fixing build warnings

pom.xml

@@ -38,6 +38,12 @@
         </developer>
     </developers>
 
+    <properties>
+        <maven.compiler.source>1.7</maven.compiler.source>
+        <maven.compiler.target>1.7</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
     <dependencies>
 
         <dependency>