Flowable Server

The Flowable Server itself is a stateless application and therefore does not need any additional synchronization mechanisms between its nodes (such as cache synchronizing) except for the database.

The Flowable Engage Server is not fully stateless anymore as soon as WebSockets communication between browsers and the server is deactivated and long polling is used instead. This is because SockJS as a communication layer between browser and server then holds node dependent connection information. In this case sticky sessions need to be activated on the load balancer.