From Java Doesn’t Suck – You’re Just Using it Wrong: Sticky sessions and server state are usually one of the best ways to kill your performance and resilience. Session state (in the traditional Servlet sense) makes it really hard to do Continuous Delivery and scale horizontally. If you want a session cache use a real cache system – something that was designed to deal with multi-node use and failure. e.g. Memcache, ehcache, etc. In-memory caches are fast but hard to invalidate in multi-node environments and are not durable across restarts – they have their place, like calculated / derived properties where invalidation and recalculation are easy.
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