Migrated the following modules to parent-boot-2:

spring-reactor
spring-quartz

spring-reactor/pom.xml

@@ -27,7 +27,12 @@
         <dependency>
             <groupId>io.projectreactor</groupId>
             <artifactId>reactor-bus</artifactId>
+            <version>2.0.8.RELEASE</version>
+        </dependency>
+        <dependency>
+            <groupId>io.projectreactor</groupId>
+            <artifactId>reactor-core</artifactId>
+            <version>2.0.8.RELEASE</version>
         </dependency>
     </dependencies>
-
 </project>

spring-reactor/src/main/java/com/baeldung/controller/NotificationController.java

@@ -1,14 +1,16 @@
 package com.baeldung.controller;
 
-import com.baeldung.doman.NotificationData;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.doman.NotificationData;
+
 import reactor.bus.Event;
 import reactor.bus.EventBus;
 
-@Controller
+@RestController
 public class NotificationController {
 
     @Autowired