Middleware servers can maintain shared lists of user sessions and other objects and coordinate invalidation of caches. cuba.cluster.enabled property should be enabled on each server to achieve this. Example of the tomcat/conf/app-core/local.app.properties file is shown below:

For the Middleware servers, correct values of the cuba.webHostName, cuba.webPort and cuba.webContextName properties should be specified to form a unique Server ID.

Interaction mechanism is based on JGroups. It is possible to fine-tune the interaction using the jgroups.xml file located in the root of cuba-core-<version>.jar. It can be copied to tomcat/conf/app-core and configured as needed.

ClusterManagerAPI bean provides the program interface for servers interaction in the Middleware cluster. It can be used in the application – see JavaDocs and examples in the platform code.