Polish @IntegrationComponentScan auto-configuration

See gh-2037
See gh-7718

spring-boot-samples/spring-boot-sample-integration/src/main/java/sample/integration/SampleCommandLineRunner.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2012-2016 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.integration;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+@Component
+public class SampleCommandLineRunner implements CommandLineRunner {
+
+	private final SampleMessageGateway gateway;
+
+	public SampleCommandLineRunner(SampleMessageGateway gateway) {
+		this.gateway = gateway;
+	}
+
+	@Override
+	public void run(String... args) throws Exception {
+		for (String arg : args) {
+			this.gateway.echo(arg);
+		}
+	}
+
+}

spring-boot-samples/spring-boot-sample-integration/src/main/java/sample/integration/SampleMessageGateway.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2012-2016 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.integration;
+
+import org.springframework.integration.annotation.MessagingGateway;
+
+@MessagingGateway(defaultRequestChannel = "outputChannel")
+public interface SampleMessageGateway {
+
+	void echo(String message);
+
+}