Question

我有一个运行在tomcat上的Java EE应用程序，它有几个实体类，并使用eclipselink 2.1和jpa 2.0。实体是EmailNotification和EmailNotificationQueueRow。

@Entity
public class EmailNotification implements Serializable, IEntity<Integer> {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO, generator = "emailGen")
@SequenceGenerator(name = "emailGen", sequenceName = "SQ_EMAIL_NOTIFICATIONS", allocationSize=1)
@Basic(optional = false)
@Column(name = "EMAIL_ID")
private Integer emailId;
@Basic(optional = false)
@Column(name = "EMAIL_SUBJECT")
private String emailSubject;
@Basic(optional = false)
@Column(name = "EMAIL_BODY")
private String emailBody;
@Basic(optional = false)
@Column(name = "SENT_FROM_EMAIL_ADDRESS")
private String sentFromEmailAddress;
@Column(name = "SEND_TO_ORG_ID")
private Integer sendToOrgId;
@Column(name = "SEND_TO_EMAIL_ADDRESS")
private String sendToEmailAddress;
@Column(name = "CARBON_COPY_ORG_ID")
private Integer carbonCopyOrgId;
@Column(name = "CARBON_COPY_EMAIL_ADDRESS")
private String carbonCopyEmailAddress;
@Column(name = "BCC_ORG_ID")
private Integer bccOrgId;
@Column(name = "BCC_EMAIL_ADDRESS")
private String bccEmailAddress;
@Column(name = "PROJECT_ID")
private Integer projectId;

//getters and setters
}

@Entity
public class EmailNotificationQueueRow implements Serializable, IEntity<Integer> {

private static final long serialVersionUID = 1L;
@Id
@Basic(optional = false)
@Column(name = "EMAIL_QUEUE_ID")
private Integer emailQueueId;
@Basic(optional = false)
@Column(name = "EMAIL_ID")
private int emailId;
@Basic(optional = false)
@Column(name = "REQUEST_DATE")
@Temporal(TemporalType.TIMESTAMP)
private Date requestDate;
@Basic(optional = false)
@Column(name = "MESSAGE_SENT_FLAG")
private String messageSentFlag;
@Column(name = "MESSAGE_SENT_DATE")
@Temporal(TemporalType.TIMESTAMP)
private Date messageSentDate;
@JoinColumn(name = "EMAIL_ID", referencedColumnName = "EMAIL_ID", updatable = false, insertable = false)
@OneToOne(fetch = FetchType.LAZY)
private EmailNotification emailNotification;

