spring-boot/spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/spring-boot-server-tests-app/build.gradle

import org.springframework.boot.gradle.tasks.bundling.BootJar
import org.springframework.boot.gradle.tasks.bundling.BootWar

plugins {
	id "java"
	id "org.springframework.boot"
	id "war"
}

apply plugin: "io.spring.dependency-management"

repositories {
	maven { url "file:${rootDir}/../test-repository"}
	mavenCentral()
	maven { 
		url "https://repo.spring.io/milestone"
		content {
			excludeGroup "org.springframework.boot"
		}
	}
	maven { 
		url "https://repo.spring.io/snapshot"
		content {
			excludeGroup "org.springframework.boot"
		}
	}
}

configurations {
	jetty
	tomcat
	undertow
}

tasks.register("resourcesJar", Jar) { jar -> 
	def nested = project.resources.text.fromString("nested")
	from(nested) {
		into "META-INF/resources/"
		rename (".*", "nested-meta-inf-resource.txt")
	}
	if (!isWindows()) {
		def encodedName = project.resources.text.fromString("encoded-name")
		from(encodedName) {
			into "META-INF/resources/"
			rename (".*", 'nested-reserved-!#\\$%&()*+,:=?@[]-meta-inf-resource.txt')
		}
	}
	classifier = 'resources'
}

dependencies {
	compileOnly("org.eclipse.jetty:jetty-server")

	implementation("org.springframework.boot:spring-boot-starter")
	implementation("org.springframework:spring-web")

	jetty("org.springframework.boot:spring-boot-starter-jetty")
	jetty files(resourcesJar)
	tomcat("org.springframework.boot:spring-boot-starter-tomcat")
	tomcat files(resourcesJar)
	undertow("org.springframework.boot:spring-boot-starter-undertow")
	undertow files(resourcesJar)
}

def boolean isWindows() {
	return File.separatorChar == '\\';
}

["jetty", "tomcat", "undertow"].each { container ->
	def configurer = { task -> 
		task.dependsOn resourcesJar
		task.mainClass = "com.example.ResourceHandlingApplication"
		task.classpath = sourceSets.main.runtimeClasspath.plus(configurations.getByName(container))
		task.classifier = container
	}
	tasks.register("${container}BootJar", BootJar, configurer)
	tasks.register("${container}BootWar", BootWar, configurer)
}