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About persistence unit

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25

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
24

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
24

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
Manual
24

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 ... "); The createEntityManagerFactory static method expects a persistence unit name as an argument
JPA Doc
24

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
JPA Doc
24

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
22

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
22

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
21

javax.persistence.NamedQuery

javax.persistence Annotation NamedQuery Target: Classes Specifies a static, named query in the Java Persistence query language. Query names are scoped to the persistence unit. The NamedQuery ... of a named query in the Java Persistence query language: @NamedQuery( name
Manual
20

JPA Named Queries

class. But since the scope of named queries is the entire persistence unit, names should be selected ... the listing of managed classes in a persistence unit definition is to support named queries. Notice ... must be available. ObjectDB makes the definition of a persistence unit optional. Named queries