Add gradle9 module: Spring Boot 4 build migrated from Gradle 8 to Gradle 9

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

gradle9/before/src/main/java/com/ankurm/g9/G9Application.java

@@ -0,0 +1,15 @@
+package com.ankurm.g9;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@SpringBootApplication
+@RestController
+public class G9Application {
+	public static void main(String[] args) { SpringApplication.run(G9Application.class, args); }
+
+	@GetMapping("/hello")
+	String hello() { return "hello"; }
+}

gradle9/before/src/test/java/com/ankurm/g9/G9ApplicationTest.java

@@ -0,0 +1,21 @@
+package com.ankurm.g9;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.webmvc.test.autoconfigure.AutoConfigureMockMvc;
+import org.springframework.test.web.servlet.MockMvc;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+class G9ApplicationTest {
+	@Autowired MockMvc mvc;
+
+	@Test
+	void hello() throws Exception {
+		mvc.perform(get("/hello")).andExpect(content().string("hello"));
+	}
+}