Put back the maven-compiler-plugin

pom.xml

@@ -48,4 +48,20 @@
       <scope>test</scope>
     </dependency>
   </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.1</version>
+        <configuration>
+          <source>1.6</source>
+          <target>1.6</target>
+          <encoding>UTF-8</encoding>
+          <compilerArgument>-Xlint:unchecked</compilerArgument>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
 </project>