Improve development mode performance

Author: AB-xdev

vaadin-addon-template-demo/pom.xml

@@ -79,6 +79,12 @@
 			<groupId>com.vaadin</groupId>
 			<artifactId>vaadin-spring-boot-starter</artifactId>
 		</dependency>
+		<!-- Temporarily excluded by Vaadin due to "security vulnerability" -->
+		<dependency>
+			<groupId>org.yaml</groupId>
+			<artifactId>snakeyaml</artifactId>
+			<version>1.33</version>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-devtools</artifactId>

vaadin-addon-template-demo/src/main/resources/application.yml

@@ -0,0 +1,8 @@
+vaadin:
+  whitelisted-packages: software/xdev,com/vaadin/flow
+
+spring:
+  devtools:
+    restart:
+      poll-interval: 2s
+      quiet-period: 1s