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TCS/Infosys/JPMorgan round: How does @Transactional actually work internally — proxy creation, self-invocation pitfall, wrong exception type, wrong propagation. Walk through all three failure modes.

One of the most commonly asked service-based-company questions — tests whether you understand the proxy mechanism, not just the annotation's existence.

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TCS/Infosys/JPMorgan round: How does @Transactional actually work internally — proxy creation, self-invocation pitfall, wrong exception type, wrong propagation. Walk through all three failure modes.

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