About persistence unit

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Forum
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The project does not contain a persistence unit

a persistence unit, but NetBeans produces this warning because a persistence unit is required by JPA. Although your application should work well with ObjectDB with no persistence unit, you may have to add a persistence unit definition in a persistence.xml file to your project, in order to remove
JPA Doc
31

javax.persistence.spi.PersistenceProvider

". Returns: EntityManagerFactory for the persistence unit specified by the metadata Since: JPA 1.0 ... is to be created. Parameters: emName - the name of the persistence unit map - a Map of properties ... for the persistence unit, or null if the provider is not the right provider Since: JPA 1.0 ProviderUtil
JPA Doc
31

javax.persistence.EntityManagerFactory

factory for the persistence unit. When the application has finished using the entity manager ... an instance of Metamodel interface for access to the metamodel of the persistence unit. Return an instance of Metamodel interface for access to the metamodel of the persistence unit. Returns: Metamodel
JPA Doc
31

javax.persistence.PersistenceContext

of the persistence unit as defined in the persistence.xml file. (Optional) The name of the persistence unit as defined in the persistence.xml file. If the unitName element is specified, the persistence unit ... javax.persistence Annotation PersistenceContext Target: Classes and fields (including property
Manual
31

Obtaining a JPA Database Connection

to get an EntityManager instance. JPA requires the definition of a persistence unit in an XML file in order ... persistence unit in an XML file or you can simply provide the file path of the ObjectDB database ... is considered by ObjectDB to be a database url rather than a persistence unit name. The $objectdb
JPA Doc
31

javax.persistence.PersistenceUnit

get methods) Expresses a dependency on an EntityManagerFactory and its associated persistence unit ... ) The name of the persistence unit as defined in the persistence.xml file. (Optional) The name of the persistence unit as defined in the persistence.xml file. If specified, the persistence unit
JPA Doc
30

javax.persistence.SharedCacheMode

unit. Corresponds to the value of the persistence.xml shared-cache-mode element, and returned as ... for the persistence unit. Caching is disabled for the persistence unit. Since: JPA 2.0 ... javax.persistence Enum SharedCacheMode java.lang.Object java.lang.Enumpersistence
JPA Doc
29

createEntityManagerFactory(persistenceUnitName)

(   String persistenceUnitName ) Create and return an EntityManagerFactory for the named persistence unit. Parameters: persistenceUnitName - the name of the persistence unit Returns: the factory that creates EntityManagers configured according to the specified persistence unit Since: JPA 1.0
JPA Doc
29

createEntityManagerFactory(persistenceUnitName, properties)

persistence unit using the given properties. Parameters: persistenceUnitName - the name of the persistence unit properties - Additional properties to use when creating the factory. The values ... that creates EntityManagers configured according to the specified persistence unit. Since: JPA 1.0
JPA Doc
28

javax.persistence.ValidationMode

javax.persistence Enum ValidationMode java.lang.Object java.lang.Enumpersistence.ValidationMode> javax.persistence.ValidationMode Implemented Interfaces: Serializable, Comparable The validation mode to be used by the provider for the persistence unit. Since: JPA