Feedback driven development

All modern software development methodologies are focused on increasing the feedback and taking advantage of it. One of the fundamental assumptions is that trying something out (getting feedback) is more valuable than the cost of doing it wrong. This works fairly well if we are getting quick and reliable feedback. However, does this equation still apply if we are not getting timely/quality feedback?

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Implementing uniqueness validation in JPA

One of the typical things one often needs is uniqueness validation across Entities. For example making sure that each user account has unique username. Implementing this check is somewhat complicated in JPA/Hibernate because they will send pending changes in current Unit of Work (EntityManager, Session) to database before executing any queries against same Entity.
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