diff --git a/avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AbstractAvatarResource.java b/avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AbstractAvatarResource.java
index ef5e718..c6860f4 100644
--- a/avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AbstractAvatarResource.java
+++ b/avatar-realm-resource/src/main/java/org/gcube/keycloak/avatar/AbstractAvatarResource.java
@@ -1,6 +1,7 @@
 package org.gcube.keycloak.avatar;
 
 import java.io.InputStream;
+import java.lang.reflect.InvocationTargetException;
 
 import javax.ws.rs.NotFoundException;
 import javax.ws.rs.core.Response;
@@ -51,8 +52,10 @@ public abstract class AbstractAvatarResource {
                     DEFAULT_IMPLEMENTATION.getName());
 
             try {
-                asp = (AvatarStorageProvider) DEFAULT_IMPLEMENTATION.newInstance();
-            } catch (InstantiationException | IllegalAccessException e) {
+                asp = (AvatarStorageProvider) DEFAULT_IMPLEMENTATION.getDeclaredConstructor().newInstance();
+            } catch (InstantiationException | IllegalAccessException | IllegalArgumentException
+                    | InvocationTargetException | NoSuchMethodException | SecurityException e) {
+
                 logger.error("Cannot instatiate storage implementation class", e);
             }
         }
@@ -73,7 +76,6 @@ public abstract class AbstractAvatarResource {
         return is != null ? output -> IOUtils.copy(is, output) : null;
     }
 
-
     protected Response fetchAndCreateResponse(RealmModel realm, UserModel user) {
         StreamingOutput so = fetchUserImage(realm, user);
         if (so == null) {
diff --git a/event-listener-provider/src/main/java/org/gcube/keycloak/event/OrchestratorEventPublisherProviderFactory.java b/event-listener-provider/src/main/java/org/gcube/keycloak/event/OrchestratorEventPublisherProviderFactory.java
index d13d96d..c76b879 100644
--- a/event-listener-provider/src/main/java/org/gcube/keycloak/event/OrchestratorEventPublisherProviderFactory.java
+++ b/event-listener-provider/src/main/java/org/gcube/keycloak/event/OrchestratorEventPublisherProviderFactory.java
@@ -31,7 +31,7 @@ public class OrchestratorEventPublisherProviderFactory implements EventListenerP
     public static URL KEYCLOAK_ENDPOINT;
     public static String KEYCLOAK_CLIENT_SECRET;
 
-    protected Long lastEndpointCheck = new Long(0);
+    protected Long lastEndpointCheck = Long.valueOf(0);
     protected OrchestratorEventPublisherProvider oepp;
 
     public OrchestratorEventPublisherProviderFactory() {