Re: [Resin-interest] Hibernate lazy loading with Quercus
Title: Vincent LAUGIER
Thank you very much !
the filter works fine.
We have added the following :
1. In web.xml :
TransactionPerRequestFilter
com.opticneo.filter.TransactionPerRequestFilter
TransactionPerRequestFilter
*.php
2. And the filter itself :
import java.io.IOException;
import javax.ejb.EJBException;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.transaction.SystemException;
import javax.transaction.UserTransaction;
import org.apache.log4j.Logger;
public class TransactionPerRequestFilter implements Filter {
private static Logger log =
Logger.getLogger(TransactionPerRequestFilter.class);
public void doFilter(ServletRequest request,
ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
UserTransaction ut = null ;
try {
Context context = new InitialContext();
ut = (javax.transaction.UserTransaction)
context.lookup("java:comp/UserTransaction");
ut.begin();
chain.doFilter(request, response);
ut.commit();
} catch (Exception ex) {
try {
ut.rollback();
} catch (SystemException syex) {
throw new EJBException
("Rollback failed: " + syex.getMessage());
}
throw new EJBException
("Transaction failed: " + ex.getMessage());
}
}
public void init(FilterConfig filterConfig) throws ServletException
{
log.debug("Initializing filter...");
}
public void destroy() {}
}
Vincent LAUGIER
Email : vincent.laug...@helmet.fr
Téléphone : + 33 (0)1 75 43 92 52
Fax : + 33 (0)1 79 75 01 12 (monfax.com)
Michael Rusch a écrit :
>> Seems that the objects no longer have the association with valid
session, so either the Session or PersistenceManager should be kept
around to fill the objects in upon use. Forcing eager load could also be
used I think.
>>
>> Alex.
Just noting that this can be done on the configuration level, or you can
do it using joins when you query for your objects.
> I assume the easiest route here is to use a Filter to achieve
> "session/transaction per request".
>
>
Along those same lines, you might also want to check out the "Open
Session in View" pattern, which is mentioned in a number of places in
the Hibernate docs:
https://www.hibernate.org/43.html
Michael
Alex wrote (2009-11-24 06:01):
Hello,
we try to do the following on our php/EJB3 application :
• find a given client from its lastname using a stateless bean ()
• load his orders using the getter
[code]
$clients = $client_eao->findBySample($sample_client,false,false);
var_dump($clients[0]->getOrders());
[/code]
Seems that the objects no longer have the association with valid session, so either the Session or PersistenceManager should be kept around to fill the objects in upon use. Forcing eager load could also be used I think.
Alex.
I assume the easiest route here is to use a Filter to achieve
"session/transaction per request".
We get the usual LazyInitializationException :
[10:41:03.300] {http--8080-6$31582617} org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.opticneo.entity.client.Client.orders, no session or session was closed
If we were using Hessian, before returning the list of clients we would have made a copy of the list (using beanlib) before it is serialized (in ordre to avoid LazyInitializationException)
With Quercus, we do not have to do this. Good ! But we face the LazyInitializationException again when trying to access the complex attributes.
What is the best way to handle this ? (maybe by taking control over the transaction from the php)
Thanks for your help.
Regards
--
Vincent LAUGIER
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Re: [Resin-interest] Hibernate lazy loading with Quercus
>> Seems that the objects no longer have the association with valid
session, so either the Session or PersistenceManager should be kept
around to fill the objects in upon use. Forcing eager load could also be
used I think.
>>
>> Alex.
Just noting that this can be done on the configuration level, or you can
do it using joins when you query for your objects.
> I assume the easiest route here is to use a Filter to achieve
> "session/transaction per request".
>
>
Along those same lines, you might also want to check out the "Open
Session in View" pattern, which is mentioned in a number of places in
the Hibernate docs:
https://www.hibernate.org/43.html
Michael
> Alex wrote (2009-11-24 06:01):
>>> Hello,
>>>
>>> we try to do the following on our php/EJB3 application :
>>> • find a given client from its lastname using a stateless bean ()
>>> • load his orders using the getter
>>>
>>> [code]
>>> $clients = $client_eao->findBySample($sample_client,false,false);
>>> var_dump($clients[0]->getOrders());
>>> [/code]
>>>
>>
>> Seems that the objects no longer have the association with valid session, so
>> either the Session or PersistenceManager should be kept around to fill the
>> objects in upon use. Forcing eager load could also be used I think.
>>
>> Alex.
>>
>
> I assume the easiest route here is to use a Filter to achieve
> "session/transaction per request".
