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Editorial Team
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Asked: 2026-05-13T19:55:28+00:00

I’m facing a problem with Hibernate. My current project is a little game. In

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I’m facing a problem with Hibernate.
My current project is a little game. In this game you have a Board which has many Fields each with a Token.
I can make a select on an empty database without any problems but if I put one object into it (saving works without any exceptions and after it the database values looks good) I’m getting exceptions.
The interesting part in the Board class:

@OneToMany(fetch=FetchType.EAGER)
@MapKey(name = "point")
public Map<Point, Field> getGameMatrix() {
     return gameMatrix;
}

My query for getting the boards:

return getHibernateTemplate().loadAll(Board.class);

The log now comes up with this:

Hibernate: select this_.id as id0_2_,
this_.uniqueClassName as
uniqueCl3_0_2_, this_.borderDimension
as borderDi4_0_2_, this_.dimension as
dimension0_2_, this_.TYPE as TYPE0_2_,
gamematrix2_.Board_id as Board1_4_,
field3_.id as gameMatrix2_4_, (select
a11.point from Field a11 where
a11.id=gamematrix2_.gameMatrix_id) as
formula0_4_, field3_.id as id1_0_,
field3_.point as point1_0_,
field3_.token_id as token3_1_0_,
token4_.id as id2_1_, token4_.name as
name2_1_, token4_.uniqueClassName as
uniqueCl4_2_1_, token4_.TYPE as
TYPE2_1_ from Board this_ left outer
join Board_Field gamematrix2_ on
this_.id=gamematrix2_.Board_id left
outer join Field field3_ on
gamematrix2_.gameMatrix_id=field3_.id
left outer join Token token4_ on
field3_.token_id=token4_.id

Until there it looks good, but then Hibernate does the following:

Hibernate: delete from Board_Field where Board_id=?  
Hibernate: insert into Board_Field (Board_id, gameMatrix_id) values (?, ?)

And I got this exception:

Exception in thread “AWT-EventQueue-0”
org.springframework.dao.InvalidDataAccessApiUsageException:
object references an unsaved transient
instance – save the transient instance
before flushing: Field; nested
exception is
org.hibernate.TransientObjectException:
object references an unsaved transient
instance – save the transient instance
before flushing: Field

I’m not understanding why it makes the delete statement.
Any ideas?
thanks

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1 Answer

  1. Editorial Team

    A workmate of mine had a similar problem. He’s not now but the thing was related to database integrity.

    It seems Hibernate had more constraints defined that the database. When it loaded some data, Hibernate saw that some record in the database must not exist, and tried to delete it.

    Try to check if some should-be-but-not-defined foreign key is being violated and try to make consistent the data.

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