diff --git a/pom.xml b/pom.xml
index 2006b39..fb11db6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -24,7 +24,7 @@
 		<developerConnection>scm:git:https://code-repo.d4science.org/gCubeSystem/${project.artifactId}</developerConnection>
 		<url>https://code-repo.d4science.org/gCubeSystem/${project.artifactId}</url>
 	</scm>
-		<properties>
+	<properties>
 		<!-- Convenience property to set the GWT version -->
 		<gwtVersion>2.7.0</gwtVersion>
 		<liferay.version>6.2.5</liferay.version>
@@ -39,7 +39,7 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 	</properties>
-	
+
 	<profiles>
 		<profile>
 			<id>localRun</id>
@@ -72,7 +72,7 @@
 			<dependency>
 				<groupId>org.gcube.distribution</groupId>
 				<artifactId>maven-portal-bom</artifactId>
-				<version>3.6.4-SNAPSHOT</version>
+				<version>3.7.0-SNAPSHOT</version>
 				<type>pom</type>
 				<scope>import</scope>
 			</dependency>
@@ -276,6 +276,13 @@
 			<version>3.1.7</version>
 			<scope>compile</scope>
 		</dependency>
+		<!-- https://mvnrepository.com/artifact/org.json/json -->
+		<dependency>
+			<groupId>org.json</groupId>
+			<artifactId>json</artifactId>
+			<version>20220320</version>
+		</dependency>
+
 	</dependencies>
 
 	<build>
diff --git a/src/main/java/org/gcube/portlets/admin/resourcemanagement/server/RegistryClientRequester.java b/src/main/java/org/gcube/portlets/admin/resourcemanagement/server/RegistryClientRequester.java
index b0e4f53..000d55f 100644
--- a/src/main/java/org/gcube/portlets/admin/resourcemanagement/server/RegistryClientRequester.java
+++ b/src/main/java/org/gcube/portlets/admin/resourcemanagement/server/RegistryClientRequester.java
@@ -6,18 +6,13 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
-import java.util.Map;
 import java.util.Set;
 
 import org.gcube.common.authorization.library.provider.AccessTokenProvider;
 import org.gcube.common.keycloak.KeycloakClient;
 import org.gcube.common.keycloak.KeycloakClientFactory;
-import org.gcube.common.keycloak.model.AccessToken.Access;
-import org.gcube.common.keycloak.model.ModelUtils;
 import org.gcube.common.keycloak.model.TokenResponse;
 import org.gcube.common.scope.api.ScopeProvider;
-import org.gcube.common.scope.impl.ScopeBean;
-import org.gcube.informationsystem.contexts.reference.entities.Context;
 import org.gcube.informationsystem.model.reference.entities.Resource;
 import org.gcube.informationsystem.resourceregistry.api.contexts.ContextCache;
 import org.gcube.informationsystem.resourceregistry.client.ResourceRegistryClient;
@@ -107,15 +102,17 @@ public class RegistryClientRequester {
 					val = "GenericResource";
 				if (t.getName().equals("HostingNode"))
 					val = "GHN";
-				try {
-					if (val!=null) {
-						ArrayList<String> subtrees = UtilityResource.getSubResourcesTreeQuery(resourceRegistryClient, t.getName());
-						if (!subtrees.isEmpty())
-							retval.put(val, subtrees);
+
+				if (val!=null) {
+					ArrayList<String> subtrees = new ArrayList<String>();
+					try {
+						subtrees = UtilityResource.getSubResourcesTreeQuery(resourceRegistryClient, t.getName());
+					}catch (Exception e) {
+						e.printStackTrace();
 					}
-				}catch (Exception e) {
-					e.printStackTrace();
+					retval.put(val, subtrees);
 				}
+
 			}
 
