[Persistence, JBoss/CMP, Hibernate, Database] - bidirectional OneToMany throws LazyInitializationException
by beligum
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
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19Â years