Does Jetty server require EhCache core library as dependency?

1. My Java application is using Jetty (v9.4) as server. I am wondering whether it requires ehcache-core as dependency for any reason such as Session management etc?

2. Would ehcache-core be required when the application is stateless?

Eclipse Jetty has no dependency on ehcache in any of it's components.

Session Management in Jetty.

• Server has a SessionIdManager
  • Manages each ServletContext (eg: each deployed webapp)
    • A SessionCache per ServletContext
      • A SessionDataStore per SessionCache

There's no real options for SessionIdManager there's just one implementation.

For SessionCache you have the following implementations in Jetty.

• If unconfigured, you'll have a DefaultSessionCache (which itself cannot be configured)
• session-cache-hash - will use an in memory HashMap to track sessions.
• session-cache-null - will not cache Session at ServletContext level (this is sometimes a very useful configuration, just means you'll lean more on the SessionDataStore)

The SessionCache can be specifically configured at each ServletContext, but it can also be configured at the Server level via a SessionCacheFactory implementation that will be used when a new webapp is deployed.

For SessionDataStore you have several implementations available.

• Null - no storage of Sessions (you rely on Cache only)

• File - Session persistence to disk

• JDBC - Session persistence to a DataSource

• Cache - Session persistence to Memcache

• GCloud - Session persistence to Google Cloud Storage

• Mongo - Session persistence to Mongo DB

• Infinispan - Session persistence to Infinispan