我有一个最小的网络应用程序,你可以在这里下载(6Kb): http ://www.mediafire.com/?6vo1tc141t65r1g
相关配置是:
-eclipselink 2.3.2
-server 是 tomee 1.0(但 glassfish 3.1 是一样的)
当我点击页面并按 F5 重复刷新时:
http://localhost:8080/testCache/jsf/test.xhtml
我在控制台中看到几行这样的行
[EL Fine]: 2012-08-29 19:01:30.821--ServerSession(32981564)--Connection(27242067)--Thread(Thread[http-bio-8080-exec-12,5,main])--从任务类型中选择 ID、任务类型
通过运行嗅探器,我看到 SQL 请求总是发送到服务器。我虽然 Eclipselink 的 2 级缓存会返回结果(表中的 5 行)而不查询数据库。那么怎么了,我该如何激活缓存?
文件中的一些摘录
持久性.xml:
<?xml version="1.0" encoding="UTF-8"?>
<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="xxxPU" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>microsoft</jta-data-source>
<properties>
<property name="eclipselink.logging.level" value="FINE"/>
<property name="eclipselink.logging.parameters" value="true"/>
</properties>
</persistence-unit>
</persistence>
执行查询的 EJB
/**
* Some useless class required to use JTA transactions
*
* @author Administrator
*
*/
@Stateless
public class Facade {
@PersistenceContext(unitName = "xxxPU")
private EntityManager em;
public List findAll(Class entityClass) {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
cq.select(cq.from(entityClass));
return em.createQuery(cq).getResultList();
}
public EntityManager getEntityManager() {
return em;
}
}
实体bean:
@Entity
@Table(name = "tasktype")
public class TaskType {
@Id
@Column(name = "id")
private Integer id;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 10)
@Column(name = "tasktype")
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}