Resolves checkstyle errors for eip-* (#1069)

* Reduces checkstyle errors in eip-aggregator

* Reduces checkstyle errors in eip-message-channel

* Reduces checkstyle errors in eip-publish-subscribe

* Reduces checkstyle errors in eip-splitter

* Reduces checkstyle errors in eip-wire-tap

eip-aggregator/src/main/java/com/iluwatar/eip/aggregator/App.java

@@ -30,21 +30,20 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.ConfigurableApplicationContext;
 
 /**
- * Sometimes in enterprise systems there is a need to group incoming data in order to process it as a whole. For example
+ * Sometimes in enterprise systems there is a need to group incoming data in order to process it as
- * you may need to gather offers and after defined number of offers has been received you would like to choose the one
+ * a whole. For example you may need to gather offers and after defined number of offers has been
- * with the best parameters.
+ * received you would like to choose the one with the best parameters.
- *
- * <p>
- * Aggregator allows you to merge messages based on defined criteria and parameters. It gathers original messages,
- * applies aggregation strategy and upon fulfilling given criteria, releasing merged messages.
- * </p>
  *
+ * <p>Aggregator allows you to merge messages based on defined criteria and parameters. It gathers
+ * original messages, applies aggregation strategy and upon fulfilling given criteria, releasing
+ * merged messages.
  */
 @SpringBootApplication
 public class App {
 
   /**
-   * Program entry point. It starts Spring Boot application and using Apache Camel it auto-configures routes.
+   * Program entry point. It starts Spring Boot application and using Apache Camel it
+   * auto-configures routes.
    *
    * @param args command line args
    */

eip-aggregator/src/main/java/com/iluwatar/eip/aggregator/routes/AggregatorRoute.java

@@ -30,16 +30,15 @@ import org.springframework.stereotype.Component;
 /**
  * Sample aggregator route definition.
  *
- * <p>
+ * <p>It consumes messages out of the <i>direct:entry</i> entry point and forwards them to
- * It consumes messages out of the <i>direct:entry</i> entry point and forwards them to <i>direct:endpoint</i>.
+ * <i>direct:endpoint</i>. Route accepts messages containing String as a body, it aggregates the
- * Route accepts messages containing String as a body, it aggregates the messages based on the settings and forwards
+ * messages based on the settings and forwards them as CSV to the output chanel.
- * them as CSV to the output chanel.
  *
- * Settings for the aggregation are: aggregate until 3 messages are bundled or wait 2000ms before sending bundled
+ * <p>Settings for the aggregation are: aggregate until 3 messages are bundled or wait 2000ms
- * messages further.
+ * before sending bundled messages further.
- * </p>
  *
- * In this example input/output endpoints names are stored in <i>application.properties</i> file.
+ * <p>In this example input/output endpoints names are stored in <i>application.properties</i>
+ * file.
  */
 @Component
 public class AggregatorRoute extends RouteBuilder {
@@ -48,7 +47,8 @@ public class AggregatorRoute extends RouteBuilder {
   private MessageAggregationStrategy aggregator;
 
   /**
-   * Configures the route
+   * Configures the route.
+   *
    * @throws Exception in case of exception during configuration
    */
   @Override

eip-aggregator/src/main/java/com/iluwatar/eip/aggregator/routes/MessageAggregationStrategy.java

@@ -28,8 +28,8 @@ import org.apache.camel.processor.aggregate.AggregationStrategy;
 import org.springframework.stereotype.Component;
 
 /**
- * Aggregation strategy joining bodies of messages. If message is first one <i>oldMessage</i> is null. All changes are
+ * Aggregation strategy joining bodies of messages. If message is first one <i>oldMessage</i> is
- * made on IN messages.
+ * null. All changes are made on IN messages.
  */
 @Component
 public class MessageAggregationStrategy implements AggregationStrategy {

