Inclusion of log4j dependency rather than relying on

System.out.println() statements.
Added unit tests for doa module.

pom.xml

@@ -18,6 +18,7 @@
 		<jacoco.version>0.7.2.201409121644</jacoco.version>
 		<commons-dbcp.version>1.4</commons-dbcp.version>
 		<camel.version>2.15.3</camel.version>
+		<log4j.version>1.2.17</log4j.version>
 	</properties>
 	<modules>
 		<module>abstract-factory</module>
@@ -122,6 +123,11 @@
 				<version>${junit.version}</version>
 				<scope>test</scope>
 			</dependency>
+			<dependency>
+				<groupId>log4j</groupId>
+				<artifactId>log4j</artifactId>
+				<version>${log4j.version}</version>
+			</dependency>
 		</dependencies>
 	</dependencyManagement>