getting ClassNotFoundException when trying to run gremlin query g.V().valueMap for custom class

I am storing the Map <String,Address> into graph as property like: Map<String, Address> location = new HashMap<>(); location.put("Address",new Address("pune","412216")); g.addV("person").property("name",name).property("locality",location).next(); I am able to fetch this value correctly through java code......but when tried through gremlin console...I am getting classNotFound error. see attached screenshot. anyone know how we can solve this issue.