diff --git a/src/main/java/it/inaf/oats/vospace/persistence/NodeDAO.java b/src/main/java/it/inaf/oats/vospace/persistence/NodeDAO.java
index a3f144407735684dfbcf3fc47dcf815d6c25be06..632d9d6fef2c5c228e1061791f701458a7e7392d 100644
--- a/src/main/java/it/inaf/oats/vospace/persistence/NodeDAO.java
+++ b/src/main/java/it/inaf/oats/vospace/persistence/NodeDAO.java
@@ -228,11 +228,9 @@ public class NodeDAO {
         addProperty(NodeProperties.PUBLIC_READ_URI, String.valueOf(rs.getBoolean("is_public")),
                 properties);
 
-        addProperty(NodeProperties.QUOTA_URI, String.valueOf(rs.getString("quota")),
-                properties);
+        addProperty(NodeProperties.QUOTA_URI, rs.getString("quota"), properties);
 
-        addProperty(NodeProperties.MD5_URI, String.valueOf(rs.getString("content_md5")),
-                properties);
+        addProperty(NodeProperties.MD5_URI, rs.getString("content_md5"), properties);
 
         addProperty("urn:async_trans", String.valueOf(rs.getBoolean("async_trans")),
                 properties);
@@ -329,7 +327,7 @@ public class NodeDAO {
     }
 
     public void copyBranch(String sourceVosPath, String destVosPath) {
-        
+
         String destVosParentPath = NodeUtils.getParentPath(destVosPath);
         String destName = NodeUtils.getNodeName(destVosPath);
 
@@ -372,15 +370,15 @@ public class NodeDAO {
                 + "copied_nodes_paths AS ("
                 + cteCopiedNodesPaths + ")\n"
                 + parentSelect;
-             
+
         jdbcTemplate.update(conn -> {
             PreparedStatement ps = conn.prepareStatement(sql);
             ps.setString(1, destVosParentPath);
             ps.setString(2, destName);
             ps.setString(3, sourceVosPath);
             return ps;
-        });      
-        
+        });
+
     }
 
     public boolean isBranchBusy(long parentNodeId) {
@@ -404,15 +402,15 @@ public class NodeDAO {
             return ps;
         });
     }
-    
+
     public void releaseBusyNodesByJobId(String jobId) {
         String sql = "UPDATE node SET job_id = NULL WHERE job_id = ?";
-        
+
         jdbcTemplate.update(conn -> {
             PreparedStatement ps = conn.prepareStatement(sql);
-            ps.setString(1, jobId);           
+            ps.setString(1, jobId);
             return ps;
-        });        
+        });
     }
 
     public boolean isBranchWritable(long parentNodeId, String userId, List<String> userGroups) {
@@ -755,7 +753,7 @@ public class NodeDAO {
         public boolean isPermissionDenied() {
             return permissionDenied;
         }
-        
+
         public boolean isSticky() {
             return sticky;
         }