Can JPA Embeddable class contain an object reference?

I'm trying to embed a class to another which contains object reference. I always get

org.hibernate.MappingException: Could not determine type for: ...

exception. My question is there any way I can embed a class which contains object references, or embeddable classes only stores primitives.

I'm already tried @Target() annotation but not helps.

Yes, this is possible. Look at the documentation.

@Embeddable
public static class Publisher {

	private String name;

	@ManyToOne(fetch = FetchType.LAZY)
	private Country country;

	//Getters and setters, equals and hashCode methods omitted for brevity
}


@Entity(name = "Book")
@AttributeOverrides({
	@AttributeOverride(
		name = "ebookPublisher.name",
		column = @Column(name = "ebook_publisher_name")
	),
	@AttributeOverride(
		name = "paperBackPublisher.name",
		column = @Column(name = "paper_back_publisher_name")
	)
})
@AssociationOverrides({
	@AssociationOverride(
		name = "ebookPublisher.country",
		joinColumns = @JoinColumn(name = "ebook_publisher_country_id")
	),
	@AssociationOverride(
		name = "paperBackPublisher.country",
		joinColumns = @JoinColumn(name = "paper_back_publisher_country_id")
	)
})
public static class Book {

	@Id
	@GeneratedValue
	private Long id;

	private Publisher ebookPublisher;

	private Publisher paperBackPublisher;

	//Getters and setters are omitted for brevity
}