About persistence unit

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23

Exception while accessing the Persistence unit ...?

for the Unit Name)   Thanks, Allen   Maybe the persistence.xml file has an error or maybe it is located in the wrong directory, because it seems that the persistence unit is unknown. Try repeating ... .com/xml/ns/persistence/persistence_2_0.xsd"> <persistence-unit name="GuestbookPU" transaction
JPA Doc
23

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
23

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
Forum
23

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
Manual
23

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
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
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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
20

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
JPA Doc
20

javax.persistence.metamodel.Metamodel

javax.persistence.metamodel Interface Metamodel Provides access to the metamodel of persistent entities in the persistence unit. Since: JPA 2.0 EmbeddableType embeddable(Class cls) Return the metamodel embeddable type representing the embeddable class. Return the metamodel embeddable type
JPA Doc
20

javax.persistence.NamedQueries

javax.persistence Annotation NamedQueries Target: Classes Specifies multiple named Java Persistence query language queries. Query names are scoped to the persistence unit. The NamedQueries annotation can be applied to an entity or mapped superclass. Since: JPA 1.0 See Also: NamedQuery Learn