set object mapper for ebean

src/main/kotlin/com/restapi/domain/db.kt

@@ -170,6 +170,7 @@ object Session {
         tenantMode = TenantMode.PARTITION
         currentTenantProvider = CurrentTenantProvider { currentUser.get().tenant }
         currentUserProvider = CurrentUserProvider { currentUser.get().userName }
+        objectMapper = Session.objectMapper
     }
 
     val database: Database = DatabaseFactory.create(sc)