About xml

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javax.jdo.annotations.Serialized

javax.jdo.annotations Annotation Serialized Target: Fields (including property get methods) Annotation on a member (field or property) to indicate that the member is stored serialized. Such a member cannot be queried using JDOQL. Corresponds to xml attribute "serialized" in "field" and "property
JDO Doc
2

javax.jdo.annotations.Transactional

javax.jdo.annotations Annotation Transactional Target: Fields (including property get methods) Annotation to indicate that a member (field or property) is transactional but not persistent. This corresponds to xml attribute persistence-modifier="transactional" of "field" and "property" elements
JDO Doc
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javax.jdo.annotations.Unique

constraint violations. Corresponds to the xml element "unique". Since: JDO 2.1 Column[] columns Columns
JDO Doc
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javax.jdo.annotations.Value

javax.jdo.annotations Annotation Value Target: Fields (including property get methods) Annotation for the value of a map relation. Corresponds to the xml element "value". Since: JDO 2.1 String column Name of the column to store the value in. Name of the column to store the value in. Returns
JDO Doc
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javax.jdo.annotations.Version

javax.jdo.annotations Annotation Version Target: Classes Annotation for the versioning of the class. Corresponds to the xml element "version" of the "class" and "property" elements. Since: JDO 2.1 String column Name of the column for the version. Name of the column for the version. Returns
JDO Doc
2

javax.jdo.FetchGroup

. This category includes members defined in the default fetch group in xml or annotations. Redefining
JPA Doc
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javax.persistence.Cacheable

javax.persistence Annotation Cacheable Target: Classes Specifies whether an entity should be cached if caching is enabled when the value of the persistence.xml caching element is ENABLE_SELECTIVE or DISABLE_SELECTIVE. The value of the Cacheable annotation is inherited by subclasses
JPA Doc
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javax.persistence.MappedSuperclass

the AttributeOverride and AssociationOverride annotations or corresponding XML elements. Example
Forum
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mapping file is not being loaded

.   here is my persistence.xml xml version="1.0" encoding="UTF-8"?>
JPA Doc
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PersistenceContext.unitName

Annotation Element javax.persistence.PersistenceContext String unitName (Optional) The name of the persistence unit as defined in the persistence.xml file. If the unitName element is specified, the persistence unit for the entity manager that is accessible in JNDI must have the same name. Default value: "" Since: JPA 1.0