[BAEL-7609] - Fixed spring-boot integration tests

spring-boot/src/main/java/com/baeldung/displayallbeans/controller/FooController.java

@@ -3,6 +3,7 @@ package com.baeldung.displayallbeans.controller;
 import java.util.Map;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 
@@ -14,9 +15,9 @@ public class FooController {
     private FooService fooService;
 
     @GetMapping(value = "/displayallbeans")
-    public String getHeaderAndBody(Map<String, Object> model) {
+    public ResponseEntity<String> getHeaderAndBody(Map<String, Object> model) {
         model.put("header", fooService.getHeader());
         model.put("message", fooService.getBody());
-        return "displayallbeans";
+        return ResponseEntity.ok("displayallbeans");
     }
 }