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About IdClass

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JPA Doc
7

MapKey.name

is a composite primary key and is mapped as IdClass, an instance of the primary key class is used as the key. Default value: "" Since: JPA 1.0
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4

Conflicting modifiers .... (javax.persistence.Id, javax.persistence.ManyToOne)

a Map, and uses a Compound Primary Key. The contained class therefore uses an @IdClass. This all works ... ; import javax.persistence.Id; import javax.persistence.IdClass; import javax.persistence.ManyToOne; import javax.persistence.Version; @Entity @IdClass(CompoundKeyMapItem.CompoundKeyMapItemId.class
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3

EmbeddedId with Generated field value

I know the following 2 ways to declare a composite Primary key: ********* Solution 1 ********* @Entity @IdClass(CompositePK.class) public class A {     @Id private long uid;     @Id private ... objects (and not for embeddable classes). Consider using: @IdClass(ZoneId.class) @Entity public static
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2

em.flush(); em.clear(); loosing data and not persisting managed objects

method  of @IdClass and multiple @Id fields and a non annotated POJO as shown in the manual   I doubt
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2

Object explorer cannot open odb file. ObjectDB many-to-many relationship

") @MapKey     private Map assignements; } @Entity @IdClass
Issue
2

ObjectDb Doctor : Failed to locate set method for field property com.test.Video$VideoId.sourceId using reflection (error 316)

") @IdClass(Video.VideoId.class) public class Video { protected String provider; protected
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2

ODB with Netbeans

. "An entity or IdClass class should implement the java.io.Serializable interface