私はさまざまなことを試しました。たとえば、最も単純なものです。
// Value object
@Embeddable
@NoSql(dataFormat=DataFormatType.MAPPED)
public class Attribute implements Serializable {
@Basic
private String someProp;
// ... getter/setter omitted
}
@Entity
@NoSql(dataFormat=DataFormatType.MAPPED)
public class FancyEntity implements Serializable {
@Id
@GeneratedValue
@Field(name="_id")
private String id;
@ElementCollection
private Map<String,Attribute> attributes = new HashMap<>();
// ... getter/setter omitted
}
しかし、これはエラーを生成します:
Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.4.1.v20120825fb0a20b): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [myPersistenceUnit] failed.
Internal Exception: java.lang.ClassCastException: org.eclipse.persistence.eis.mappings.EISCompositeCollectionMapping cannot be cast to org.eclipse.persistence.mappings.foundation.MapComponentMapping
at org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:221)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.createPredeployFailedPersistenceException(EntityManagerSetupImpl.java:1541)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:1532)
at org.eclipse.persistence.jpa.PersistenceProvider.createContainerEntityManagerFactory(PersistenceProvider.java:208)
何か案が?
Glassfish3.1.2で最新の2.4.1-SNAPSHOTを使用しています。
解決
@MapKeyアノテーションを追加し、埋め込み可能なクラス内で目的のキーフィールドを選択します。
@ElementCollection
@MapKey(name="name")
private Map<String,Attribute> attributes = new HashMap<>();