On a project we use Spring + Hibernate + JPA + HSQL.

Using Hibernate 4.2.x (until 4.2.15) we have no problem.
Using Hibernate 4.3.x the bean creation is throwing an OutOfMemoryException, from the following line :

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager" p:entityManagerFactory-ref="entityManagerFactory" />
<tx:annotation-driven transaction-manager="transactionManager" />