diff --git a/src/main/java/org/gcube/portlets/user/speciesdiscovery/server/job/OccurrenceJobUtil.java b/src/main/java/org/gcube/portlets/user/speciesdiscovery/server/job/OccurrenceJobUtil.java
index bce7280..63dfd4a 100644
--- a/src/main/java/org/gcube/portlets/user/speciesdiscovery/server/job/OccurrenceJobUtil.java
+++ b/src/main/java/org/gcube/portlets/user/speciesdiscovery/server/job/OccurrenceJobUtil.java
@@ -430,7 +430,8 @@ public class OccurrenceJobUtil {
 		XStreamUtil<KeyStringList> xstreamUtil = new XStreamUtil<KeyStringList>(ALIASKEY,KeyStringList.class);
 		
 		for (String key : keys) {
-			System.out.println("key :"+ key);
+//			System.out.println("key :"+ key);
+			logger.info("key converted: "+key);
 			keyStringList.addKey(key);
 		}
 		
diff --git a/src/main/java/org/gcube/portlets/user/speciesdiscovery/server/service/QueryBuilder.java b/src/main/java/org/gcube/portlets/user/speciesdiscovery/server/service/QueryBuilder.java
index f19c879..714ffe7 100644
--- a/src/main/java/org/gcube/portlets/user/speciesdiscovery/server/service/QueryBuilder.java
+++ b/src/main/java/org/gcube/portlets/user/speciesdiscovery/server/service/QueryBuilder.java
@@ -121,8 +121,9 @@ public class QueryBuilder {
 		try {
 			SPQLQueryParser.parse(builtQuery);
 		} catch (ParserException e) {
-			System.out.println("error parsing");
-			e.printStackTrace();
+			logger.error("Parsing error: ",e);
+//			System.out.println("error parsing");
+//			e.printStackTrace();
 		}
 
 		return builtQuery;