migrated modules to parent-boot-2 with spring-boot 2.1:

spring-session/spring-session-jdbc
spring-vault
spring-webflux-amqp
vaadin
vavr

vaadin/pom.xml

@@ -10,10 +10,10 @@
     <name>Vaadin</name>
 
     <parent>
-        <artifactId>parent-boot-2.0-temp</artifactId>
+        <artifactId>parent-boot-2</artifactId>
         <groupId>com.baeldung</groupId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../parent-boot-2.0-temp</relativePath>
+        <relativePath>../parent-boot-2</relativePath>
     </parent>
     
     <dependencyManagement>

vaadin/src/main/resources/application.properties

@@ -0,0 +1,2 @@
+#Vaadin supports spring-boot 2.1 properly from V8 onwards (according to this comment https://github.com/vaadin/spring/issues/331#issuecomment-435128475)
+spring.main.allow-bean-definition-overriding=true