[JAVA] Deploy the WEB application by Spring Boot to Tomcat server as WAR

Premise

• AmazonLinux2(EC2)
• JDK1.8.0
• MySQL 8.0
• Configuration management is Gradle 6.0
• Here has already built an application server environment using EC2 and RDS. Initially, the EC2 instance was set to micro, but since the build failed due to lack of memory, it was set to medium.
• Here has Tomcat and JDK installed. This time, I don't use Apache and just use Tomcat for the time being.
• Clone the project from GitHub.

Added description for war deployment to the class that executes Spring

• When I create a project, I think that a class that automatically executes Spring is created (class with @SpringBootApplication annotation).
• Here is a description to make it deployable as war. See Spring Official.

@SpringBootApplication
public class Application extends SpringBootServletInitializer {

	@Override
	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
		return application.sources(Application.class);
	}

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

}

Gradle settings and build

Gradle settings

• Make settings for creating a war. ʻArchiveName` is the name of war.
• SpringBoot embedded Tomcat is set so that it does not conflict with the one on EC2
• In addition, in my case, I also included the screen test code by Selenied in the project, so I wrote the setting to exclude this in test.

plugins {
	id 'org.springframework.boot' version '2.2.4.RELEASE'
	id 'io.spring.dependency-management' version '1.0.9.RELEASE'
	id 'java'
	id 'war'
}

// ~abridgement~

war {
    enabled = true
    archiveName = 'sample.war'
}

dependencies {
	// ~abridgement~
	providedRuntime 'org.springframework.boot:spring-boot-starter-tomcat'
}

test {
	// ~abridgement~
	exclude 'com/example/demo/ViewTest.class'
}

Build on EC2

• git clone the WEB application project in your home directory.
• Reflect the RDS settings in application.properties in the project.

Project application.In the directory with properties

$ sudo vim application.properties

application.properties

spring.datasource.url=jdbc:mysql://RDS endpoint:3306/Database name?serverTimezone=JST
spring.datasource.username=******
spring.datasource.password=***********
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.open-in-view=true
#~abridgement~

• Execute gradlew build command. If build is successful, sample.war will be generated in project name / build / libs.
• Although I don't know yet, a war named project name -0.0.1-SNAPSHOT.war was also generated (is the content the same as sample.war?).

In the project directory

$ ./gradlew build

Deploy the generated war to tomcat

• Copy sample.war under tomcat / webapps. * In my case, deploy to / opt / tomcat-9 / webapps.

$ cp sample.war /opt/tomcat-9/webapps/

• Restart Tomcat

$ sudo systemctl restart tomcat

If you access it like ↓, the app will run. http://EC2のエンドポイント:8080/sample/作成アプリに応じたリクエスト先