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A few tips on working with Hibernate Sessions (all gleaned from https://developer.atlassian.com/confdev/development-resources/confluence-architecture/hibernate-sessions-and-transaction-management-guidelines)
- Hibernate sessions are not thread-safe
- Therefore, any new DSpace code must ensure it is not attempting to share objects or Sessions between threads. Instead, pass around UUIDs, so the new thread can load the referenced object in a new Session.
- The more objects you load during the lifetime of a Session, the less efficient each query will be
- So, be sure to use
Context.commit()orContext.uncacheEntity()when you are done with an object
- So, be sure to use
- Because Hibernate has built-in Session caching, it is not recommended to cache objects elsewhere in your code. If you must perform other caching, store UUIDs instead
- Caching objects elsewhere is likely to result in a
LazyInitializationExceptionif the object (cached elsewhere) outlives its Session. See "Common Hibernate Error Messages" below.
- Caching objects elsewhere is likely to result in a
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