Add jakarta-ee-11 module: Jakarta EE 10 vs 11 API comparison against Spring Boot 4.1.1

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Gth99spB1CzQmBFofXmU4Z

jakarta-ee-11/src/main/java/com/ankurm/jee11/Jee11Application.java

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+package com.ankurm.jee11;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Jee11Application {
+}

jakarta-ee-11/src/main/java/com/ankurm/jee11/ServletLevelController.java

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+package com.ankurm.jee11;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/** Asks the servlet container which Servlet specification level it implements. */
+@RestController
+class ServletLevelController {
+
+	@GetMapping("/servlet-level")
+	String level(HttpServletRequest request) {
+		var ctx = request.getServletContext();
+		return ctx.getMajorVersion() + "." + ctx.getMinorVersion() + " (container: " + ctx.getServerInfo() + ")";
+	}
+}

jakarta-ee-11/src/test/java/com/ankurm/jee11/ServletLevelTest.java

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+package com.ankurm.jee11;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.server.LocalServerPort;
+import org.springframework.web.client.RestClient;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+class ServletLevelTest {
+
+	@LocalServerPort
+	int port;
+
+	@Test
+	void containerReportsServlet61() throws IOException {
+		String body = RestClient.create("http://localhost:" + port).get().uri("/servlet-level").retrieve().body(String.class);
+		Files.createDirectories(Path.of("output"));
+		Files.write(Path.of("output/05-servlet-level.txt"), List.of(
+				"# 05-servlet-level  (Spring Boot 4.1.1, embedded Tomcat, JDK " + Runtime.version().feature() + ")",
+				"GET /servlet-level -> " + body));
+		assertThat(body).startsWith("6.1");
+	}
+}