To find which Transaction Manager gets loaded among multiple transaction managers when @transactional is called

Question

Have some legacy code having transaction management defined in 2 configuration files as

1.  <tx:annotation-driven transaction-manager="transactionManager1" mode="aspectj" /> 
2. <tx:annotation-driven transaction-manager="transactionManager2" mode="aspectj" />

Have a method as follows

@Transactional
public void addDoc(param doc) throws customException {
}

Know Transaction qualifier should have been used here. But it has not been used. Is there any way to find which transaction-manager is being used when @Transactional gets called. Are there any JAR classes which can show this.

Thanks