Bug With Nested @Embeddable Objects?

scrotty · **Posted:** Thu Oct 26, 2006 11:32 am

I posted this on the main Hibernate forum two days ago (Oct 24) and just realized that this was the forum it should be in. Sorry for the cross-post.

Versions:
hibernate3.2cr4
hibernate-annotations-3.2cr2

The DDL that is generated via hdm2ddl from the following annotated classes is flawed:

Code:

@Entity
public final class A
{
    private B[] m_b;
    private long m_pk;
    
    @Id
    public long getPk()
    {
        return m_pk;
    }
    
    @CollectionOfElements
    @IndexColumn( name="A_b_index" )
    public B[] getB()
    {
        return m_b;
    }
}

@Embeddable
public final class B
{
    private C m_c;
    
    @Column( name="B_c" )
    public C getC()
    {
        return m_c;
    }
}

@Embeddable
public final class C
{
    private int m_int;
    
    @Column( name="C_int" )
    public int getInt()
    {
        return m_int;
    }
}

Here is the resulting DDL:

Code:

    create table A (
        pk bigint not null,
        primary key (pk)
    );

    create table A_b (
        A_pk bigint not null,
        m_int integer not null,
        A_b_index integer not null,
        primary key (A_pk, A_b_index)
    );

Why is the second row of table A_b using a column name of m_int? This is the private identifier for a class that is using method-level annotations. In fact, that class explicitly sets the column name to be C_int. This is not used.

Using @AttributeOverrides in class A or B also does not stick. The DDL keeps using the field name - and it should not.

This seems to be a consequence to referencing an Embedded object from within an Embedded object that is stored in an array. Unfortunately, that's exactly what I need to do in my real code.

Any thoughts? Is this a bug or am I missing something?

Thank you,
Sean

scrotty · **Posted:** Fri Oct 27, 2006 4:49 pm

Yes, I was afraid this issue would get little attention - a bit too much of an edge case for most. Unfortunately, this edge case is one that I need to exercise.

I'm pretty sure this is a bug in Hibernate. However, I don't know if it's in hibernate-annotations, hbm2ddl, or hibernate-core. I think be taking my first Hibernate spelunking trip. Wish me well.

I'll report back if I get back...

emmanuel · **Posted:** Tue Nov 07, 2006 6:05 pm

I would apreciate if you could post a runnign testcase to JIRA, it should work.
@Column( name="B_c" ) is wrong though

dmitchell · **Joined:** Sat Nov 26, 2005 4:02 pm **Posts:** 2

I just ran into this same problem, and the fix for me was to *explicitly* use the annotation "@AccessType("property") on the deepest embedded class.

The bug seems to be that, with a collection of embedded objects that contain embedded objects, for some reason the default access type gets assumed to be "field". You must specify "property" explicitly.

emmanuel · **Posted:** Mon Nov 13, 2006 6:17 pm

yes, but a running test case would help me fix that :-)

drach · **Joined:** Sun Jul 30, 2006 6:29 pm **Posts:** 1

I just got bit by this bug. It took most of a day to find this answer (first I had to figure out what to look for). Emmanuel has asked for a running test case a couple of times. Has that been provided? And if so, is there a filed bug report?