>
>
>
>>> We get the usual LazyInitializationException :
>>> [10:41:03.300] {http--8080-6$31582617}
>>> org.hibernate.LazyInitializationException: failed to lazily initialize a
>>> collection of role: com.opticneo.entity.client.Client.orders, no session or
>>> session was closed
>>>
>>> If we were using Hessian, before returning the list of clients we would
>>> have made a copy of the list (using beanlib) before it is serialized (in
>>> ordre to avoid LazyInitializationException)
>>> With Quercus, we do not have to do this. Good ! But we face the
>>> LazyInitializationException again when trying to access the complex
>>> attributes.
>>>
>>> What is the best way to handle this ? (maybe by taking control over the
>>> transaction from the php)
>>>
>>> Thanks for your help.
>>>
>>> Regards
>>>
>>> --
>>> Vincent LAUGIER
>>>
>
>
>
>
>
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Re: [Resin-interest] Hibernate lazy loading with Quercus
Alex wrote (2009-11-24 06:01):
Hello,
we try to do the following on our php/EJB3 application :
• find a given client from its lastname using a stateless bean ()
• load his orders using the getter
[code]
$clients = $client_eao->findBySample($sample_client,false,false);
var_dump($clients[0]->getOrders());
[/code]
Seems that the objects no longer have the association with valid session, so
either the Session or PersistenceManager should be kept around to fill the
objects in upon use. Forcing eager load could also be used I think.
Alex.
I assume the easiest route here is to use a Filter to achieve
"session/transaction per request".
We get the usual LazyInitializationException :
[10:41:03.300] {http--8080-6$31582617}
org.hibernate.LazyInitializationException: failed to lazily initialize a
collection of role: com.opticneo.entity.client.Client.orders, no session or
session was closed
If we were using Hessian, before returning the list of clients we would have
made a copy of the list (using beanlib) before it is serialized (in ordre to
avoid LazyInitializationException)
With Quercus, we do not have to do this. Good ! But we face the
LazyInitializationException again when trying to access the complex attributes.
What is the best way to handle this ? (maybe by taking control over the
transaction from the php)
Thanks for your help.
Regards
--
Vincent LAUGIER
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Re: [Resin-interest] Hibernate lazy loading with Quercus
> Hello,
>
> we try to do the following on our php/EJB3 application :
> • find a given client from its lastname using a stateless bean ()
> • load his orders using the getter
>
> [code]
> $clients = $client_eao->findBySample($sample_client,false,false);
> var_dump($clients[0]->getOrders());
> [/code]
Seems that the objects no longer have the association with valid session, so
either the Session or PersistenceManager should be kept around to fill the
objects in upon use. Forcing eager load could also be used I think.
Alex.
>
> We get the usual LazyInitializationException :
> [10:41:03.300] {http--8080-6$31582617}
> org.hibernate.LazyInitializationException: failed to lazily initialize a
> collection of role: com.opticneo.entity.client.Client.orders, no session or
> session was closed
>
> If we were using Hessian, before returning the list of clients we would have
> made a copy of the list (using beanlib) before it is serialized (in ordre to
> avoid LazyInitializationException)
> With Quercus, we do not have to do this. Good ! But we face the
> LazyInitializationException again when trying to access the complex
> attributes.
>
> What is the best way to handle this ? (maybe by taking control over the
> transaction from the php)
>
> Thanks for your help.
>
> Regards
>
> --
> Vincent LAUGIER
> Email : vincent.laug...@helmet.fr
> Téléphone : + 33 (0)1 75 43 92 52
> Fax : + 33 (0)1 79 75 01 12 (monfax.com)
>
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[Resin-interest] Hibernate lazy loading with Quercus
Title: Vincent LAUGIER
Hello,
we try to do the following on our php/EJB3 application :
find a given client from its lastname using a stateless bean ()
load his orders using the getter
[code]
$clients = $client_eao->findBySample($sample_client,false,false);
var_dump($clients[0]->getOrders());
[/code]
We get the usual LazyInitializationException :
[10:41:03.300] {http--8080-6$31582617}
org.hibernate.LazyInitializationException: failed to lazily initialize
a collection of role: com.opticneo.entity.client.Client.orders, no
session or session was closed
If we were using Hessian, before returning the list of clients we would
have made a copy of the list (using beanlib) before it is serialized
(in ordre to avoid LazyInitializationException)
With Quercus, we do not have to do this. Good ! But we face the
LazyInitializationException again when trying to access the complex
attributes.
What is the best way to handle this ? (maybe by taking control over the
transaction from the php)
Thanks for your help.
Regards
--
Vincent LAUGIER
Email : vincent.laug...@helmet.fr
Téléphone : + 33 (0)1 75 43 92 52
Fax : + 33 (0)1 79 75 01 12 (monfax.com)
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