JPA - 未知的实体bean类
希望我能正确解释这个问题。我有3个类来处理我的实体。JPA - 未知的实体bean类
@MappedSuperclass
public abstract class Swab implements ISwab {
...
private Collection<SwabAccounts> accounts;
...
}
@Entity
@Table(name="switches")
@DiscriminatorColumn(name="type")
@DiscriminatorValue(value="DMS500")
public class DmsSwab extends Swab implements ISwab, Serializable {
...
private ObjectPool pool;
...
@Transient
public ObjectPool getPool(){
return pool;
}
...
}
@Entity(name="swab_accounts")
public class SwabAccounts implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int swab_account_id;
private int swab_id;
...
}
而且在EJB查询正在做这样
DmsSwab dms = em.find(DmsSwab.class, 2);
List<Swab> s = new ArrayList<Swab>(1);
s.add(dms);
我的persistence.xml看起来是这样的:
<?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="dflow-pu" transaction-type="RESOURCE_LOCAL">
<provider>oracle.toplink.essentials.PersistenceProvider</provider>
<class>com.dcom.sap.dms.DmsSwab</class>
<class>com.dcom.sap.jpa.SwabAccounts</class>
<properties>
<property name="toplink.jdbc.user" value="dflow"/>
<property name="toplink.jdbc.password" value="dflow"/>
<property name="toplink.jdbc.url" value="jdbc:mysql://itcd-400447:3306/dflow"/>
<property name="toplink.jdbc.driver" value="com.mysql.jdbc.Driver"/>
</properties>
</persistence-unit>
</persistence>
我得到这个错误:
java.lang.IllegalArgumentException: Unknown entity bean class: class com.dcom.sap.dms.DmsSwab, please verify that this class has been marked with the @Entity annotation.
com.dcom.sap.SwabException: java.lang.IllegalArgumentException: Unknown entity bean class: class com.dcom.sap.dms.DmsSwab, please verify that this class has been marked with the @Entity annotation.
Caused by: java.lang.IllegalArgumentException: Unknown entity bean class: class com.dcom.sap.dms.DmsSwab, please verify that this class has been marked with the @Entity annotation.
at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerImpl.findInternal(EntityManagerImpl.java:306)
at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerImpl.find(EntityManagerImpl.java:148)
我正在运行netbeans 6.1版本的gla与它一起的ssfish。 MySql 5.0。
根据错误信息和我从你的代码中得出的结果,这个错误似乎在persistence.xml文件中,你能稍微详细一点吗?
定义在类标签这个实体的persistence.xml
里面我有同样的错误,并补充上述信息,我的情况是一个ClassLoader的问题。我的应用程序有三个文件。一个依赖于app-lib.jar(包含pojo和数据库实体的库)和依赖于app-lib.jar的web-module.war的ejb-module.jar。
在部署中,app-lib.jar由glassfish加载两次。谷歌搜索,我发现我应该将app-lib.jar复制到glassfish域中的“共享”库。我已将postgresql.jar复制到“domain-dir/lib”,将我的app-lib.jar复制到“domain-dir/lib/applibs”。完成后,应用程序就像一个魅力。
的使用说明可以在这里找到:http://docs.oracle.com/cd/E19798-01/821-1752/beade/index.html
我解决这个问题创造一个ContextListener在我的Web应用程序,调用实体管理器工厂在破坏环境的密切,:
public void contextDestroyed(ServletContextEvent servletContextEvent) {
try {
logger.info("contextDestroyed...");
LifeCycleManager lifeCycleManager = ServiceLocator.getLifeCycleManager();
lifeCycleManager.closeEntityManagerFactory();
} catch (Exception e) {
logger.error(e.getMessage(), e);
}
}
我也有名字LifeCycleManager创建一个bean和它们内部调用DAO方法关闭实体管理器工厂:
public void closeEntityManagerFactory() throws BusinessException {
logger.info("closeEntityManager");
try {
logger.info("closing entity manager factory...");
genericDAO.closeEntityManagerFactory();
logger.info("Entity manager factiry closed");
} catch (Exception e) {
throw new BusinessException(BusinessErrorCode.CODIGO_EJEMPLO_01, Severity.ERROR);
}
}
Insid E中的DAO:
...
@Autowired
private EntityManagerFactory entityManagerFactory;
...
public void closeEntityManagerFactory() {
logger.info("closing entity manager factory");
getEntityManagerFactory().close();
logger.info("entity manager factory closed");
}
使用这个我部署从我的Eclipse环境的破坏上下文中调用了一个变化,每次。 我希望可以帮助你们,我的环境是WebLogic Server 11gR1和JPA 1.0。
我找到了答案。 Netbeans /玻璃鱼似乎需要一些工作。我不得不取消部署,停止服务器,然后重新启动,然后工作正常。 – arinte 2008-10-03 14:31:44