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I have two entities: @Entity public class File ....... @Id @GeneratedValue(strategy=GenerationType.AUTO) private int id; @OneToMany(fetch=FetchType.LAZY, mappedBy="file", cascade=CascadeType.ALL) private List<Tag> tags; ....... OTHER PROPERTIES ....... @Entity public class Tag ....... @Id @GeneratedValue(strategy=GenerationType.AUTO) private int id; @ManyToOne @JoinColumn(name="file_id") private File file; @Column private String tag; ....... OTHER PROPERTIES ....... I am trying to insert into File (and subsequently Tag) by doing the following: File file = new File(); Tag tag = new Tag(); tag.setTag("tag1"); Tag2 tag2 = new Tag(); tag2.setTag("tag2"); List<Tag> tags = new ArrayList<Tag>(); tags.add(tag); tags.add(tag2); file.setTags(tags); ---Add other file attributes here--- I am then inserting the file in my DAO using: sessionFactory.getCurrentSession().saveOrUpdate(file); In my logs I see an insert into my "file" table and 2 inserts into my tag table, however, the foreign key in my tag table that points to my file table (file_id) is NULL. What could I possibly be doing wrong?

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