bidirectional OneToMany throws LazyInitializationException
Hi all,
I've a specific problem with my EJB3 Hibernate code (using Seam, but I don't think this has anything to do with it).
This is my case:
I have a superclass entity bean: DefaultAccessControlList
@Entity
@Table(name="access_control_list")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(
name="type",
discriminatorType=DiscriminatorType.STRING
)
@DiscriminatorValue("default")
public class DefaultAccessControlList implements Serializable
{
//-----CONSTANTS-----
private static final long serialVersionUID = -1406511547129599450L;
//-----VARIABLES-----
protected int id;
//-----CONSTRUCTORS-----
public DefaultAccessControlList()
{
}
//-----GETTERS/SETTERS------
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
public int getId()
{
return id;
}
protected void setId(int id)
{
this.id = id;
}
with two subclasses:
@Entity
@Name("principalAccessControlList")
@DiscriminatorValue("principal")
public class PrincipalAccessControlList extends DefaultAccessControlList implements Serializable
{
//-----CONSTANTS-----
private static final long serialVersionUID = -6044077966387630697L;
//-----VARIABLES-----
private Inode inode;
//-----CONSTRUCTORS-----
public PrincipalAccessControlList()
{
}
//-----GETTERS/SETTERS------
@ManyToOne(targetEntity=AbstractInodeImpl.class)
@JoinColumn(name="inode")
public Inode getInode()
{
return inode;
}
public void setInode(Inode inode)
{
this.inode = inode;
}
}
and
@Entity
@Name("groupAccessControlList")
@DiscriminatorValue("group")
public class GroupAccessControlList extends DefaultAccessControlList implements Serializable
{
//-----CONSTANTS-----
private static final long serialVersionUID = -2681771597593712778L;
//-----VARIABLES-----
private Inode inode;
//-----CONSTRUCTORS-----
public GroupAccessControlList()
{
}
//-----GETTERS/SETTERS------
/**
* Note: this side is the owner side of this relationship
*/
@ManyToOne(targetEntity=AbstractInodeImpl.class)
@JoinColumn(name="inode")
public Inode getInode()
{
return inode;
}
public void setInode(Inode inode)
{
this.inode = inode;
}
}
These beans are the owning side of the Inode-ACL relationship, and the Inode (abstract) class is like this:
@Entity
@Table(name="inode")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(
name="type",
discriminatorType=DiscriminatorType.STRING
)
public abstract class AbstractInodeImpl implements Inode
{
...
@OneToMany(mappedBy="inode")
public List<PrincipalAccessControlList> getPrincipalAccessControlLists()
{
return principalAccessControlLists;
}
public void setPrincipalAccessControlLists(List<PrincipalAccessControlList> principalAccessControlLists)
{
this.principalAccessControlLists = principalAccessControlLists;
}
@OneToMany(mappedBy="inode")
public List<GroupAccessControlList> getGroupAccessControlLists()
{
return groupAccessControlLists;
}
public void setGroupAccessControlLists(List<GroupAccessControlList> groupAccessControlLists)
{
this.groupAccessControlLists = groupAccessControlLists;
}
...
}
The problem is that, when I fetch an Inode-object, the reverse-relationship methods getGroupAccessControlLists() and getPrincipalAccessControlLists() are mixed up, and one of them throws an "org.hibernate.LazyInitializationException: illegal access to loading collection" exception when accessed.
Any ideas?
bram
