Understanding Thread Safety of Hibernate Session Objects

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问题:

Is Session a thread-safe object in Hibernate?

回答:

In Hibernate, the Session object is not thread-safe. Each Session instance is designed to be used by a single thread at a time. This means that you should not share a Session instance between multiple threads. Doing so can lead to unpredictable behavior, data corruption, and exceptions.

To ensure thread safety, you should create a new Session for each unit of work (e.g., a single transaction or a single request in a web application). This approach allows each thread to have its own Session instance, which can safely manage its own state and transactions.

If you need to manage multiple threads, consider using a SessionFactory, which is thread-safe and can be shared across threads. The SessionFactory is responsible for creating Session instances, and you can obtain a new Session from it whenever needed.

In summary:

  • Session: Not thread-safe; use one per thread.
  • SessionFactory: Thread-safe; can be shared across threads to create Session instances.