diff --git a/spring-cloud-gateway-sample/pom.xml b/spring-cloud-gateway-sample/pom.xml
index a8f72d13..5d634759 100644
--- a/spring-cloud-gateway-sample/pom.xml
+++ b/spring-cloud-gateway-sample/pom.xml
@@ -11,7 +11,6 @@
 	<description>Spring Cloud Gateway Sample</description>
 
 	<properties>
-		<kotlin.version>1.1.51</kotlin.version>
 	</properties>
 
 	<parent>
@@ -57,26 +56,27 @@
 		<dependency>
 			<groupId>org.jetbrains.kotlin</groupId>
 			<artifactId>kotlin-stdlib</artifactId>
-			<version>${kotlin.version}</version>
 			<optional>true</optional>
 		</dependency>
 		<dependency>
 			<groupId>org.jetbrains.kotlin</groupId>
 			<artifactId>kotlin-reflect</artifactId>
-			<version>${kotlin.version}</version>
 			<optional>true</optional>
 		</dependency>
 	</dependencies>
 	<build>
 		<plugins>
 			<plugin>
-				<artifactId>kotlin-maven-plugin</artifactId>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>			
+			<plugin>
 				<groupId>org.jetbrains.kotlin</groupId>
-				<version>${kotlin.version}</version>
+				<artifactId>kotlin-maven-plugin</artifactId>
 				<configuration>
-					<compilerPlugins>
-						<plugin>spring</plugin>
-					</compilerPlugins>
+					<args>
+						<arg>-Xjsr305=strict</arg>
+					</args>
 					<jvmTarget>1.8</jvmTarget>
 				</configuration>
 				<executions>
@@ -107,13 +107,6 @@
 						</configuration>
 					</execution>
 				</executions>
-				<dependencies>
-					<dependency>
-						<groupId>org.jetbrains.kotlin</groupId>
-						<artifactId>kotlin-maven-allopen</artifactId>
-						<version>${kotlin.version}</version>
-					</dependency>
-				</dependencies>
 			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
diff --git a/spring-cloud-gateway-sample/src/main/kotlin/org/springframework/cloud/gateway/sample/AdditionalRoutes.kt b/spring-cloud-gateway-sample/src/main/kotlin/org/springframework/cloud/gateway/sample/AdditionalRoutes.kt
index 96ac87df..e24f4715 100644
--- a/spring-cloud-gateway-sample/src/main/kotlin/org/springframework/cloud/gateway/sample/AdditionalRoutes.kt
+++ b/spring-cloud-gateway-sample/src/main/kotlin/org/springframework/cloud/gateway/sample/AdditionalRoutes.kt
@@ -1,6 +1,5 @@
 package org.springframework.cloud.gateway.sample
 
-import org.springframework.cloud.gateway.route.RouteLocator
 import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder
 import org.springframework.cloud.gateway.route.builder.filters
 import org.springframework.cloud.gateway.route.builder.routes
@@ -8,10 +7,10 @@ import org.springframework.context.annotation.Bean
 import org.springframework.context.annotation.Configuration
 
 @Configuration
-class AdditionalRoutes {
+open class AdditionalRoutes {
 
 	@Bean
-	fun additionalRouteLocator(builder: RouteLocatorBuilder): RouteLocator = builder.routes {
+	open fun additionalRouteLocator(builder: RouteLocatorBuilder) = builder.routes {
 		route(id = "test-kotlin") {
 			host("kotlin.abc.org") and path("/image/png")
 			filters {