//getters and setters
}

每当我将emailNotification变量的关系设置为FetchType.LAZY（如上所述）时，都不会编织该类。它是编织注册但从来没有。

日志如下。 EmailNotification实体是编织的，但不是EmailNotificationQueueRow实体。有什么想法吗？

[EL Config]: 2011-02-15 14:21:13.642--ServerSession(1191324)--Thread(Thread[main,5,main])
--The access type for the persistent class [class persistence.model.EmailNotification] is set to [FIELD].
[EL Config]: 2011-02-15 14:21:13.674--ServerSession(1191324)--Thread(Thread[main,5,main])
--The access type for the persistent class [class persistence.model.EmailNotificationQueueRow] is set to [FIELD].
[EL Config]: 2011-02-15 14:21:13.674--ServerSession(1191324)--Thread(Thread[main,5,main])
--The target entity (reference) class for the one to one mapping element [field emailNotification] is being defaulted to: class persistence.model.EmailNotification.
[EL Config]: 2011-02-15 14:21:13.689--ServerSession(1191324)--Thread(Thread[main,5,main])
--The alias name for the entity class [class persistence.model.EmailNotification] is being defaulted to: EmailNotification.
[EL Config]: 2011-02-15 14:21:13.72--ServerSession(1191324)--Thread(Thread[main,5,main])
--The alias name for the entity class [class persistence.model.EmailNotificationQueueRow] is being defaulted to: EmailNotificationQueueRow.
[EL Finer]: 2011-02-15 14:21:13.736--ServerSession(1191324)--Thread(Thread[main,5,main])
--Class [persistence.model.EmailNotification] registered to be processed by weaver.
[EL Finer]: 2011-02-15 14:21:13.799--ServerSession(1191324)--Thread(Thread[main,5,main])
--Class [persistence.model.EmailNotificationQueueRow] registered to be processed by weaver.
[EL Finest]: 2011-02-15 14:21:13.799--ServerSession(1191324)--Thread(Thread[main,5,main])
--End predeploying Persistence Unit iDMS_Persistence_Unit; session file:/C:/idms/build/web/WEB-INF/classes/_iDMS_Persistence_Unit; state Predeployed; factoryCount 1
[EL Finest]: 2011-02-15 14:21:13.908--ServerSession(1191324)--Thread(Thread[main,5,main])
--Begin weaver class transformer processing class [persistence/model/EmailNotification].
[EL Finest]: 2011-02-15 14:21:13.924--ServerSession(1191324)--Thread(Thread[main,5,main])
--Weaved persistence (PersistenceEntity) [persistence/model/EmailNotification].
[EL Finest]: 2011-02-15 14:21:13.924--ServerSession(1191324)--Thread(Thread[main,5,main])
--Weaved change tracking (ChangeTracker) [persistence/model/EmailNotification].
[EL Finest]: 2011-02-15 14:21:13.986--ServerSession(1191324)--Thread(Thread[main,5,main])
--Weaved fetch groups (FetchGroupTracker) [persistence/model/EmailNotification].
[EL Finest]: 2011-02-15 14:21:13.986--ServerSession(1191324)--Thread(Thread[main,5,main])
--End weaver class transformer processing class [persistence/model/EmailNotification].

的persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" 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_1_0.xsd">
  <persistence-unit name="iDMS_Persistence_Unit" transaction-type="JTA">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <jta-data-source>jdbc/dms</jta-data-source>
    <class>persistence.model.EmailNotification</class>
    <class>persistence.model.EmailNotificationQueueRow</class>
    <exclude-unlisted-classes>true</exclude-unlisted-classes>
  <properties>
    <property name="eclipselink.weaving" value="true"/>
    <property name="eclipselink.cache.shared.default" value="false"/>
    <property name="eclipselink.logging.level" value="FINEST"/>
  </properties>
</persistence-unit>
</persistence>

更新

我正在使用eclipselink javaagent字符串来启动tomcat。还有其他的OneToOne映射在我的项目中被延迟加载并被编织。它只有这一类（EmailNotificationQueueRow）没有被编织。

Answer 1

我有点困惑。您说您在Tomcat中使用Java EE应用程序？我不明白，Tomcat只是一个Web容器，而不是Java EE服务器？

兼容的Java EE服务器允许在部署期间编织托管JPA实体，但Tomcat不是Java EE服务器。

我不确定使用-javaagent启动Tomcat是否可以使用Tomcat加载类的方式。我认为你必须使用Tomcat静态编织，或者使用Spring。不确定你是如何工作的？你确定它们是动态编织的吗？可能与Tomcat如何加载类有关，它们是否以相同的方式部署？

Answer 2

请确保使用jvm参数

将 EclipseLink代理添加到jvm

-javaagent:eclipselink.jar

有关详细信息，请查看EclipseLink documentation

Answer 3

Tomcat加载时编织怎么样？我认为这是最好的方式。我成功地将它与Tomcat 6/7一起使用 http://static.springsource.org/spring/docs/2.0.x/reference/orm.html#orm-jpa
章
“12.6.1.3.1.Tomcat加载时编织设置（5.0 +）”

Answer 4

这是一个在项目中启用dynamic weaving的完整解决方案，它还展示了如何启用静态编织。

实体没有编织。 Eclipselink 2.1 +动态编织

4 个答案: