diff --git a/.settings/org.eclipse.core.resources.prefs b/.settings/org.eclipse.core.resources.prefs
deleted file mode 100644
index 29abf99..0000000
--- a/.settings/org.eclipse.core.resources.prefs
+++ /dev/null
@@ -1,6 +0,0 @@
-eclipse.preferences.version=1
-encoding//src/main/java=UTF-8
-encoding//src/main/resources=UTF-8
-encoding//src/test/java=UTF-8
-encoding//src/test/resources=UTF-8
-encoding/<project>=UTF-8
diff --git a/.settings/org.eclipse.jdt.core.prefs b/.settings/org.eclipse.jdt.core.prefs
deleted file mode 100644
index 714351a..0000000
--- a/.settings/org.eclipse.jdt.core.prefs
+++ /dev/null
@@ -1,5 +0,0 @@
-eclipse.preferences.version=1
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
-org.eclipse.jdt.core.compiler.compliance=1.8
-org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
-org.eclipse.jdt.core.compiler.source=1.8
diff --git a/.settings/org.eclipse.m2e.core.prefs b/.settings/org.eclipse.m2e.core.prefs
deleted file mode 100644
index f897a7f..0000000
--- a/.settings/org.eclipse.m2e.core.prefs
+++ /dev/null
@@ -1,4 +0,0 @@
-activeProfiles=
-eclipse.preferences.version=1
-resolveWorkspaceProjects=true
-version=1
diff --git a/src/main/java/org/gcube/accounting/aggregator/aggregation/Aggregator.java b/src/main/java/org/gcube/accounting/aggregator/aggregation/Aggregator.java
index 279a1d0..843ea5c 100644
--- a/src/main/java/org/gcube/accounting/aggregator/aggregation/Aggregator.java
+++ b/src/main/java/org/gcube/accounting/aggregator/aggregation/Aggregator.java
@@ -68,7 +68,7 @@ public class Aggregator {
 	/**
 	 * Generate a key for map-reduce
 	 * @param key 
-	 * @return
+	 * @return JsonArray containing the map reduce key
 	 */
 	protected JsonArray generateKey(String key){		
 		JsonArray arrayKey = JsonArray.create();
diff --git a/src/main/java/org/gcube/accounting/aggregator/persistence/AggregatorPersitenceConfiguration.java b/src/main/java/org/gcube/accounting/aggregator/persistence/AggregatorPersitenceConfiguration.java
index fa0ec38..4b610cd 100644
--- a/src/main/java/org/gcube/accounting/aggregator/persistence/AggregatorPersitenceConfiguration.java
+++ b/src/main/java/org/gcube/accounting/aggregator/persistence/AggregatorPersitenceConfiguration.java
@@ -15,7 +15,7 @@ public class AggregatorPersitenceConfiguration extends AccountingPersistenceConf
 	}
 
 	/**
-	 * @param class
+	 * @param persistence
 	 *            The class of the persistence to instantiate
 	 * @throws Exception
 	 *             if fails