Hi all,
I have two entities, City and Country, with accessType=AccessType.FIELD, having
ManyToOne relationship:
COUNTRY ENTITY BEAN
| package test.entity.bean;
| import javax.persistence.*;
|
| @Entity(access=AccessType.FIELD)
| @Table(name = "COUNTRY")
| public class Country implements java.io.Serializable
| {
| @Id
| @Column(name="ID")
|
| private int id;
| @Column(name="NAME")
| private String name;
|
| public int getId() { return this.id; }
| public void setId(int id) { this.id = id; }
|
| public String getName() { return this.name; }
| public void setName(String name) { this.name = name; }
| }
|
CITY ENTITY BEAN
| package test.entity.bean;
| import javax.persistence.*;
|
| @Entity(access=AccessType.FIELD)
| @Table(name = "CITY")
| public class City implements java.io.Serializable
| {
|
| @Id
| @Column(name="ID")
| private int id;
|
| @Column(name="NAME")
| private String name;
|
| @ManyToOne( targetEntity=Country.class, fetch=FetchType.LAZY )
| @JoinColumn(name = "COUNTRY", nullable = true)
| private Country country;
|
| public City() {}
|
| public int getId() { return this.id; }
| public void setId(int id) { this.id = id; }
|
| public String getName() { return this.name; }
| public void setName(String name) { this.name = name; }
|
| public Country getCountry() { return this.country; }
| public void setCountry(Country country) { this.country = country; }
|
| }
|
and a client that reads city.id, city.name and city.countryId only:
REMOTE CLIENT
| ...
| City city = sb.getCity(cityId);
| System.out.println(city.getId());
| System.out.println(city.getName());
| System.out.println(city.getCountry().getId()); // <-- throws
LazyInitializationException
| ...
|
So, when I try to access city.getCountry().getId() from remote client, I get a
org.hibernate.LazyInitializationException: could not initialize proxy - no
Session Exception
The strange thing is that, if I change the entity beans accessType to
AccessType.PROPERTY, then this example seems to work fine!
So my question is:
- Is this the right way to get the ID from a related entity bean in a Lazy
relationship?
- If yes, why doesn't it work for AccessType=FIELD entity beans? Is it a bug?
- If no, which is the right way to do it? (of course, loading the entire
related entity is not an option, since my real classes are much more
complicated. I just want to get the related entity's ID only)
Note: I have some reasons to use AccessType=FIELD, so changing my EntityBeans
to AccessType=PROPERTY is not an option either
View the original post :
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3917149#3917149
Reply to the post :
http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3917149
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