CDI events are not fired when event object is not the compile-defined object, but the generic type. In this case the real object is defined in runtime and this is ok. But the event is not fired.

Classes example and detailed description is available here (will not paste here so that not to make the description enormous): http://stackoverflow.com/questions/8962446/cdi-events-and-generics

In addition to classes defined there will paste the entity classes:

public interface Persistable extends Serializable {
Long getId();
//...
}

and Polis class:

@Entity
public class Polis implements Persistable {
//... fields and setters/getters here
}

Hope this will be enough