diff --git a/src/main/java/org/gcube/social_networking/socialnetworking/model/beans/WorkspaceNotification.java b/src/main/java/org/gcube/social_networking/socialnetworking/model/beans/WorkspaceNotification.java
index 25b3aa0..0b41e23 100644
--- a/src/main/java/org/gcube/social_networking/socialnetworking/model/beans/WorkspaceNotification.java
+++ b/src/main/java/org/gcube/social_networking/socialnetworking/model/beans/WorkspaceNotification.java
@@ -1,9 +1,6 @@
 package org.gcube.social_networking.socialnetworking.model.beans;
 
-import javax.validation.constraints.NotNull;
-
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
-import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonSubTypes;
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import com.fasterxml.jackson.annotation.JsonTypeInfo.As;