Hibernate ObjectNotFoundException, even if records are present in table - mysql

Question

I am working on a Spring MVC app in which there are two model classes: LocationModel and ContactModel. Below is the code:
#Entity
#Table(name="Contact")
public class ContactModel {
#Id
#Column(name="contactid")
#GeneratedValue
private int contactId;
#Column(name="contactname")
private String contactName;
#Column(name="contactemail")
private String email;
#Column(name="contactphone")
private String phone;
#ManyToOne
#JoinColumn(name="locationid")
private LocationModel locationModel;
}
#Entity
#Table(name="Location")
public class LocationModel {
#Id
#Column(name="locationid")
#GeneratedValue
private int locationId;
#Column(name="locationname")
private String locationName;
#Column(name="locationdesc")
private String locationDescription;
#Column(name="type")
private String locationType;
#Column(name="address")
private String address;
#Column(name="state")
private String state;
#Column(name="circle")
private int circle;
#Column(name="district")
private int district;
#Column(name="town")
private int town;
#Column(name="lattitude")
private String lattitude;
#Column(name="longitude")
private String longitude;
#Column(name="locationuid")
private String locationUID;
#Column(name="category")
private String category;
#Column(name="bedcount")
private int bedCount;
#OneToMany(mappedBy = "locationModel", fetch = FetchType.EAGER)
private List<ContactModel> contactList;
}
Primary key in location table is foreign key in contact table. I have 2 records in contact table, with location id 0.
I am using following code for getting contact list:
Session session = sessionFactory.getCurrentSession();
Query query = session
.createQuery("from ContactModel where contactName like :contactName");
return query.setParameter("contactName", contactName + "%").list();
But it shows exception:
Error performing load command : org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.bizmerlin.scm.model.LocationModel#0]
17:03:31,135 ERROR [stderr] (http--127.0.0.1-9090-2) org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.bizmerlin.scm.model.LocationModel#0]
17:03:31,139 ERROR [stderr] (http--127.0.0.1-9090-2) at org.hibernate.internal.SessionFactoryImpl$1$1.handleEntityNotFound(SessionFactoryImpl.java:247)
17:03:31,141 ERROR [stderr] (http--127.0.0.1-9090-2) at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:214)
17:03:31,143 ERROR [stderr] (http--127.0.0.1-9090-2) at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:264)
Perhaps it is due to that fact that location table has no record with location id 0. If so, how can I get contact list, even if their location is null?

Answer 1

Use optional attribute
#ManyToOne(optional=true)
#JoinColumn(name="locationid")
private LocationModel locationModel;
http://learningviacode.blogspot.in/2011/12/one-to-many-assocition-that-is-optional.html