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Override id generation strategy [Spring] [Hibernate]  RSS feed

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I'm working on a project with Spring 2.5.6 and Hibernate 3.6.3. In every environment we're using sequences to generate Integer id for all our entities so :

But in my unit tests I'd like to use an in memory database like HSQL-DB and use an auto_increment so I would need to replace it by @GeneratedValue(strategy=GenerationType.IDENTITY).

How can I override that annotation only for unit tests ?

I'm already having a different spring configuration so I probably should be able to initialize a session factory that read XML definitions instead of annotations but how ?

Here is the spring configuration for my sessionFactory :

It's seems that I can easily override it according to that : http://docs.jboss.org/hibernate/annotations/3.5/reference/en/html/xml-overriding.html but how could I configure spring to configure hibernate so that it reads those files ?
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