When I try to iterate over a collection of embeddable objects, I get the
following exception:
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to
com.kryterion.wa.core.model.ftp.FtpSubdirectory
I'm very confused by this...I have the Pro JPA 2 book and closely followed
its example of the Employee class and its element collection of embeddable
Vacation bookings.
When I look at the collection while debugging, I see that the subdirectories
field is an ArrayList proxy which has a field called elementData, which is
an Object array. When I inspect the first element of this Object array, I
see that it too is an Object array with three string elements (the path,
type, and description values). Basically, I don't see that OpenJPA loaded up
a collection of FtpSubdirectory objects as I would've expected, and hence
the class cast exception.
My mappings:
@Entity
@Table(name = "core_ftp_connection")
public class FtpConnection extends AbstractMultiNamedEntity {
private static final long serialVersionUID = 1L;
...
@ElementCollection(targetClass = FtpSubdirectory.class, fetch =
FetchType.EAGER)
@CollectionTable(name = "core_ftp_subdir", joinColumns =
@JoinColumn(name = "fk_ftp_connection_id"))
private Collection<FtpSubdirectory> subdirectories = new
ArrayList<FtpSubdirectory>();
...
and
@Embeddable
public class FtpSubdirectory {
@Column(name = "path")
private String path;
@Column(name = "type")
@Enumerated(EnumType.STRING)
private SubdirectoryType type;
@Column(name = "description")
private String description;
public String getPath() {
return path;
}
...
--
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