我正在尝试在 Spring 项目中使用 ehcache/hibernate 缓存延迟加载的集合。当我执行 session.get(Parent.class, 123) 并多次浏览孩子时，每次都会执行查询以获取孩子。仅第一次查询父项，然后从缓存中解析。
可能我错过了一些东西，但我找不到解决方案。请参阅下面的相关代码。
我正在使用 Spring (3.2.4.RELEASE) Hibernate(4.2.1.Final) 和 ehcache(2.6.6)
父类：
@Entity
@Table(name = "PARENT")
@Cacheable
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE, include = "all")
public class Parent implements Serializable {
/** The Id. */
@Id
@Column(name = "ID")
private int id;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "parent")
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
private List<Child> children;
public List<Child> getChildren() {
return children;
}
public void setChildren(List<Child> children) {
this.children = children;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Parent that = (Parent) o;
if (id != that.id) return false;
return true;
}
@Override
public int hashCode() {
return id;
}
}
子类：
@Entity
@Table(name = "CHILD")
@Cacheable
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE, include = "all")
public class Child {
@Id
@Column(name = "ID")
private int id;
@ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
@JoinColumn(name = "PARENT_ID")
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
private Parent parent;
public int getId() {
return id;
}
public void setId(final int id) {
this.id = id;
}
private Parent getParent(){
return parent;
}
private void setParent(Parent parent) {
this.parent = parent;
}
@Override
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final Child that = (Child) o;
return id == that.id;
}
@Override
public int hashCode() {
return id;
}
}
应用上下文：
<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>
<value>Parent</value>
<value>Child</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.SQLServer2008Dialect</prop>
<prop key="hibernate.hbm2ddl.auto">validate</prop>
<prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
<prop key="hibernate.connection.charSet">UTF-8</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
<prop key="hibernate.use_sql_comments">true</prop>
<!-- cache settings ehcache-->
<prop key="hibernate.cache.use_second_level_cache">true</prop>
<prop key="hibernate.cache.use_query_cache">true</prop>
<prop key="hibernate.cache.region.factory_class"> org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory</prop>
<prop key="hibernate.generate_statistics">true</prop>
<prop key="hibernate.cache.use_structured_entries">true</prop>
<prop key="hibernate.cache.use_query_cache">true</prop>
<prop key="hibernate.transaction.factory_class"> org.hibernate.engine.transaction.internal.jta.JtaTransactionFactory</prop>
<prop key="hibernate.transaction.jta.platform"> org.hibernate.service.jta.platform.internal.JBossStandAloneJtaPlatform</prop>
</props>
</property>
</bean>
我正在运行的测试用例：
@Test
public void testGetParentFromCache() {
for (int i = 0; i <3 ; i++ ) {
getEntity();
}
}
private void getEntity() {
Session sess = sessionFactory.openSession()
sess.setCacheMode(CacheMode.NORMAL);
Transaction t = sess.beginTransaction();
Parent p = (Parent) s.get(Parent.class, 123);
Assert.assertNotNull(p);
Assert.assertNotNull(p.getChildren().size());
t.commit();
sess.flush();
sess.clear();
sess.close();
}
在日志记录中，我可以看到第一次执行 2 个查询以获取父级和获取子级。此外，日志显示子实体和集合都存储在二级缓存中。但是，在读取集合时，将执行查询以在第二次和第三次尝试时获取子项。
由于 EHCache 无法正常工作，我们也尝试了 infinispan（具有不同的并发级别）。不幸的是，我们一直遇到同样的问题。
PS 这个问题也在 EHCache 论坛： http://forums.terracotta.org/forums/posts/list/8785.page 和hibernate 论坛：https : //forum.hibernate.org/viewtopic.php ?f =1&t=1029899
此外，我的同事在 GitHub 上创建了一个类似于我们的项目设置和问题的示例项目：https ://github.com/basvanstratum/cacheimpl