More checkstyle improvements on Offer components

src/main/java/de/rwu/easydrop/service/validation/OfferValidator.java

@@ -7,7 +7,7 @@ import de.rwu.easydrop.model.Offer;
  *
  * @since 0.2.0
  */
-public class OfferValidator {
+public final class OfferValidator {
         /**
      * Private constructor to prevent unwanted instantiation.
      *
@@ -21,7 +21,7 @@ public class OfferValidator {
      *
      * @param offer the Offer
      */
-    public static void validate(final Offer offer) {}
+    public static void validate(final Offer offer) { }
 }
 
 

src/main/java/de/rwu/easydrop/service/writer/OfferWriter.java

@@ -22,7 +22,7 @@ public class OfferWriter {
     /**
      * Validates and saves product to persistence.
      *
-     * @param product
+     * @param offer
      */
     public void writeOfferToPersistence(final Offer offer) {
         OfferValidator.validate(offer);