 		} catch (Exception e) {
diff --git a/src/main/java/org/gcube/portlets/admin/resourcemanagement/server/ServiceProxyImpl.java b/src/main/java/org/gcube/portlets/admin/resourcemanagement/server/ServiceProxyImpl.java
index a67b953..eb25c60 100644
--- a/src/main/java/org/gcube/portlets/admin/resourcemanagement/server/ServiceProxyImpl.java
+++ b/src/main/java/org/gcube/portlets/admin/resourcemanagement/server/ServiceProxyImpl.java
@@ -287,6 +287,10 @@ public class ServiceProxyImpl extends RemoteServiceServlet implements ServicePro
 					
 			HashMap<String, ArrayList<String>>  results = RegistryClientRequester.getResourcesTree(scope);
 			
+			System.out.println("get result type tree: ("+results.size()+") /n"
+					+ results.keySet() );
+			
+			
 			return results;
 		} catch (Exception e) {
 			ServerConsole.error(LOG_PREFIX, "applying resource get", e);
diff --git a/src/main/java/org/gcube/portlets/admin/resourcemanagement/shared/resource/UtilityResource.java b/src/main/java/org/gcube/portlets/admin/resourcemanagement/shared/resource/UtilityResource.java
index a59106a..b1ed7db 100644
--- a/src/main/java/org/gcube/portlets/admin/resourcemanagement/shared/resource/UtilityResource.java
+++ b/src/main/java/org/gcube/portlets/admin/resourcemanagement/shared/resource/UtilityResource.java
@@ -38,9 +38,9 @@ import org.gcube.resourcemanagement.model.reference.entities.resources.HostingNo
 import org.gcube.resourcemanagement.model.reference.relations.consistsof.HasPersistentMemory;
 import org.gcube.resourcemanagement.model.reference.relations.consistsof.HasVolatileMemory;
 import org.gcube.resourcemanagement.model.reference.relations.consistsof.IsIdentifiedBy;
+import org.json.JSONArray;
+import org.json.JSONObject;
 
-import com.google.gwt.thirdparty.json.JSONArray;
-import com.google.gwt.thirdparty.json.JSONObject;
 
 
 
@@ -50,8 +50,8 @@ import com.google.gwt.thirdparty.json.JSONObject;
  *
  */
 public class UtilityResource {
- 
-	
+
+
 
 	public static ArrayList<String> getSubResourcesTree(ResourceRegistryClient resourceRegistryClient, String entity, String scope) throws Exception{
 		ArrayList<String> list = new ArrayList<>();
@@ -132,21 +132,27 @@ public class UtilityResource {
 
 		default:
 			return new ArrayList<>(0);
-			
+
 		}
-		
-			
-		String query="SELECT DISTINCT("+field+") AS "+field+" "
-				+ "FROM (TRAVERSE outE('IsIdentifiedBy'),inV('"+identifiedFacet+"') FROM "+entity+")";
 
-		System.out.println("------------query----------->"+query);
+		try {	
+			String query="SELECT DISTINCT("+field+") AS "+field+" "
+					+ "FROM (TRAVERSE outE('IsIdentifiedBy'),inV('"+identifiedFacet+"') FROM "+entity+")";
 
-		String result=resourceRegistryClient.rawQuery(query, 1000, null);
-		JSONObject jsonObj = new JSONObject(result);
-		JSONArray jsonArray=jsonObj.getJSONArray("result");
+			System.out.println("------------query----------->"+query);
 
-		for(int i=0;i < jsonArray.length();i++){                                     
-			list.add(jsonArray.getJSONObject(i).getString(field));
+			String result=resourceRegistryClient.rawQuery(query, 1000, null);
+
+			if (!result.isEmpty()) {
+				JSONObject jsonObj = new JSONObject(result);
+				JSONArray jsonArray=jsonObj.getJSONArray("result");
+
+				for(int i=0;i < jsonArray.length();i++){                                     
+					list.add(jsonArray.getJSONObject(i).getString(field));
+				}
+			}
+		}catch (Exception e) {
+			e.printStackTrace();
 		}
 		return list;