It was a high performance web application (website) of a big airline company hosting their enterprise content site.
We use ehcache internally to cache the objects / even HTML fragments for faster rendering.
Static Content (HTML), we cache it indefinitely and ensure that the cache is flushed by the Content Management Server responsible to publish content. It creates a JMS message and pushes the message into a TOPIC configured within WebLogic App Server. Within the application there is generic Cache listener which listens to the topic and receive the message and acts accordingly.
Since the app is deployed in a cluster all cluster nodes receive the message from the topic.