1 . SpringBootServletInitializer 추가

다음과 같은 형식으로 변경

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

@SpringBootApplication
public class Application extends SpringBootServletInitializer {

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

	protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
		return builder.sources(Application.class);
	}
}

2. build.gradle 변경

id 'war' 추가

plugins {
	id 'org.springframework.boot' version '2.7.0'
	id 'io.spring.dependency-management' version '1.0.11.RELEASE'
	id 'java'
	id 'eclipse'
	id 'war'
}

war 플러그인 추가

apply plugin:'war'

bootWar 추가

bootWar {
	archiveName 'ROOT.war'
	archiveBaseName = "ROOT"
	archiveFileName = "ROOT.war"
	archiveVersion	= "0.0.0"
}

spring-boot-starter-tomcat 추가

	providedRuntime 'org.springframework.boot:spring-boot-starter-tomcat'

build.gradle  전체 샘플  예

plugins {
	id 'org.springframework.boot' version '2.7.5'
	id 'io.spring.dependency-management' version '1.0.11.RELEASE'
	id 'java'
	id 'eclipse'
	id 'war'
}

group = 'com.sample'
version = '0.0.1-SNAPSHOT'
apply plugin:'war'
sourceCompatibility = '11'

configurations {
	compileOnly {
		extendsFrom annotationProcessor
	}
}

repositories {
	mavenCentral()
}


bootWar {
	archiveName 'ROOT.war'
	archiveBaseName = "ROOT"
	archiveFileName = "ROOT.war"
	archiveVersion	= "0.0.0"
}
dependencies {
	implementation 'org.springframework.boot:spring-boot-starter-web'
	implementation 'org.mybatis.spring.boot:mybatis-spring-boot-starter:2.2.2'
	compileOnly 'org.projectlombok:lombok'
	developmentOnly 'org.springframework.boot:spring-boot-devtools'
	runtimeOnly 'mysql:mysql-connector-java'
	annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor'
	annotationProcessor 'org.projectlombok:lombok'
	testImplementation 'org.springframework.boot:spring-boot-starter-test'
	implementation 'org.apache.tomcat.embed:tomcat-embed-jasper'
	implementation 'javax.servlet:jstl:1.2'	
	implementation 'org.jsoup:jsoup:1.15.1'	
	implementation group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.12.4'
	implementation 'org.bgee.log4jdbc-log4j2:log4jdbc-log4j2-jdbc4.1:1.16'
	providedRuntime 'org.springframework.boot:spring-boot-starter-tomcat'
}

tasks.named('test') {
	useJUnitPlatform()
}

3.  Gradle Tasks 메뉴 에서 bootWar 를 클릭해서  빌드

Navigator 메뉴와 Gradle Tasks 메뉴가 없다면

window -> show view  에서 Navigator 메뉴와 Gradle Tasks 를 연다.

Gradle Tasks 메뉴 에서 bootWar 를 클릭

Navigator  에서   build -> libs  디렉토리에 빌드된 ROOT.war 파일이 생성 된다.