maven cleanup

assertj/pom.xml

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <groupId>com.baeldung</groupId>
@@ -9,11 +8,18 @@
     <version>1.0.0-SNAPSHOT</version>
 
     <dependencies>
+
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>19.0</version>
+            <version>${guava.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-guava</artifactId>
+            <version>3.0.0</version>
+        </dependency>
+
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
@@ -26,11 +32,7 @@
             <version>3.5.1</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>org.assertj</groupId>
-            <artifactId>assertj-guava</artifactId>
-            <version>3.0.0</version>
-        </dependency>
+
     </dependencies>
 
     <build>
@@ -46,4 +48,9 @@
             </plugin>
         </plugins>
     </build>
+
+    <properties>
+        <guava.version>19.0</guava.version>
+    </properties>
+    
 </project>