added sleep of 20 seconds betweeb Site/VRE Creation and users assoc.

src/main/java/org/gcube/portlets/admin/vredeployer/server/VREDeployerServiceImpl.java

@@ -154,6 +154,7 @@ public class VREDeployerServiceImpl  extends RemoteServiceServlet implements Vre
 	private static final String VRE_MANAGER = "VRE-Manager";
 	private static final String VRE_DESIGNER = "VRE-Designer";
 
+	private static final int WAITING_TIME_Seconds = 24;
 	/**
 	 * 
 	 */
@@ -938,8 +939,14 @@ public class VREDeployerServiceImpl  extends RemoteServiceServlet implements Vre
 			log.info("Trying to create VRE Group Folder through Storage Hub ...");
 			createVRESharedGroupFolder(uman, vreCreated, designer, manager, description);
 
-			log.info("--- createVRESharedGroupFolder OK, now assigning the designer and manager to the Site (VRE)");
-
+			log.info("--- createVRESharedGroupFolder OK, \n "
+					+ "now assigning the designer and manager to the Site (VRE), sleeping "+ WAITING_TIME_Seconds + " seconds to allow operations on Keycloak ...");
+			
+			//the creation of groups on Keycloak is asynchronous, if we send an add user to group before the group is actually created on keycloak it would fails, so we wait
+			Thread.sleep(WAITING_TIME_Seconds / 2 * 1000);
+			log.info("\n still waiting ... 10 seconds more ... ");
+			Thread.sleep(WAITING_TIME_Seconds / 2 * 1000);
+			
 			RoleManager rm = new LiferayRoleManager();
 
 			if (manager.compareTo(currUser) != 0) {