Re: dynamci Proxy: ClassCastException with Interfaces
Could you try rc4 CVS HEAD? Just a guess... - Original Message - From: Joerg Lensing To: OJB Users List Sent: Saturday, September 13, 2003 4:51 AM Subject: Re: dynamci Proxy: ClassCastException with Interfaces Edson Carlos Ericksson Richter wrote: Ok, I've not asked yet: what version of OJB are you using? I'm using rc 3 joerg - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.518 / Virus Database: 316 - Release Date: 11/9/2003
Re: dynamci Proxy: ClassCastException with Interfaces
Edson Carlos Ericksson Richter wrote: Ok, I've not asked yet: what version of OJB are you using? I'm using rc 3 joerg - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: dynamci Proxy: ClassCastException with Interfaces
Hi Carlos,
as you can see below, I nearly did the same you wrote, except that all
my classes/interfaces
extend java.io.Serializable.
joerg
Edson Carlos Ericksson Richter wrote:
Hi!
I'm using dynamic proxy and seen no problems at all (at least for rc3/rc4).
Let me show how I'm using.
I'll use sample you sent as base:
public interface AbstractPersistentIF {
public interface AbstractPersistentIF {
...
}
public interface PartnerIF extends AbstractPersistentIF {
public interface PartnerIF extends java.io.Serializable ,
AbstractPersistentIF {
...
}
public interface OrganisationIF extends PartnerIF {
public interface OrganisationIF extends java.io.Serializable , PartnerIF {
...
}
public interface PersonIF extends PartnerIF {
public interface PersonIF extends java.io.Serializable , PartnerIF {
...
}
public abstract class AbstractPersistentPO implements AbstractPersistentIF {
public abstract class AbstractPersistentPO implements
java.io.Serializable, AbstractPersistentIF {
...
}
public class PartnerPO extends AbstractPersistentPO implements PartnerIF {
public abstract class PartnerPO extends AbstractPersistentPO implements
PartnerIF, java.io.Serializable {
// this make PartnerPO can be cast to PartnerIF and AbstractPersistentIF.
}
public class OrganizationPO extends PartnerPO implements OrganizationIF {
public class OrganisationPO extends PartnerPO implements OrganisationIF,
java.io.Serializable {
// this makes OrganizationPO can be cast to OrganizationIF, PartnerIF and
AbstractPersistentIF
}
public class PersonPO extends PartnerPO implements PersonIF {
public class PersonPO extends PartnerPO implements PersonIF,
java.io.Serializable {
// this makes PersonPO can be cast to PersonIF, PartnerIF and AbstractPersistentIF.
}
All this said, you must guarantee that you have proxy=dynamic in you .xml defination file.
I use this with PB API (but AFAIK, is the same for OQL, that appear you are using), and works fine.
My2c,
Edson Richter
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Re: dynamci Proxy: ClassCastException with Interfaces
I've the two situation in my project. I have a documents table table has a fixed structure to all types of documents, and I have different tables for different objects, in another (a payment structure). All that works. I think you must specify that your interfaces extends others. The java.io.Serializable ins't necessary to work with OJB (but you may need it to work with another tech). But see. If you make AbstractPersistentIF extends java.io.Seralizable, all your interfaces (since they will extends AbstractPersistentIF) will be subclasses of java.io.Seralizable. AFAIK, your interfaces must extend the super-interfaces. Oh, in the .xml you must specify the class name, not interface name... I expect to help... Edson Richter - Original Message - From: Joerg Lensing To: OJB Users List Sent: Friday, September 12, 2003 5:22 AM Subject: Re: dynamci Proxy: ClassCastException with Interfaces hi carlos, did I say, that PersonPO and OrganisationPO are mapped to the same table? The do! joerg - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.516 / Virus Database: 313 - Release Date: 1/9/2003 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: dynamci Proxy: ClassCastException with Interfaces
Hi Edson
thanks for your reply. I'm still stuck :-(
Edson Carlos Ericksson Richter wrote:
I've the two situation in my project. I have a documents table table has a
fixed structure to all types of documents, and I have different tables for
different objects, in another (a payment structure).
All that works. I think you must specify that your interfaces extends
others. The java.io.Serializable ins't necessary to work with OJB (but you
may need it to work with another tech).
But see. If you make AbstractPersistentIF extends java.io.Seralizable, all
your interfaces (since they will extends AbstractPersistentIF) will be
subclasses of java.io.Seralizable.
I changed it. No difference!
