diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/contexts/security/TypeSecurityContext.java b/src/main/java/org/gcube/informationsystem/resourceregistry/contexts/security/TypeSecurityContext.java
index 1f462fe..812ba22 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/contexts/security/TypeSecurityContext.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/contexts/security/TypeSecurityContext.java
@@ -7,9 +7,6 @@ import org.gcube.informationsystem.resourceregistry.contexts.ContextUtility;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.orientechnologies.orient.core.metadata.security.ORole;
-import com.orientechnologies.orient.core.metadata.security.ORule;
-
 /**
  * @author Luca Frosini (ISTI - CNR)
  */
diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/instances/base/properties/PropertyElementManagement.java b/src/main/java/org/gcube/informationsystem/resourceregistry/instances/base/properties/PropertyElementManagement.java
index 7ddab3b..ebfa989 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/instances/base/properties/PropertyElementManagement.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/instances/base/properties/PropertyElementManagement.java
@@ -35,8 +35,6 @@ import org.slf4j.LoggerFactory;
 
 import com.arcadedb.database.Document;
 import com.arcadedb.schema.DocumentType;
-import com.orientechnologies.orient.core.metadata.schema.OClass;
-import com.orientechnologies.orient.core.record.impl.ODocument;
 
 /**
  * @author Luca Frosini (ISTI - CNR)
diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/instances/model/entities/EntityManagement.java b/src/main/java/org/gcube/informationsystem/resourceregistry/instances/model/entities/EntityManagement.java
index b8d0899..c4f7a4c 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/instances/model/entities/EntityManagement.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/instances/model/entities/EntityManagement.java
@@ -53,11 +53,6 @@ import com.arcadedb.query.sql.executor.Result;
 import com.arcadedb.query.sql.executor.ResultSet;
 import com.arcadedb.remote.RemoteDatabase;
 import com.arcadedb.schema.DocumentType;
-import com.orientechnologies.orient.core.db.document.ODatabaseDocument;
-import com.orientechnologies.orient.core.metadata.schema.OClass;
-import com.orientechnologies.orient.core.record.ODirection;
-import com.orientechnologies.orient.core.record.OEdge;
-import com.orientechnologies.orient.core.record.OVertex;
 
 /**
  * @author Luca Frosini (ISTI - CNR)