Eviction and Expiration are something different. Which is often mixed by accident in RHDG.
The example shows the configuration of eviction with but contains element as well which is a different thing.
I'm not sure whether expiration is supported for the hibernate 2L caching.
If supported it should be explained in a different section and removed in this example.
If not supported it should be removed and the configuration should be rejected as there could be unexpected and unwanted results otherwise!

Reported by: rhn-support-wfink

https://access.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.4/html/configuration_guide/configuring_high_availability#annotations:2acd0e7f-a6b8-4ba4-983a-f3531865dc0e