Add DemoController

Change-Id: Id31631f48ebf0e61e62ff827c4eff8d5d8ba792b

java-spring-boot-demo/src/main/java/com/example/demo/DemoController.java

@@ -0,0 +1,14 @@
+package com.example.demo;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class DemoController {
+
+    @RequestMapping("/")
+    public Object root() {
+        return null;
+    }
+
+}