#ManyToOne Lazy loading not working - jpa

Question

I've seen other posts about this problem, but have found no answer to my own troubles. I have
#Entity
#Table(name= ServerSpringConstants.COMPANY)
public class Company implements Serializable {
private static final long serialVersionUID = -9104996853272739161L;
#Id #GeneratedValue(strategy=GenerationType.AUTO)
#Column (name = "companyID")
private long companyID;
#OneToMany (targetEntity = Division.class, cascade = {
CascadeType.PERSIST,
CascadeType.MERGE,
CascadeType.REFRESH},
fetch = FetchType.EAGER)
#JoinTable (name = "companyDivisionJoinTable",
joinColumns = #JoinColumn(name="companyID"),
inverseJoinColumns = #JoinColumn(name="divisionID")
)
private Set<Division> divisions = new HashSet<>();
public long getCompanyID() {
return companyID;
}
public Set<Division> getDivisions() {
return divisions;
}
public void setDivisions(Set<Division> divisions) {
this.divisions = divisions;
}
}
On the other side:
#Entity
#Table(name= ServerSpringConstants.DIVISION)
public class Division implements Serializable {
private static final long serialVersionUID = -3685914604737207530L;
#Id
#GeneratedValue(strategy= GenerationType.AUTO)
#Column(name = "divisionID")
private long divisionID;
#ManyToOne
(fetch = FetchType.LAZY, optional = false, targetEntity = Company.class,
cascade = {CascadeType.PERSIST, CascadeType.MERGE
}
)
#JoinColumn(name="companyID", referencedColumnName = "companyID")
private Company company;
public long getDivisionID() {
return divisionID;
}
public void setDivisionID(long divisionID) {
this.divisionID = divisionID;
}
public Company getCompany() {
return company;
}
public void setCompany(Company company) {
this.company = company;
}
}
Yet for some reason, LAZY loading not working. I'm using JPA. I'm calling back the companies, and their enclosing divisions from within a 'User' class -- the pertinent part
#ManyToMany (targetEntity = Company.class,
cascade={
CascadeType.PERSIST,
CascadeType.MERGE,
CascadeType.REFRESH},
fetch=FetchType.EAGER )
#JoinTable (
name="companyUserJoinTable",
joinColumns=#JoinColumn(name="userID"),
inverseJoinColumns=#JoinColumn(name="companyID")
)
private Set<Company> company = new HashSet<>();
I've searched out existing threads, and have tried adding various suggestions, but nothing has helped!
Any help appreciated.
Thanks!

Answer 1

Since you are loading the divisions set eagerly (with fetch = FetchType.EAGER) and you have a bidirectional association, divisions will be initialized with the parent reference to company. I can't see any problem with it. Jpa loaded the full object tree because you just told it so. A company contains divisions which contain a back reference to the company that loaded them.
To understand it better, since the reason for lazy loading is to reduce the data loaded from database, the owning company is already loaded in session for the divisions, so why not setting the association too?
The #ManyToOne association on the other side takes effect if you load divisions first.
To be more correct with your mapping add also a #MappedBy attribute to the one part of the association. This does not affect fetching behavior but will prevent double updates to the database issued by both ends of the association.