Version: 9.4.19.v20190610 |

Non-Persistent Sessions
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## Non-Persistent Sessions

Non-clustered, non-persistent, in-memory-only is the default style of session management. In previous versions of Jetty this was referred to as "hash" sessions, as they were stored in a `HashMap` in memory.

This is delivered by a combination of the `DefaultSessionCache` (to keep sessions in memory) and a `NullSessionDataStore` (to avoid session persistence).

If you do nothing, Jetty will instantiate one of each of these objects for each context at startup time using hard-coded defaults.

To explicitly set up non-persisted sessions using modules, use both the `session-cache-hash` and the `session-store-null` modules.

Enabling the modules allows you to configure behavior - see the L1 Session Cache for detailed information on configuration options for the `DefaultSessionCache`. The `NullSessionDataStore` has no customizable options.

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