DefaultComponentSafeNamingStrategy not working

ge0ffrey · **Joined:** Thu Oct 13, 2005 4:19 am **Posts:** 98

Hi,

I am using Hibernate 3.1 with hibernate-annotations 3.1b7 (through a spring hibernate3 configuration without the entity manager).

The following code won't run:

Code:

@Entity
public class Person {

  private Dog firstDog;
  private Dog secondDog;

  // getters & setters for the firstDog and SecondDog
}

@Embeddable
public class Dog {
  
  private String dogName;

  // getters & setters for dogName
}

It gives me an exception :
Repeated column in mapping for entity: x.y.Person column: dogName

Yet I am using DefaultComponentSafeNamingStrategy, which according to the documentation should solve this problem:

"If you want to have the same embeddeable object type twice in the same entity, the column name defaulting will not work: at least one of the columns will have to be explicit. Hibernate goes beyond the EJB3 spec and allows you to enhance the defaulting mechanism through the NamingStrategy. DefaultComponentSafeNamingStrategy is a small improvement of the default EJB3NamingStrategy that allows embedded objects to be defaulted even if used twice in the same entity."

ge0ffrey · **Joined:** Thu Oct 13, 2005 4:19 am **Posts:** 98

I did some more tests, just found out that the above code will work,
but my code didn't because I used a @ManyToOne attribute in my Dog...

This is described in the documentation that it cannot be used in an Embeddable, which is a pity, because I kinda need it there :)

ge0ffrey · **Joined:** Thu Oct 13, 2005 4:19 am **Posts:** 98

Now beta 8 I have not problems: ManyToOne does work in Embeddable

emmanuel · **Posted:** Wed Feb 08, 2006 2:47 pm

right, I made some changes that "fixed" the issue. This is still not officially supported since I don't have any unit test on it, but I'm currintly writing some

ge0ffrey · **Joined:** Thu Oct 13, 2005 4:19 am **Posts:** 98

FYI

Since beta 8 I have no problems with:

An @Embeddable with a @ManyToOne(fetch = FetchType.EAGER) in an @Embeddable in a @Entity.

This feature makes for a very clean design, thanks :) Especially combined with the smart naming of embedded properties.
So the docs are currently wrong (it does work), but I hope it becomes a supported/documented/unitTested feature.

ivan2010 · **Joined:** Fri Feb 08, 2008 2:41 pm **Posts:** 18

How did you configure the namingStrategy? I am using Hibernate Annotations 3.4 and Spring 2.5 but am still getting a "Repeated column in mapping" error.

Code:

<bean id="mySessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
.......
        <property name="namingStrategy">
            <bean class="org.hibernate.cfg.DefaultComponentSafeNamingStrategy" />
        </property>
</bean>