[id='jpa_cache_store']
= JPA Cache Stores
JPA (Java Persistence API) cache stores, `JpaStore`, use formal schema to
persist data. Other applications can then read from persistent storage to load
data from {brandname}. However, other applications should not use persistent
storage concurrently with {brandname}.

When using `JpaStore`, you should take the following into consideration:

* Keys should be the ID of the entity. Values should be the entity object.
* Only a single `@Id` or `@EmbeddedId` annotation is allowed.
* Auto-generated IDs with the `@GeneratedValue` annotation are not supported.
* All entries are stored as immortal.
* `JpaStore` does not support segmentation.

.Declarative configuration

[source,xml,options="nowrap",subs=attributes+]
----
include::config_examples/persistence_jpa_store.xml[]
----

[options="header"]
|===
| Parameter | Description
| `persistence-unit`
| Specifies the JPA persistence unit name in the JPA configuration file, `persistence.xml`, that contains the JPA entity class.

| `entity-class`
| Specifies the fully qualified JPA entity class name that is expected to be stored in this cache. Only one class is allowed.
|===

.Programmatic configuration

[source,java]
----
include::code_examples/ConfigJpaStore.java[]
----

[options="header"]
|===
| Parameter | Description
| `persistenceUnitName`
| Specifies the JPA persistence unit name in the JPA configuration file, `persistence.xml`, that contains the JPA entity class.

| `entityClass`
| Specifies the fully qualified JPA entity class name that is expected to be stored in this cache. Only one class is allowed.
|===

.Reference

* link:{configdocroot}infinispan-cachestore-jpa-config-{schemaversion}.html[JPA cache store configuration schema]
* link:{javadocroot}/org/infinispan/persistence/jpa/JpaStore.html[JpaStore]
* link:{javadocroot}/org/infinispan/persistence/jpa/configuration/JpaStoreConfiguration.html[JpaStoreConfiguration]
//Community only
ifndef::productized[]
* link:https://github.com/infinispan/infinispan/blob/master/persistence/jpa/src/test/java/org/infinispan/persistence/jpa/configuration/JpaConfigurationTest.java[JPA Cache Store test]
* link:https://github.com/infinispan/infinispan/blob/master/persistence/jpa/src/test/resources/config/jpa-config.xml[JPA Cache Store test configuration]
endif::productized[]
