@Basic(fetch=FetchType.LAZY)
    @Lob
    @Column(name="file_content")
    private byte[] fileContent;

public class FileContent extends AbstractItem implements JsonItem {

	@Id
	@Column(name = "id_file")
	private Long id;

	@Basic(fetch=FetchType.LAZY)
    @Lob
    @Column(name="content_data")
    private byte[] contentData;

...

	@JoinColumn(name = "id", insertable=false, updatable=false)
        @OneToOne(optional = true, cascade=CascadeType.ALL)
	private FileContent fileContent;

    @JoinColumn(name = "id", insertable=false, updatable=false)
    @OneToOne(optional = true, cascade=CascadeType.ALL),[b] fetch = FetchType.LAZY)[/b]
	private FileContent fileContent;