Panel-ready Java Specialist questions for freshers and experienced developers. Practice at Coding Cadre in Faridabad, or Online from Delhi NCR.
A transaction groups statements so they commit or roll back together.
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Runnable run returns void and cannot throw checked exceptions.
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Client idempotency keys stored with first response.
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Heap dumps, allocation profiles, and class histograms.
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Additive fields, explicit versioning, and deprecation windows.
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Request id, route, status, error type, and safe context — never passwords or full cards.
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Expand-contract: add column, dual-write, backfill in batches, switch reads, then drop old.
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