getSharedCacheMode() - JPA PersistenceUnitInfo's method

Returns the specification of how the provider must use a second-level cache for the persistence unit. The result of this method corresponds to the shared-cache-mode element in the persistence.xml file.
the second-level cache mode that must be used by the provider for the persistence unit
JPA 2.0

This documentation page is derived (with some adjustments) from the open source JPA 2 RI (EclipseLink)
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
Object Relational Mapping (ORM) JPA 2 providers include Hibernate, EclipseLink, TopLink, OpenJPA and DataNucleus.
ObjectDB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.