Spring @Transactional does not work in JUnit test?

I am using Spring 3.2 and JUnit 4.

My Dao class is as follows:

@Transactional public class SomeDaoImpl implements SomeDao {

The update operations on this work if executed directly from web application. However, I am seeing that junit integration tests that exercise the update methods do not actually persist the changes. Is something rolling the transactions back when junit methods are executed?

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