11:15 p.m.
Infinite loop occurs while doing findById on a Parent domain Object having OneToMany
relationship with child domain with composite primary key
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Key: ANN-846
URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-846
Project: Hibernate Annotations
Issue Type: Improvement
Affects Versions: 3.4.0.GA
Environment: Hibernate Annotations 3.4.0.GA, HSqlDB and Oracle
Reporter: RAMESH BABU NL
Attachments: Organization.java, OrganizationApplications.java,
OrganizationApplicationsPK.java
We are using Hibernate annotations version 3.4.0.G.A
We are establishing a OneToMany relationship using the annotation @OnetoMany for a Parent
and Child domain objects
where the child domain has a composite primary key.
We have two domain objects
Organization [Parent]
OrganizationApplications [Child]
We want to have a OnetoMany relationship between Organization and
OrganizationApplications.
As shown below OrganizationApplications contains a composite primary key, of two
columns(Organization Id, ApplicationId[foreignkey from other table called APPLICATIONS])
Organizations.java
-------------------
@OneToMany(targetEntity=gov.osc.enrollment.backend.domain.OrganizationApplications.class,
cascade=CascadeType.ALL, fetch = FetchType.EAGER,
mappedBy="id.organization")
private Set<OrganizationApplications> organizationApps = new
HashSet<OrganizationApplications>();
OrganizationApplications.java
---------------------------------------------------------------------
public class OrganizationApplications extends EnvelopeInfo implements Serializable {
private static final long serialVersionUID = 1L;
@EmbeddedId
private OrganizationApplicationsPK id;
public OrganizationApplicationsPK getId() {
return id;
}
public void setId(OrganizationApplicationsPK id) {
this.id = id;
}
OrganizationApplicationsPK.java
---------------------------------------------------------------------
@Embeddable
public class OrganizationApplicationsPK implements Serializable {
private static final Long serialVersionUID = 1L;
public OrganizationApplicationsPK() {
super();
}
@ManyToOne
@JoinColumn(name="APPLICATION_ID",nullable=false)
private Applications application;
@ManyToOne(targetEntity=gov.osc.enrollment.backend.domain.Organization.class,
cascade=CascadeType.ALL)
@JoinColumn(name="ORGANIZATION_ID",
referencedColumnName="ORGANIZATION_ID", nullable=false, insertable=true,
updatable=true)
private Organization organization;
public Applications getApplication() {
return application;
}
public void setApplication(Applications application) {
this.application = application;
}
public Organization getOrganization() {
return organization;
}
public void setOrganization(Organization organization) {
this.organization = organization;
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
if ( ! (o instanceof OrganizationApplicationsPK)) {
return false;
}
OrganizationApplicationsPK other = (OrganizationApplicationsPK) o;
return (this.getOrganization().getId() == other.getOrganization().getId())
&& (this.getApplication().getId() == other.getApplication().getId());
}
@Override
public int hashCode() {
final int prime = 31;
int hash = 17;
hash = hash * prime + ((int) (this.getOrganization().getId() ^
(this.getOrganization().getId() >>> 32)));
hash = hash * prime + ((int) (this.getApplication().getId() ^
(this.getApplication().getId() >>> 32)));
return hash;
}
}
Please see the attached java files for complete code and also the exception stack trace.
Questions:
1. When we do a findById query on Organization table the system goes into infinite loop
and never gets out .
How ever we are able to insert a record in Organization and its child
OrganizationApplications.
2. In the Organization.java domain, if you notice we are using
mappedby="id.organization". Is this a valid mapping ?
If not why does this parameter work for insert and not for a
entityManager.findById, doing so leads to infinite loop.
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