Declarative transaction management has minimum impact on the application code and, therefore, is an idealistic lightweight container.
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@Transactional(readOnly = true)
public class DefaultFooService implements FooService {
public Foo getFoo(String fooName) {
// do something
}
// these settings have precedence for this method
@Transactional(readOnly = false, propagation = Propagation.REQUIRES_NEW)
public void updateFoo(Foo foo) {
// do something
}
}