How does Spring handle transactions?
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Spring handles transactions using its declarative and programmatic transaction management features, built on top of the Spring Transaction Abstraction. This abstraction allows developers to manage transactions consistently across different underlying transaction technologies (like JDBC, JPA, Hibernate, JTA) without tying the code to a specific API.
Here’s how Spring manages transactions:
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Transaction Abstraction
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Spring provides a common interface (
PlatformTransactionManager) that hides implementation details of the underlying transaction system. -
This ensures that whether you use JDBC, Hibernate, or JPA, transaction handling remains consistent.
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Declarative Transaction Management (Most Common)
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Enabled via the
@Transactionalannotation. -
Developers specify transaction boundaries at the method or class level without writing explicit transaction code.
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Spring uses AOP proxies (Aspect-Oriented Programming) to intercept calls to annotated methods, start a transaction before method execution, and commit or roll back based on success or failure.
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Rollback rules can be configured (e.g., rollback for runtime exceptions but not checked exceptions, unless specified).
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Programmatic Transaction Management
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Developers can control transactions explicitly using
TransactionTemplateorPlatformTransactionManager. -
This approach provides fine-grained control but is less commonly used because it introduces boilerplate code.
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Propagation and Isolation
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Spring allows configuration of transaction propagation (e.g., REQUIRED, REQUIRES_NEW, NESTED) to define how transactions behave when a method is called within an existing transaction.
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It also supports isolation levels (e.g., READ_COMMITTED, SERIALIZABLE) to handle concurrency and consistency requirements.
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Rollback Rules
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By default, transactions roll back on unchecked (runtime) exceptions.
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Developers can customize rollback behavior using attributes in
@Transactional.
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✅ In short: Spring manages transactions by abstracting underlying APIs, letting developers use annotations for simplicity, while still providing flexibility for advanced use cases.
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