The problem is, that the proxy-instance get the wrong interfaces for the
class in question.
see eclipse watch-expression after this code:
[code]:
Criteria crit = new Criteria();
crit.addEqualTo(id, new Integer(pOID));
Query query = new QueryByCriteria(PartnerPO.class, crit);
PartnerIF partner = (PartnerIF)broker.getObjectByQuery(query);
if (broker.hasClassDescriptor(partner.getClass())) {
tx.lock(partner, org.odmg.Transaction.READ);
}
[watch-expression]:
Class[] Class[] test = partner.getClass().getInterfaces();= Class[4]
(id=175)
Class [0]= Class (de.softcon.webcontrol.business.model.PersonIF)
(id=106)
Class [1]= Class
(de.softcon.webcontrol.business.model.AbstractPersistentIF) (id=94)
Class [2]= Class (java.io.Serializable) (id=95)
Class [3]= Class (de.softcon.webcontrol.business.model.PartnerIF)
(id=107)
---snip--
As you can see, the proxy doesn't show the expected interface
OrganisationIF.
(The field id has a table-field value of an OrganisationPO (I know
this is OK, because
before used proxies, this has been OK)
joerg
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Re: dynamci Proxy: ClassCastException with Interfaces
Why do you think that the partner object should support OrganizationIF? It's
perfectly reasonable that it does not, for some configurations of data/classes.
Furthermore, if you load it using dynamic proxies, you've said I want to treat
this as a PartnerIF the fact that the real object behind the scenes might
implement a other interfaces is not relevant.
David
|-+---
| | Joerg Lensing |
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| | nsing.de |
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| | 09/11/2003 09:02|
| | AM |
| | Please respond |
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| | List |
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--|
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|To: OJB Users List [EMAIL PROTECTED]
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|cc:
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|Subject: dynamci Proxy: ClassCastException with Interfaces
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--|
hi all,
I'm using dynamic proxies for these classes
look at this Interface/class-hierarchy:
AbstractPersistentIF
|_PartnerIF
|_OrganisationIF
|_PersonIF
(PO: persistent/mapped objects)
AbstractPersistentPO
|_PartnerPO
|_OrganisationPO
|_PersonPO
if i query an organisation:
snip
public PartnerIF getPartnerByOID(int pOID,Transaction tx) {
// obtain a broker instance from the current transaction
HasBroker hasBroker = (HasBroker) tx;
PersistenceBroker broker = hasBroker.getBroker();
Criteria crit = new Criteria();
crit.addEqualTo(id, new Integer(pOID));
Query query = new QueryByCriteria(PartnerPO.class, crit);
PartnerIF partner = (PartnerIF)broker.getObjectByQuery(query);
if (broker.hasClassDescriptor(partner.getClass())) {
tx.lock(partner, org.odmg.Transaction.READ);
}
return partner;
}
snip
if i test the implemented interfaces for the queried class
(--partner.getClass().getIntefaces();), it doesn't show the right
implemented interface. The class shoud show OrganisationIF, but shows
PersonIF as being implemented by this class
who can help?
tx joerg
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Re: dynamci Proxy: ClassCastException with Interfaces
Hi David,
[EMAIL PROTECTED] wrote:
Why do you think that the partner object should support OrganizationIF? It's
perfectly reasonable that it does not, for some configurations of data/classes.
yes. but the object in question does support the OrganizationIF . Take a
look at the code:
-snip---
// class definition
public class OrganisationPO extends PartnerPO implements
OrganisationIF, java.io.Serializable {
snip
the queried object is a of type OrgansiationPO. (Because before
switching to dynamic proxy, this class
was of this type)
joerg
Furthermore, if you load it using dynamic proxies, you've said I want to treat
this as a PartnerIF the fact that the real object behind the scenes might
implement a other interfaces is not relevant.
David
|-+---
| | Joerg Lensing |
| | [EMAIL PROTECTED]|
| | nsing.de |
| | |
| | 09/11/2003 09:02|
| | AM |
| | Please respond |
| | to OJB Users |
| | List |
| | |
|-+---
--|
|
|
|To: OJB Users List [EMAIL PROTECTED]
|
|cc:
|
|Subject: dynamci Proxy: ClassCastException with Interfaces
|
|
|
--|
hi all,
I'm using dynamic proxies for these classes
look at this Interface/class-hierarchy:
AbstractPersistentIF
|_PartnerIF
|_OrganisationIF
|_PersonIF
(PO: persistent/mapped objects)
AbstractPersistentPO
|_PartnerPO
|_OrganisationPO
|_PersonPO
if i query an organisation:
snip
public PartnerIF getPartnerByOID(int pOID,Transaction tx) {
// obtain a broker instance from the current transaction
HasBroker hasBroker = (HasBroker) tx;
PersistenceBroker broker = hasBroker.getBroker();
Criteria crit = new Criteria();
crit.addEqualTo(id, new Integer(pOID));
Query query = new QueryByCriteria(PartnerPO.class, crit);
PartnerIF partner = (PartnerIF)broker.getObjectByQuery(query);
if (broker.hasClassDescriptor(partner.getClass())) {
tx.lock(partner, org.odmg.Transaction.READ);
}
return partner;
}
snip
if i test the implemented interfaces for the queried class
(--partner.getClass().getIntefaces();), it doesn't show the right
implemented interface. The class shoud show OrganisationIF, but shows
PersonIF as being implemented by this class
who can help?
tx joerg
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