JPA isn't loading relations

JPA isn't loading relations

I have several OneToMany relations in an entity.
@OneToMany(cascade = CascadeType.ALL, mappedBy = "url")
private List<Squrlimage> squrlimagelist;
and
@JoinColumn(name = "URL", referencedColumnName = "ID", insertable = false,
updatable = false)
@ManyToOne(optional = false)
private Url url;
However, the relations doesn't load. It always gives a null value in the
entity. What's wrong with the code? My other relations work fine. Thank
you.