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is there a way invalidate the entire cache in eclipselink periodically (say every 5mins).
can this be done in a property in the persistence.xml file ?
You can set a cache invalidation timeout on each entity,
See the @Cache annotation.
You could use a SessionCustomizer to iterate over all descriptors and set a default on all of them.
You could also use the JpaCache API at runtime to invalidate the entire cache. You could use an EJB timer to call this.