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warnings about pc lifecycle in doc

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Gavin 2023-05-18 13:29:09 +02:00 committed by Christian Beikov
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documentation/src/main/asciidoc/introduction/Interacting.adoc
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@ -54,6 +54,18 @@ At any given moment, an instance may be associated with at most one persistence
The lifetime of a persistence context usually corresponds to the lifetime of a transaction, though it's possible to have a persistence context that spans several database-level transactions that form a single logical unit of work. The lifetime of a persistence context usually corresponds to the lifetime of a transaction, though it's possible to have a persistence context that spans several database-level transactions that form a single logical unit of work.
[WARNING]
====
A persistence context—that is, a `Session` or `EntityManager`—absolutely positively **must not be shared between multiple threads or between concurrent transactions.**
If you accidentally leak a session across threads, you will suffer.
====
.Container-managed peristence contexts
****
In a container environment, the lifecycle of a persistence context scoped to the transaction will usually be managed for you.
****
There are several reasons we like persistence contexts. There are several reasons we like persistence contexts.
1. They help avoid _data aliasing_: if we modify an entity in one section of code, then other code executing within the same persistence context will see our modification. 1. They help avoid _data aliasing_: if we modify an entity in one section of code, then other code executing within the same persistence context will see our modification.