INTSAMPLES-54 - Update README.md

* Update README.md to reflect correct classes
* Add documentation for Delayer application
* Add JavaDoc for delayer application
* Delete redundant *src/main/resources/log4j.properties*
* Add logger name to *Logging Channel Adapter* configuration
* Add Maven Exec Maven Plugin for easy execution from the command line

basic/helloworld/src/main/java/org/springframework/integration/samples/helloworld/DelayerApp.java

@@ -5,11 +5,17 @@ import org.springframework.context.support.ClassPathXmlApplicationContext;
 public class DelayerApp {
 
 	/**
-	 * @param args
+	 * Simple application that polls the current system time 2 times every
+	 * 20 seconds (20000 milliseconds).
+	 *
+	 * The resulting message contains the time in milliseconds and the message
+	 * is routed to a Logging Channel Adapter which will print the time to the
+	 * command prompt.
+	 *
+	 * @param args Not used.
 	 */
 	public static void main(String[] args) throws Exception{
 		new ClassPathXmlApplicationContext("META-INF/spring/integration/delay.xml");
-		System.in.read();
 	}
 
 }

basic/helloworld/src/main/resources/META-INF/spring/integration/delay.xml

@@ -11,8 +11,8 @@
 	<int:inbound-channel-adapter expression="T(java.lang.System).currentTimeMillis()" channel="logger">
 		<int:poller fixed-delay="20000" max-messages-per-poll="2" />
 	</int:inbound-channel-adapter>
-	
-	<int:logging-channel-adapter id="logger"/>
-	
+
+	<int:logging-channel-adapter id="logger" logger-name="org.springframework.integration.samples.helloworld"/>
+
 	<task:executor id="executor" queue-capacity="20" pool-size="5-20"/>
 </beans>

basic/helloworld/src/main/resources/log4j.properties

@@ -1,9 +0,0 @@
-log4j.rootCategory=WARN, stdout
-
-log4j.appender.stdout=org.apache.log4j.ConsoleAppender
-log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
-log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %t %c{2}:%L - %m%n
-
-#log4j.category.org.springframework=WARN
-#log4j.category.org.springframework.integration.sftp=TRACE
-log4j.category.org.springframework=TRACE

basic/helloworld/src/main/resources/log4j.xml

@@ -24,5 +24,5 @@
 		<priority value="warn" />
 		<appender-ref ref="console" />
 	</root>
-	
+
 </log4j:configuration>