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From David Blevins <>
Subject Re: No Maven2 Best Practices?
Date Fri, 09 May 2008 22:30:02 GMT

On May 9, 2008, at 6:15 AM, Gegas wrote:

> David Blevins wrote:
>> Heh :)  It's not so stupid as we did put some fancy code for mapping
>> the datasources to your persistence.xml without which you might
>> actually need to have separate persistence.xmls.  But we work hard to
>> adapt things to the environment you setup so these kinds of issues  
>> are
>> avoided.  And then of course we went the extra mile to make sure you
>> could setup your entire environment right in your test case, config
>> file free, which is nice icing on the cake.  That also allows you to
>> shut off things like transaction or security processing, which can be
>> nice.  Well, technically you're turning *on* the mock transaction
>> manager and/or security service we provide, but you get the idea :)
> You did a very good job :-)

Thanks!  Really happy you like it.  Tell all your friends ;)

> David Blevins wrote:
>> The one thing that you really might want a different persistence.xml
>> for is maybe there is some JPA provider specific property you use in
>> production that you don't want enabled in test (or vice versa).  I
>> suspect that'll be a rare case, but it's certainly something to keep
>> an eye out for.
> I've found something that's a real case. The unit tests uses OpenEJB  
> and my
> production environment is JBoss. The property for TransactionManager  
> is
> different for test and production:
> OpenEJB
> hibernate.transaction.manager_lookup_class  =
> org.apache.openejb.hibernate.TransactionManagerLookup
> JBoss
> hibernate.transaction.manager_lookup_class =
> org.hibernate.transaction.JBossTransactionManagerLookup
> Now I really would need the ability to use a seperate  
> persistence.xml for
> testing.

Don't know why I didn't think of this before, but we could just add  
some support for checking and resetting that property if hibernate is  
your persistence provider.  Not sure why they make you set it in the  
first place, they could easily figure out which lookup strategy to use  
on their own.

In the meantime, you can use a custom lookup strategy like this:

import org.hibernate.HibernateException;
import org.hibernate.transaction.TransactionManagerLookup;
import javax.transaction.TransactionManager;
import java.util.Properties;

public class DynamicTransactionManagerLookup implements  
TransactionManagerLookup {

     private TransactionManagerLookup impl;

     public DynamicTransactionManagerLookup() {
         String[] strategies = {
         for (String className : strategies) {
             try {
                 Class<?> clazz =  
                 impl = (TransactionManagerLookup) clazz.newInstance();
             } catch (Exception e) {

         if (impl == null) throw new IllegalStateException("No  
TransactionManagerLookup available");

     public TransactionManager getTransactionManager(Properties  
properties) throws HibernateException {
         return impl.getTransactionManager(properties);

     public String getUserTransactionName() {
         return impl.getUserTransactionName();

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