使用：Glassfish 3.1.2、EclipseLink。
次の3つのクラスのJPAモデルがあります。
@Entity public class Customer implements Serializable {
@Id private Integer id;
@OneToOne(cascade={CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REMOVE}, orphanRemoval=true)
private Person person;
[...]
@Entity public class Person implements Serializable {
@Id private Integer id;
[...]
@Entity public class Request implements Serializable {
@Id private Integer id;
@ManyToOne private Person person;
次の戦略で顧客を削除しようとしています（CMTを使用）。
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="MyPU" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="eclipselink.ddl-generation" value="create-tables"/>
<property name="eclipselink.ddl-generation.output-mode" value="database"/>
<property name="eclipselink.logging.level" value="FINE"/>
<property name="eclipselink.logging.parameters" value="true"/>
<property name="eclipselink.logging.logger" value="DefaultLogger"/>
<property name="eclipselink.logging.timestamp" value="true"/>
<property name="eclipselink.logging.session" value="false"/>
<property name="eclipselink.logging.thread" value="false"/>
</properties>
</persistence-unit>
[...]
@PersistenceContext(unitName="MyPU")
private EntityManager entityManager;
@Resource private SessionContext context;
[...]
public void delete(Entity object) {
try{
object = this.getEntityManager().merge(object);
this.getEntityManager().remove(object);
} catch (Exception e){
this.context.setRollbackOnly();
}
}
CustomerオブジェクトがRequestにアタッチされているPersonオブジェクトにアタッチされている場合、 Personの削除カスケードは失敗し、トランザクションはロールバックされますが、Customerはデータベースから削除されます。次のエラーが表示されます。
INFO: [EL Fine]: 2012-12-28 10:53:38.1--Connection(27132168)--DELETE FROM CUSTOMER WHERE (ID = ?)
bind => [97]
INFO: [EL Fine]: 2012-12-28 10:53:38.125--Connection(27132168)--DELETE FROM PERSON WHERE (ID = ?)
bind => [111]
INFO: [EL Fine]: 2012-12-28 10:53:38.126--SELECT 1
WARNING: DTX5014: Caught exception in beforeCompletion() callback:
Local Exception Stack:
INFO: [EL Warning]: 2012-12-28 10:53:38.127--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: org.postgresql.util.PSQLException: ERRO: atualização ou exclusão em tabela "person" viola restrição de chave estrangeira "fk_request_person_id" em "request"
Detalhe: Chave (id)=(111) ainda é referenciada pela tabela "request".
Error Code: 0
Call: DELETE FROM PERSON WHERE (ID = ?)
bind => [111]
Query: DeleteObjectQuery(111)
[...]
SEVERE: javax.ejb.EJBException: Transaction aborted
[...]
では、カスケード削除が失敗した場合、どうすれば顧客の削除をキャンセルできますか？