Centraliting maven-jar-plugin version definition

P/Sd1/Wc/readFile/pom.xml

@@ -23,7 +23,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
-        <version>2.4</version>
+        <version>${org.apache.maven.plugins.maven-jar-plugin}</version>
         <configuration>
           <archive>
             <manifest>

P/Sd1/Wc/wc/pom.xml

@@ -23,7 +23,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
-        <version>2.5</version>
+        <version>${org.apache.maven.plugins.maven-jar-plugin}</version>
         <configuration>
           <archive>
             <manifest>

P/Sd1/WordFrequency1/Solution/pom.xml

@@ -23,7 +23,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
-        <version>2.4</version>
+        <version>${org.apache.maven.plugins.maven-jar-plugin}</version>
         <configuration>
           <archive>
             <manifest>

P/Sd1/WordFrequency2/Solution1/pom.xml

@@ -24,7 +24,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
-        <version>2.4</version>
+        <version>${org.apache.maven.plugins.maven-jar-plugin}</version>
         <configuration>
           <archive>
             <manifest>

P/Sd1/WordFrequency2/Solution2/pom.xml

@@ -24,7 +24,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
-        <version>2.4</version>
+        <version>${org.apache.maven.plugins.maven-jar-plugin}</version>
         <configuration>
           <archive>
             <manifest>

pom.xml

@@ -6,11 +6,14 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
+    <!-- dependencies -->
     <jaxen.jaxen.version>1.1.6</jaxen.jaxen.version>
-
     <mysql.mysql-connector-java.version>5.1.36</mysql.mysql-connector-java.version>
     <org.jdom.jdom2.version>2.0.6</org.jdom.jdom2.version>
 
+   <!-- Maven plugins -->
+    <org.apache.maven.plugins.maven-jar-plugin>2.6</org.apache.maven.plugins.maven-jar-plugin>
+  
   </properties>