@OneToMany Set organizationMemberCollection的值中检索到null：
UserAccount.java：@Entity
@Table(name="USER_ACCOUNT")
public class UserAccount {
@Id
@Column(name = "id", nullable = false)
@SequenceGenerator(name = "generator", sequenceName = "USER_ACCOUNT_id_seq", allocationSize=1)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "generator")
private Long id;
@Column(name = "EMAIL", nullable = false)
private String email;
@Column(name = "PASSWORD_HASH")
private String passwordHash;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "userAccount")
private Set <OrganizationMember> organizationMemberCollection;
...
/*
* getters and setters
*/
}
以下是“拥有”该关联的对象：
OrganizationMember.java：
@Entity
@Table(name="ORGANIZATION_MEMBER")
public class OrganizationMember{
@Id
@Column(name = "id", nullable = false)
@SequenceGenerator(name = "generator", sequenceName = "ORGANIZATION_MEMBER_id_seq", allocationSize=1)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "generator")
private Long id;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "USER_ACCOUNT_ID", nullable = false)
private UserAccount userAccount;
...
/*
* getters and setters
*/
}
在这个应用程序中，我们有两个不同的配置：
生产环境，其中Hibernate连接到PostgreSQL数据库。 以下是生产环境的sessionFactory配置：
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean"> <property name="hibernateProperties"> <props> <prop key="hibernate.jdbc.batch_size">10</prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.cglib.use_reflection_optimizer">false</prop> </props> </property> ... </bean>测试环境，其中Hibernate连接到内存中的HSQLDB数据库：
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean"> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">org.hibernate.dialect.HSQLDialect</prop> <prop key="hibernate.show_sql">false</prop> <prop key="hibernate.cglib.use_reflection_optimizer">false</prop> <prop key="hibernate.hbm2ddl.auto">create-drop</prop> <prop key="hibernate.cache.use_second_level_cache">false</prop> <prop key="hibernate.cache.use_query_cache">false</prop> </props> </property> ... </bean>
这个问题只在测试配置中出现；在生产配置中一切都很顺利，我可以获得集合。
然而，在测试配置中获取UserAccount时，organizationMemberCollection属性返回null（不是一个空的Set）。
经过几个小时的通过Google和Hibernate文档的研究后，我仍然没有找到任何与相同问题/行为有关的帖子，所以我有点迷失了，需要帮助！
如果需要，我当然可以提供更多信息，谢谢！
编辑：
突出显示问题的测试：
@Test
@Transactional
public void testFindUserAccount_OrganizationMemberCollectionFetching() {
assertNotNull(userAccountDao.findUserAccount("user1@test.fr")); //NoProblem
assertNotNull(userAccountDao.findUserAccount("user1@test.fr").getCabinetMemberCollection()); //Fails
}
以下是与 findUserAccount 相关的 DAO
public UserAccount findUserAccount(String email) {
if (email == null) {
return null;
}
UserAccount userAccount = (UserAccount) this.sessionFactory
.getCurrentSession().createCriteria(UserAccount.class)
.add(Restrictions.eq("email", email).ignoreCase())
.uniqueResult();
if (userAccount == null) {
throw new ObjectNotFoundException("UserAccount.notFound");
} else {
return userAccount;
}
}