eip-message-channel/src/main/java/com/iluwatar/eip/message/channel/App.java

@@ -30,12 +30,11 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * 
  * When two applications communicate with each other using a messaging system they first need to
  * establish a communication channel that will carry the data. Message Channel decouples Message
  * producers and consumers.
- * <p>
+ *
- * The sending application doesn't necessarily know what particular application will end up
+ * <p>The sending application doesn't necessarily know what particular application will end up
  * retrieving it, but it can be assured that the application that retrieves the information is
  * interested in that information. This is because the messaging system has different Message
  * Channels for different types of information the applications want to communicate. When an
@@ -44,19 +43,18 @@ import org.slf4j.LoggerFactory;
  * Likewise, an application that wants to receive particular information doesn't pull info off some
  * random channel; it selects what channel to get information from based on what type of information
  * it wants.
- * <p>
+ *
- * In this example we use Apache Camel to establish two different Message Channels. The first one
+ * <p>In this example we use Apache Camel to establish two different Message Channels. The first
- * reads from standard input and delivers messages to Direct endpoint. The second Message Channel is
+ * one reads from standard input and delivers messages to Direct endpoint. The second Message
- * established from the Direct component to console output. No actual messages are sent, only the
+ * Channel is established from the Direct component to console output. No actual messages are sent,
- * established routes are printed to standard output.
+ * only the established routes are printed to standard output.
- * 
  */
 public class App {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
 
   /**
-   * Program entry point
+   * Program entry point.
    */
   public static void main(String[] args) throws Exception {
     CamelContext context = new DefaultCamelContext();

eip-publish-subscribe/src/main/java/com/iluwatar/eip/publish/subscribe/App.java

@@ -31,30 +31,28 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * 
  * There are well-established patterns for implementing broadcasting. The Observer pattern describes
  * the need to decouple observers from their subject (that is, the originator of the event) so that
  * the subject can easily provide event notification to all interested observers no matter how many
  * observers there are (even none). The Publish-Subscribe pattern expands upon Observer by adding
  * the notion of an event channel for communicating event notifications.
- * <p>
+ *
- * A Publish-Subscribe Channel works like this: It has one input channel that splits into multiple
+ * <p>A Publish-Subscribe Channel works like this: It has one input channel that splits into
- * output channels, one for each subscriber. When an event is published into the channel, the
+ * multiple output channels, one for each subscriber. When an event is published into the channel,
- * Publish-Subscribe Channel delivers a copy of the message to each of the output channels. Each
+ * the Publish-Subscribe Channel delivers a copy of the message to each of the output channels. Each
  * output end of the channel has only one subscriber, which is allowed to consume a message only
  * once. In this way, each subscriber gets the message only once, and consumed copies disappear from
  * their channels.
- * <p>
+ *
- * In this example we use Apache Camel to establish a Publish-Subscribe Channel from "direct-origin"
+ * <p>In this example we use Apache Camel to establish a Publish-Subscribe Channel from
- * to "mock:foo", "mock:bar" and "stream:out".
+ * "direct-origin" to "mock:foo", "mock:bar" and "stream:out".
- * 
  */
 public class App {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
 
   /**
-   * Program entry point
+   * Program entry point.
    */
   public static void main(String[] args) throws Exception {
     CamelContext context = new DefaultCamelContext();

eip-splitter/src/main/java/com/iluwatar/eip/splitter/App.java

@@ -30,23 +30,24 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.ConfigurableApplicationContext;
 
 /**
- * It is very common in integration systems that incoming messages consists of many items bundled together. For example
+ * It is very common in integration systems that incoming messages consists of many items bundled
- * an invoice document contains multiple invoice lines describing transaction (quantity, name of provided
+ * together. For example an invoice document contains multiple invoice lines describing transaction
- * service/sold goods, price etc.). Such bundled messages may not be accepted by other systems. This is where splitter
+ * (quantity, name of provided service/sold goods, price etc.). Such bundled messages may not be
- * pattern comes in handy. It will take the whole document, split it based on given criteria and send individual
+ * accepted by other systems. This is where splitter pattern comes in handy. It will take the whole
- * items to the endpoint.
+ * document, split it based on given criteria and send individual items to the endpoint.
  *
  * <p>
- * Splitter allows you to split messages based on defined criteria. It takes original message, process it and send
+ * Splitter allows you to split messages based on defined criteria. It takes original message,
- * multiple parts to the output channel. It is not defined if it should keep the order of items though.
+ * process it and send multiple parts to the output channel. It is not defined if it should keep the
+ * order of items though.
  * </p>
- *
  */
 @SpringBootApplication
 public class App {
 
