Implement remainder of Spring Boot Checkstyle code rules

Fixes #532

Implements most of the remaining rules from Spring Boot, except JavaDoc + a few additional ones

spring-cloud-stream-integration-tests/src/test/java/org/springframework/cloud/stream/config/ContentTypeOutboundSourceTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.cloud.stream.config;
 
 import org.junit.Test;
@@ -42,16 +43,19 @@ import static org.junit.Assert.assertThat;
 @SpringApplicationConfiguration({ContentTypeOutboundSourceTests.TestSource.class})
 public class ContentTypeOutboundSourceTests {
 
-	@Autowired @Bindings(TestSource.class)
+	@Autowired
+	@Bindings(TestSource.class)
 	private Source testSource;
 
 	@Autowired
 	private BinderFactory binderFactory;
 
 	@Test
+	@SuppressWarnings("unchecked")
 	public void testMessageHeaderWhenNoExplicitContentTypeOnMessage() throws Exception {
 		testSource.output().send(MessageBuilder.withPayload("{\"message\":\"Hi\"}").build());
-		Message<String> received = (Message<String>) ((TestSupportBinder) binderFactory.getBinder(null)).messageCollector().forChannel(testSource.output()).poll();
+		Message<String> received = (Message<String>) ((TestSupportBinder) binderFactory.getBinder(null))
+				.messageCollector().forChannel(testSource.output()).poll();
 		assertThat(received.getHeaders().get(MessageHeaders.CONTENT_TYPE).toString(), equalTo("application/json"));
 		assertThat(received.getPayload(), equalTo("{\"message\":\"Hi\"}"));
 	}

spring-cloud-stream-integration-tests/src/test/java/org/springframework/cloud/stream/config/CustomMessageConverterTests.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2015 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 org.springframework.cloud.stream.config;
 
 import java.util.List;
@@ -39,7 +55,8 @@ import static org.junit.Assert.assertTrue;
 @SpringApplicationConfiguration(CustomMessageConverterTests.TestSource.class)
 public class CustomMessageConverterTests {
 
-	@Autowired @Bindings(TestSource.class)
+	@Autowired
+	@Bindings(TestSource.class)
 	private Source testSource;
 
 	@Autowired

spring-cloud-stream-integration-tests/src/test/java/org/springframework/cloud/stream/config/ErrorChannelTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.cloud.stream.config;
 
 import java.util.concurrent.TimeUnit;
@@ -54,7 +55,7 @@ public class ErrorChannelTests {
 
 	@Test
 	public void testErrorChannelBinding() throws Exception {
-		Message<?> message = (Message<?>) ((TestSupportBinder) binderFactory.getBinder(null)).messageCollector().forChannel(errorChannel).poll(10, TimeUnit.SECONDS);
+		Message<?> message = ((TestSupportBinder) binderFactory.getBinder(null)).messageCollector().forChannel(errorChannel).poll(10, TimeUnit.SECONDS);
 		Assert.isTrue(message instanceof ErrorMessage, "Message should be an instance of ErrorMessage");
 		Assert.isTrue(message.getPayload() instanceof MessagingException, "Message payload should be an instance" +
 				"of MessagingException");

spring-cloud-stream-integration-tests/src/test/java/org/springframework/cloud/stream/config/MessageChannelConfigurerTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.cloud.stream.config;
 
 import java.util.List;
@@ -54,7 +55,8 @@ import static org.junit.Assert.assertTrue;
 @SpringApplicationConfiguration({MessageChannelConfigurerTests.TestSink.class})
 public class MessageChannelConfigurerTests {
 
-	@Autowired @Bindings(TestSink.class)
+	@Autowired
+	@Bindings(TestSink.class)
 	private Sink testSink;
 
 	@Autowired
@@ -95,7 +97,7 @@ public class MessageChannelConfigurerTests {
 			assertTrue(objectMapper == this.objectMapper);
 		}
 	}
-	
+
 	@EnableBinding(Sink.class)
 	@EnableAutoConfiguration
 	@PropertySource("classpath:/org/springframework/cloud/stream/config/channel/sink-channel-configurers.properties")