Upgrade maven build to Java 7

complete/pom.xml

@@ -20,6 +20,10 @@
         </dependency>
     </dependencies>
 
+    <properties>
+        <java.version>1.7</java.version>
+    </properties>
+
 
     <build>
         <plugins>

initial/pom.xml

@@ -20,6 +20,10 @@
         </dependency>
     </dependencies>
 
+    <properties>
+        <java.version>1.7</java.version>
+    </properties>
+
 
     <build>
         <plugins>