common-codes problem solved. New instruction to solve the building with Maven is illustrated

Author: imghasemi

README.md

@@ -10,3 +10,49 @@ Contains the SANSA Examples for [Apache Spark](http://spark.apache.org/).
 
 ### [sansa-examples-flink](https://github.com/SANSA-Stack/SANSA-Examples/tree/master/sansa-examples-flink)
 Contains the SANSA Examples for [Apache Flink](http://flink.apache.org/).
+
+## Not able to build the project with maven then read this section:
+*Step 1:* just make sure you are using the updated Maven Package Manager. Just run the `mvn --version` to be sure that your mvn is the latest. If it is not then run following commands in your prefered termianl:
+As the project is under development might have some problems and end up with errors during the `mvn clean install -U` building process. Therefore, hopefully there is a solution to solve this issue:
+
+```
+sudo apt-get --only-upgrade install maven
+mvn --versoin
+```
+if it does not update your current maven (last version is 3.6.0) then follow these commands:
+
+``` 
+cd ~/Downloads
+wget http://apache.mirror.digionline.de/maven/maven-3/3.6.0/binaries/apache-maven-3.6.0-bin.tar.gz
+sudo mkdir -p /usr/local/apache-maven
+sudo mv apache-maven-3.6.0-bin.tar.gz /usr/local/apache-maven
+cd /usr/local/apache-maven
+sudo tar -xzvf apache-maven-3.6.0-bin.tar.gz
+```
+*Step 2:* then based on your default `$SHELL` add following env variables:
+
+``` 
+#MAVEN env variables
+export M2_HOME=/usr/local/apache-maven/apache-maven-3.6.0
+export M2=$M2_HOME/bin
+export MAVEN_OPTS="-Xms256m -Xmx512m"
+export PATH=$M2:$PATH
+``` 
+Do not remember to source new environmental variables:
+``` 
+source ~/.bashrc
+```
+
+Now just check if the installation process is done correctly run this command:
+
+``` 
+mvn --version
+```
+
+Results: 
+
+![alt text](https://i.imgur.com/gRK41hK.png)
+
+![alt text](https://i.imgur.com/3BwAp7f.png)
+
+

pom.xml

@@ -160,7 +160,7 @@
 			</dependency>
 
 			<!-- Guava -->
-			<!-- <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> 
+			<!-- <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId>
 				<version>19.0</version> </dependency> -->
 
 			<!-- RDF Layer -->
@@ -239,6 +239,12 @@
 				<scope>import</scope>
 			</dependency>
 
+            <!-- Commons-codec dependency: solve the issue of making clean install-->
+            <dependency>
+                <groupId>commons-codec</groupId>
+                <artifactId>commons-codec</artifactId>
+                <version>1.11</version>
+            </dependency>
 
 		</dependencies>
 	</dependencyManagement>