Transaction NOT Rollback for RuntimeException

Hi
We use Spring' JpaTransactionManager with hiberate persistence.xml using LocalContainerEntityManagerFactoryBean. I tried to rollback a transaction by explicitly throwing a Runtime excpetion. But all the data in 3 different JPA Entities is committed.

How to rollback a transaction using Spring+JPA+Hibernate?

Thanks in adv

Please use the search as this question has been answered numerous times before...

If your transactions aren't rolling back either your setup is wrong our you use a database that doesn't support transactions (MySQL with MyISAM tables for instance).