Hi,
I am looking for is some usage examples of session-per-thread model in a
JSE environment while using JPA in Spring Framework environment.
To elaborate the requirements:
1. Must use ApplicationContext in a JSE environment (not
WebApplicationContext)
2. A pair of Spring Beans B1, B2 each scoped as 'prototype' is injected with
@PersistenceContext EntityManager em;
3. This is the implementation of B1:
public class B1 {
@PersistenceContext EntityManager em;
@Transactional
public EntityManager getEntityManager() {
return em;
}
Same is B2.
4. Now, by session-per-thread model, I mean, the following assertion must
satisfy when called from the same thread:
// call B1, B2 from same thread
EntityManager em1 = b1.getEntityManager();
EntityManager em2 = b2.getEntityManager();
assert em1 == em2;
assert em1.getDelegate() == em2.getDelegate();
Interestingly, I am seeing the first assertion pass but the second
fail. While what I want is the second assertion to pass because em1, em2 are
mere proxy while em1.getDelegate() is the actual OpenJPA EntityManager.
5. The application context uses
org.springframework.orm.jpa.JpaTransactionManager
and org.springframework.orm.jpa.LocalEntityManagerFactoryBean.
Question:
1. Is it possible to do get such a session-per-thread model via Spring
configuration only or one must develop some custom code?
2. Can someone point me to code samples where similar session-per-thread
model is attempted?
3. A TransactionSynchronizationManager exists in Spring codebase ... that
seems to address the issue of binding a resource with a key -- any pointer
to its usage?
Thanks in advance --
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