Sure, follow:
// Abstract class that is used by 2 child classes. The field that I am
talking about is Object object.
// Note that it works perfectly when persisted with EntityManager but when I
try to insert this object writing the bytes directly in the column (using
insert statement) toplink is not able to reconstruct the object later.
My entity class is simple like this:
@Entity
public class MyEntityExample implements Serializable {
private Long id;
private Serializable object;
@Id
public Long getId( ) {
}
public void setId( Long id ) {
this.setId(id);
}
public Serializable getObject( ) { return this.object; }
public void setObject(Serializable object) { this.object = object; }
So if I do that;
List<String> values = new ArrayList<String>();
values.add("a");
values.add("b");
MyEntityExample example = new MyEntityExample ();
example.setId(new Long(1));
manager.persist(example);
Everything work, I can easily get the object using:
List<String> values2 =
(List<String>) manager.find(MyEntityExample.class, new
Long(1)).getObject();
values.equals(values2); // true
But whether a try this approach:
CallableStatement cs = connection.prepareCall("INSERT INTO MyEntityExamle
(ID, OBJECT) VALUES(?, ?)");
cs.sestLong(1, new Long(1));
List<String> values = new ArrayList<String>();
values.add("a");
values.add("b");
ByteArrayOutputStream out = new ByteArrayOutputStream();
ObjectOutputStream objOut = new ObjectOutputStream(out);
objOut.writeObject( values );
InputStream stream = new ByteArrayInputStream(out.toByteArray());
cs.setBinaryStream(11, stream, out.toByteArray().length);
int res = cs.executeUpdate();
cs.close();
And later whether I try to load the above object using EntityManager using:
List<String> values2 =
(List<String>) manager.find(MyEntityExample.class, new
Long(1)).getObject();
I get de described error.
So which way do I need to write the serializable object so TopLink can
reconstruct it?
Thanks.
On 5/4/09 11:58 AM, "glassfish_at_javadesktop.org" <glassfish_at_javadesktop.org>
wrote:
> Can you post your entity class?
> [Message sent by forum member 'e3133d3' (e3133d3)]
>
> http://forums.java.net/jive/thread.jspa?messageID=344852
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