checkstyle violations fixing

dspace-api/src/main/java/org/dspace/app/util/SubmissionConfigReader.java

@@ -108,6 +108,10 @@ public class SubmissionConfigReader {
      */
     private SubmissionConfig lastSubmissionConfig = null;
 
+    /**
+     * Collection Service instance, needed to interact with collection's 
+     * stored data
+     */
     protected static final CollectionService collectionService
                 = ContentServiceFactory.getInstance().getCollectionService();
 

dspace-api/src/main/java/org/dspace/content/CollectionServiceImpl.java

@@ -18,7 +18,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.MissingResourceException;
 import java.util.Objects;
-import java.util.Optional;
 import java.util.Set;
 import java.util.UUID;
 

dspace-api/src/main/java/org/dspace/content/service/CollectionService.java

@@ -455,7 +455,6 @@ public interface CollectionService
     public int countCollectionsWithSubmit(String q, Context context, Community community, String entityType)
         throws SQLException, SearchServiceException;
 
-    
     /**
      * Returns a list of all collections for a specific entity type.
      * NOTE: for better performance, this method retrieves its results from an index (cache)