuki/.m2/repository/com/fasterxml/jackson/datatype/jackson-datatype-jsr310/2.11.1/jackson-datatype-jsr310-2.11.1.jar:/Users/masayuki/.m2/repository/com/fasterxml/jackson/module/jackson-module-parameter-names/2.11.1/jackson-module-parameter-names-2.11.1.jar:/Users/masayuki/.m2/repository/org/springframework/boot/spring-boot-starter-tomcat/2.3.2.RELEASE/spring-boot-starter-tomcat-2.3.2.RELEASE.jar:/Users/masayuki/.m2/repository/org/apache/tomcat/embed/tomcat-embed-core/9.0.37/tomcat-embed-core-9.0.37.jar:/Users/masayuki/.m2/repository/org/glassfish/jakarta.el/3.0.3/jakarta.el-3.0.3.jar:/Users/masayuki/.m2/repository/org/apache/tomcat/embed/tomcat-embed-websocket/9.0.37/tomcat-embed-websocket-9.0.37.jar:/Users/masayuki/.m2/repository/org/springframework/spring-web/5.2.8.RELEASE/spring-web-5.2.8.RELEASE.jar:/Users/masayuki/.m2/repository/org/springframework/spring-beans/5.2.8.RELEASE/spring-beans-5.2.8.RELEASE.jar:/Users/masayuki/.m2/repository/org/springframework/spring-webmvc/5.2.8.RELEASE/spring-webmvc-5.2.8.RELEASE.jar:/Users/masayuki/.m2/repository/org/springframework/spring-aop/5.2.8.RELEASE/spring-aop-5.2.8.RELEASE.jar:/Users/masayuki/.m2/repository/org/springframework/spring-context/5.2.8.RELEASE/spring-context-5.2.8.RELEASE.jar:/Users/masayuki/.m2/repository/org/springframework/spring-expression/5.2.8.RELEASE/spring-expression-5.2.8.RELEASE.jar Example
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.3.2.RELEASE)
2020-08-02 14:26:02.276 INFO 35892 --- [ main] Example : Starting Example on maa with PID 35892 (/Users/masayuki/Documents/program/spring-boot-demo-app/target/classes started by masayuki in /Users/masayuki/Documents/program/spring-boot-demo-app)
2020-08-02 14:26:02.280 INFO 35892 --- [ main] Example : No active profile set, falling back to default profiles: default
2020-08-02 14:26:04.567 INFO 35892 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-08-02 14:26:04.624 INFO 35892 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-08-02 14:26:04.625 INFO 35892 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.37]
2020-08-02 14:26:04.847 INFO 35892 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-08-02 14:26:04.848 INFO 35892 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2435 ms
2020-08-02 14:26:05.231 INFO 35892 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-08-02 14:26:05.676 INFO 35892 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-08-02 14:26:05.703 INFO 35892 --- [ main] Example : Started Example in 4.953 seconds (JVM running for 6.18)
If you access http: // localhost: 8080 with a browser in this state, Hello World! Will be displayed.
Build and run in jar file
From the tree that appears when you click Maven on the right, right-click Project Name> Lifecycle> package and then select Run Maven Build.
If the build is successful, the following message will be displayed on the console.
/Library/Java/JavaVirtualMachines/jdk-14.0.2.jdk/Contents/Home/bin/java -Dmaven.multiModuleProjectDirectory=/Users/masayuki/Documents/program/spring-boot-demo-app "-Dmaven.home=/Applications/IntelliJ IDEA CE.app/Contents/plugins/maven/lib/maven3" "-Dclassworlds.conf=/Applications/IntelliJ IDEA CE.app/Contents/plugins/maven/lib/maven3/bin/m2.conf" "-Dmaven.ext.class.path=/Applications/IntelliJ IDEA CE.app/Contents/plugins/maven/lib/maven-event-listener.jar" "-javaagent:/Applications/IntelliJ IDEA CE.app/Contents/lib/idea_rt.jar=52530:/Applications/IntelliJ IDEA CE.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath "/Applications/IntelliJ IDEA CE.app/Contents/plugins/maven/lib/maven3/boot/plexus-classworlds.license:/Applications/IntelliJ IDEA CE.app/Contents/plugins/maven/lib/maven3/boot/plexus-classworlds-2.6.0.jar" org.codehaus.classworlds.Launcher -Didea.version=2020.2 package
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------< org.example:spring-boot-demo-app >------------------
[INFO] Building spring-boot-demo-app 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) @ spring-boot-demo-app ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ spring-boot-demo-app ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to /Users/masayuki/Documents/program/spring-boot-demo-app/target/classes
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:testResources (default-testResources) @ spring-boot-demo-app ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /Users/masayuki/Documents/program/spring-boot-demo-app/src/test/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ spring-boot-demo-app ---
[INFO] Changes detected - recompiling the module!
[INFO]
[INFO] --- maven-surefire-plugin:2.22.2:test (default-test) @ spring-boot-demo-app ---
[INFO]
[INFO] --- maven-jar-plugin:3.2.0:jar (default-jar) @ spring-boot-demo-app ---
[INFO] Building jar: /Users/masayuki/Documents/program/spring-boot-demo-app/target/spring-boot-demo-app-1.0-SNAPSHOT.jar
[INFO]
[INFO] --- spring-boot-maven-plugin:2.3.2.RELEASE:repackage (repackage) @ spring-boot-demo-app ---
[INFO] Replacing main artifact with repackaged archive
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 9.498 s
[INFO] Finished at: 2020-08-02T14:27:21+09:00
[INFO] ------------------------------------------------------------------------
The console message when building says that [project root folder] / target / [project name] -1.0-SNAPSHOT.jar has been created, so look for the JAR file andjava -jar [created Start with the jar file]. If successful, you will see the following message on the console:
$ java -jar target/spring-boot-demo-app-1.0-SNAPSHOT.jar
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.3.2.RELEASE)
2020-08-02 14:27:49.758 INFO 35907 --- [ main] Example : Starting Example on maa with PID 35907 (/Users/masayuki/Documents/program/spring-boot-demo-app/target/spring-boot-demo-app-1.0-SNAPSHOT.jar started by masayuki in /Users/masayuki/Documents/program/spring-boot-demo-app)
2020-08-02 14:27:49.765 INFO 35907 --- [ main] Example : No active profile set, falling back to default profiles: default
2020-08-02 14:27:52.252 INFO 35907 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-08-02 14:27:52.306 INFO 35907 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-08-02 14:27:52.306 INFO 35907 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.37]
2020-08-02 14:27:52.528 INFO 35907 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-08-02 14:27:52.528 INFO 35907 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2622 ms
2020-08-02 14:27:53.043 INFO 35907 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-08-02 14:27:53.586 INFO 35907 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-08-02 14:27:53.613 INFO 35907 --- [ main] Example : Started Example in 5.628 seconds (JVM running for 6.985)
If you access http: // localhost: 8080 with a browser in this state, Hello World! Will be displayed.
So far, we have confirmed the execution and build of the Spring Boot application using IntelliJ IDEA.
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