Minimize dependencies of launch script test app

Closes gh-28164

spring-boot-tests/spring-boot-integration-tests/spring-boot-launch-script-tests/build.gradle

@@ -17,7 +17,6 @@ configurations {
 dependencies {
 	app project(path: ":spring-boot-project:spring-boot-dependencies", configuration: "mavenRepository")
 	app project(path: ":spring-boot-project:spring-boot-parent", configuration: "mavenRepository")
-	app project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-web", configuration: "mavenRepository")
 	app project(path: ":spring-boot-project:spring-boot-tools:spring-boot-gradle-plugin", configuration: "mavenRepository")
 
 	intTestImplementation(enforcedPlatform(project(":spring-boot-project:spring-boot-parent")))

spring-boot-tests/spring-boot-integration-tests/spring-boot-launch-script-tests/spring-boot-launch-script-tests-app/build.gradle

@@ -13,7 +13,7 @@ repositories {
 }
 
 dependencies {
-	implementation("org.springframework.boot:spring-boot-starter-web")
+	implementation("org.apache.tomcat.embed:tomcat-embed-core")
 }
 
 bootJar {

spring-boot-tests/spring-boot-integration-tests/spring-boot-launch-script-tests/spring-boot-launch-script-tests-app/src/main/java/org/springframework/boot/launchscript/LaunchScriptTestApplication.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,14 +16,73 @@
 
 package org.springframework.boot.launchscript;
 
-import org.springframework.boot.SpringApplication;
+import java.io.IOException;
-import org.springframework.boot.autoconfigure.SpringBootApplication;
+import java.net.URL;
+import java.security.CodeSource;
+import java.security.ProtectionDomain;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.catalina.Context;
+import org.apache.catalina.LifecycleException;
+import org.apache.catalina.startup.Tomcat;
 
-@SpringBootApplication
 public class LaunchScriptTestApplication {
 
-	public static void main(String[] args) {
+	public static void main(String[] args) throws LifecycleException {
-		SpringApplication.run(LaunchScriptTestApplication.class, args);
+		System.out.println("Starting " + LaunchScriptTestApplication.class.getSimpleName() + " (" + findSource() + ")");
+		Tomcat tomcat = new Tomcat();
+		tomcat.getConnector().setPort(getPort(args));
+		Context context = tomcat.addContext(getContextPath(args), null);
+		tomcat.addServlet(context.getPath(), "test", new HttpServlet() {
+
+			@Override
+			protected void doGet(HttpServletRequest req, HttpServletResponse resp)
+					throws ServletException, IOException {
+				resp.getWriter().println("Launched");
+			}
+
+		});
+		context.addServletMappingDecoded("/", "test");
+		tomcat.start();
+	}
+
+	private static URL findSource() {
+		try {
+			ProtectionDomain domain = LaunchScriptTestApplication.class.getProtectionDomain();
+			CodeSource codeSource = (domain != null) ? domain.getCodeSource() : null;
+			return (codeSource != null) ? codeSource.getLocation() : null;
+		}
+		catch (Exception ex) {
+		}
+		return null;
+	}
+
+	private static int getPort(String[] args) {
+		String port = getProperty(args, "server.port");
+		return (port != null) ? Integer.parseInt(port) : 8080;
+	}
+
+	private static String getContextPath(String[] args) {
+		String contextPath = getProperty(args, "server.servlet.context-path");
+		return (contextPath != null) ? contextPath : "";
+	}
+
+	private static String getProperty(String[] args, String property) {
+		String value = System.getProperty(property);
+		if (value != null) {
+			return value;
+		}
+		String prefix = "--" + property + "=";
+		for (String arg : args) {
+			if (arg.startsWith(prefix)) {
+				return arg.substring(prefix.length());
+			}
+		}
+		return null;
 	}
 
 }

spring-boot-tests/spring-boot-integration-tests/spring-boot-launch-script-tests/spring-boot-launch-script-tests-app/src/main/java/org/springframework/boot/launchscript/LaunchVerificationController.java

@@ -1,30 +0,0 @@
-/*
- * Copyright 2012-2020 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.boot.launchscript;
-
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
-
-@RestController
-public class LaunchVerificationController {
-
-	@RequestMapping("/")
-	public String verifyLaunch() {
-		return "Launched\n";
-	}
-
-}