“hibernate_sequence“ does not exist

org.postgresql.util.PSQLException: ERROR: relation "hibernate_sequence" does not exist
  Position: 17
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2062)
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1795)
......

I got this exception trying execute (persist) the below code snippets: 

@Entity
@Table(name = "users")
public class User {
private Long id;
private Set<String> roles = new HashSet<String>();
@Id
    @GeneratedValue()
    public Integer getId() {
        return id;
    }
// more getters & setters
@CollectionOfElements(targetElement = java.lang.String.class)
    @JoinTable(name = "user_roles", joinColumns = @Jo