Spring Deep Dive: Transactions

Short summary

A practical deep dive into Spring Boot transactions covering atomicity, isolation levels, and proxy-based transaction management. Explains dirty reads, non-repeatable reads, and phantom reads with clear examples, then maps each isolation level from READ_UNCOMMITTED to SERIALIZABLE. Includes code examples for @Transactional annotations with isolation, readOnly, and timeout settings.

• •Spring proxies intercept method calls to manage begin/commit/rollback automatically
• •Isolation levels range from READ_UNCOMMITTED to SERIALIZABLE; Postgres upgrades loosest levels via MVCC
• •Use readOnly for queries and timeout for contended rows to avoid stuck locks

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