About value

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Manual
11

Database Schema Evolution

entity object is initialized using the value of the matching old field in the original entity object ... with default values (0, false or null). Fields in the old schema that do not have matching fields in the new ... with a default value (0, false or null). The following type conversions are supported: From any numeric type
Manual
11

Entity Management Settings

specifies enhancement related settings: The agent attribute (whose value is "true" or "false ... can manage non enhanced classes by using reflection at the cost of performance. The possible values ... the persistence context of the EntityManager (which serves as a first level cache). The valid values are "weak
JPA Doc
11

javax.persistence.metamodel.EmbeddableType

getCollection(String name) Return the Collection-valued attribute of the managed type that corresponds to the specified name. Return the Collection-valued attribute of the managed type that corresponds ... > elementType) Return the Collection-valued attribute of the managed type that corresponds
JPA Doc
11

javax.persistence.metamodel.EntityType

the Collection-valued attribute of the managed type that corresponds to the specified name. Return the Collection-valued attribute of the managed type that corresponds to the specified name. Parameters ... the Collection-valued attribute of the managed type that corresponds to the specified name and Java element
JPA Doc
11

javax.persistence.metamodel.IdentifiableType

the Collection-valued attribute of the managed type that corresponds to the specified name. Return the Collection-valued attribute of the managed type that corresponds to the specified name. Parameters ... the Collection-valued attribute of the managed type that corresponds to the specified name and Java element type
JPA Doc
11

javax.persistence.metamodel.ManagedType

(String name) Return the Collection-valued attribute of the managed type that corresponds to the specified name. Return the Collection-valued attribute of the managed type that corresponds ... ) Return the Collection-valued attribute of the managed type that corresponds to the specified name
JPA Doc
11

javax.persistence.metamodel.MappedSuperclassType

Since: JPA 2.0 CollectionAttribute getCollection(String name) Return the Collection-valued attribute of the managed type that corresponds to the specified name. Return the Collection-valued attribute ... > getCollection(String name, Class elementType) Return the Collection-valued attribute
Forum
11

Error 363 - Failed to read value of inverse relationship

.persistence.PersistenceException Failed to read the value of field com.pvdc.model.entity.EEvent ... .UserException: Failed to read the value of field com.pvdc.model.entity.EEvent.town using reflection at com ... the value of field property edu.um.fcsit.jpa.entity.Guest.phoneList using enhanced method (error 362
JPA Doc
11

javax.persistence.criteria.MapJoin

> attribute) Create a fetch join to the specified collection-valued attribute using an inner join. Create a fetch join to the specified collection-valued attribute using an inner join. Parameters: attribute ...  attribute) Create a fetch join to the specified single-valued attribute using an inner join
Manual
10

Paths and Types in JPQL and Criteria API

. But more often they are used in JPQL path expressions that navigate to values of simple types (number, boolean, string, date). Simple type values are more useful in queries. They have special operators ... ) and uses the dot (.) operator to navigate through persistent fields to other objects and values