ImmutableList<T> is not supporting by hibernate

Hi,

i want to fulfill the requirements of Immutable entity classes, therefore the class is annotated with `@Immutable`
i have a list field to another entity class, so, instead of `List` i used the `ImmutableList` as the type of a field.
it is built, but when the tables are to be created by Hibernate, i have the `error : Illegal attempt to map a non collection as a @OneToMany, @ManyToMany or @CollectionOfElements: model.User.roles`