Java Reference
In-Depth Information
To specify that an entity must not be cached, add a
@Cacheable
annotation and set it to
false
:
@Cacheable(false)
@Entity
public class OrderStatus { ... }
When the
ENABLE_SELECTIVE
cache mode is set, the persistence provider will cache
any entities that have the
@Cacheable(true)
annotation and any subclasses of that
entity that have not been overridden. The persistence provider will not cache entities
that have
@Cacheable(false)
or have no
@Cacheable
annotation. That is, the
ENABLE_SELECTIVE
mode will cache only entities that have been explicitly marked
for the cache using the
@Cacheable
annotation.
When the
DISABLE_SELECTIVE
cache mode is set, the persistence provider will cache
any entities that
do not
have the
@Cacheable(false)
annotation. Entities that do not
have
@Cacheable
annotations, and entities with the
@Cacheable(true)
annotation
will be cached. That is, the
DISABLE_SELECTIVE
mode will cache all entities that have
not been explicitly prevented from being cached.
If the cache mode is set to
UNDEFINED
, or is left unset, the behavior of entities annotated
with
@Cacheable
is undefined. If the cache mode is set to
ALL
or
NONE
, the value of
the
@Cacheable
annotation is ignored by the persistence provider.
Specifying the Cache Mode Settings to Improve Performance
To adjust the cache mode settings for a persistence unit, specify one of the cache modes as
the value of the
shared-cache-mode
element in the
persistence.xml
deploy-
ment descriptor (shown in
bold
):
<persistence-unit name="examplePU" transaction-type="JTA">
<provider-
>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>jdbc/__default</jta-data-source>
<shared-cache-mode>DISABLE_SELECTIVE</shared-cache-mode>
</persistence-unit>
