Use TestContainers for Gretty integration tests

samples/xml/redis/spring-session-sample-xml-redis.gradle

@@ -8,6 +8,7 @@ dependencies {
 	compile "org.webjars:webjars-taglib"
 	compile jstlDependencies
 	compile slf4jDependencies
+	compile "org.testcontainers:testcontainers"
 
 	providedCompile "javax.servlet:javax.servlet-api"
 
@@ -16,3 +17,7 @@ dependencies {
 
 	integrationTestCompile seleniumDependencies
 }
+
+gretty {
+	jvmArgs = ['-Dspring.profiles.active=embedded-redis']
+}

samples/xml/redis/src/main/java/sample/EmbeddedRedisConfig.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2014-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sample;
+
+import java.io.IOException;
+
+import org.testcontainers.containers.GenericContainer;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+import org.springframework.context.annotation.Profile;
+import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
+
+@Configuration
+@Profile("embedded-redis")
+public class EmbeddedRedisConfig {
+
+	private static final String REDIS_DOCKER_IMAGE = "redis:3.2.9";
+
+	@Bean(initMethod = "start")
+	public GenericContainer redisContainer() {
+		return new GenericContainer(REDIS_DOCKER_IMAGE) {
+
+			@Override
+			public void close() {
+				super.close();
+				try {
+					this.dockerClient.close();
+				}
+				catch (IOException ignored) {
+				}
+			}
+
+		}.withExposedPorts(6379);
+	}
+
+	@Bean
+	@Primary
+	public LettuceConnectionFactory redisConnectionFactory() {
+		return new LettuceConnectionFactory(redisContainer().getContainerIpAddress(),
+				redisContainer().getFirstMappedPort());
+	}
+
+}

samples/xml/redis/src/main/webapp/WEB-INF/spring/session.xml

@@ -15,4 +15,7 @@
 	<!--2-->
 	<bean class="org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory"/>
 	<!-- end::beans[] -->
-</beans>
+
+	<bean class="sample.EmbeddedRedisConfig"/>
+
+</beans>