   /**
-   * Program entry point. It starts Spring Boot application and using Apache Camel it auto-configures routes.
+   * Program entry point. It starts Spring Boot application and using Apache Camel it
+   * auto-configures routes.
    *
    * @param args command line args
    */

eip-splitter/src/main/java/com/iluwatar/eip/splitter/routes/SplitterRoute.java

@@ -29,19 +29,19 @@ import org.springframework.stereotype.Component;
 /**
  * Sample splitter route definition.
  *
- * <p>
+ * <p>It consumes messages out of the <i>direct:entry</i> entry point and forwards them to
- * It consumes messages out of the <i>direct:entry</i> entry point and forwards them to <i>direct:endpoint</i>.
+ * <i>direct:endpoint</i>. Route accepts messages having body of array or collection of objects.
- * Route accepts messages having body of array or collection of objects. Splitter component split message body and
+ * Splitter component split message body and forwards single objects to the endpoint.
- * forwards single objects to the endpoint.
- * </p>
  *
- * In this example input/output endpoints names are stored in <i>application.properties</i> file.
+ * <p>In this example input/output endpoints names are stored in <i>application.properties</i>
+ * file.
  */
 @Component
 public class SplitterRoute extends RouteBuilder {
 
   /**
-   * Configures the route
+   * Configures the route.
+   *
    * @throws Exception in case of exception during configuration
    */
   @Override

eip-wire-tap/src/main/java/com/iluwatar/eip/wiretap/App.java

@@ -30,21 +30,23 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.ConfigurableApplicationContext;
 
 /**
- * In most integration cases there is a need to monitor the messages flowing through the system. It is usually achieved
+ * In most integration cases there is a need to monitor the messages flowing through the system. It
- * by intercepting the message and redirecting it to a different location like console, filesystem or the database.
+ * is usually achieved by intercepting the message and redirecting it to a different location like
- * It is important that such functionality should not modify the original message and influence the processing path.
+ * console, filesystem or the database. It is important that such functionality should not modify
+ * the original message and influence the processing path.
  *
  * <p>
- * Wire Tap allows you to route messages to a separate location while they are being forwarded to the ultimate
+ * Wire Tap allows you to route messages to a separate location while they are being forwarded to
- * destination. It basically consumes messages of the input channel and publishes the unmodified message to both
+ * the ultimate destination. It basically consumes messages of the input channel and publishes the
- * output channels.
+ * unmodified message to both output channels.
  * </p>
  */
 @SpringBootApplication
 public class App {
 
   /**
-   * Program entry point. It starts Spring Boot application and using Apache Camel it auto-configures routes.
+   * Program entry point. It starts Spring Boot application and using Apache Camel it
+   * auto-configures routes.
    *
    * @param args command line args
    */

eip-wire-tap/src/main/java/com/iluwatar/eip/wiretap/routes/WireTapRoute.java

@@ -29,19 +29,20 @@ import org.springframework.stereotype.Component;
 /**
  * Sample wire tap route definition.
  *
- * <p>
+ * <p>It consumes messages out of the <i>direct:entry</i> entry point and forwards them to
- * It consumes messages out of the <i>direct:entry</i> entry point and forwards them to <i>direct:endpoint</i>.
+ * <i>direct:endpoint</i>. Wire Tap intercepts the message and sends it to <i>direct:wireTap</i>,
- * Wire Tap intercepts the message and sends it to <i>direct:wireTap</i>, which in turn forwards it to
+ * which in turn forwards it to
  * <i>direct:wireTapEndpoint</i>.
- * </p>
  *
- * In this example input/output endpoints names are stored in <i>application.properties</i> file.
+ * <p>In this example input/output endpoints names are stored in <i>application.properties</i>
+ * file.
  */
 @Component
 public class WireTapRoute extends RouteBuilder {
 
   /**
-   * Configures the route
+   * Configures the route.
+   *
    * @throws Exception in case of exception during configuration
    */
   @Override