JPA - 未知的实体bean类 [英] JPA - Unknown entity bean class

问题描述

希望我能正确解释这个问题。我有3个类处理我的实体。

  @MappedSuperclass 
公共抽象类Swab实现ISwab {
 ... 
私人收藏< SwabAccounts>账户; 
 ... 
} 
 
 @Entity 
 @Table（name =switches）
 @DiscriminatorColumn（name =type）
 @DiscriminatorValue（value =DMS500）
 public class DmsSwab extends Swab实现ISwab，Serializable {
 ... 
私有ObjectPool池; 
 ... 
 @Transient 
 public ObjectPool getPool（）{
 return pool; 
} 
 ... 
} 
 
 @Entity（name =swab_accounts）
 public class SwabAccounts implements Serializable {
 private static最终的长串serialVersionUID = 1L; 
 
 @Id 
 @GeneratedValue（strategy = GenerationType.AUTO）
 private int swab_account_id; 
 private int swab_id; 
 ... 
} 
  

在EJB中，一个查询正在执行这样

  DmsSwab dms = em.find（DmsSwab.class，2）; 
清单<拭子> s = new ArrayList< Swab>（1）; 
 s.add（dms）; 
  

我的persistence.xml如下所示：

 <？xml version =1.0encoding =UTF-8？> 
< persistence version =1.0xmlns =http://java.sun.com/xml/ns/persistencexmlns：xsi =http://www.w3.org/2001/XMLSchema-实例xsi：schemaLocation =http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd\"> 
< persistence-unit name =dflow-putransaction-type =RESOURCE_LOCAL> 
< provider> oracle.toplink.essentials.PersistenceProvider< / provider> 
< class> com.dcom.sap.dms.DmsSwab< / class> 
< class> com.dcom.sap.jpa.SwabAccounts< / class> 
<属性> 
< property name =toplink.jdbc.uservalue =dflow/> 
< property name =toplink.jdbc.passwordvalue =dflow/> 
< property name =toplink.jdbc.urlvalue =jdbc：mysql：// itcd-400447：3306 / dflow/> 
< property name =toplink.jdbc.drivervalue =com.mysql.jdbc.Driver/> 
< / properties> 
< / persistence-unit> 
< /余辉> 
  

我得到这个错误：

  java.lang.IllegalArgumentException：未知实体bean类：class com.dcom.sap.dms.DmsSwab，请验证此类是否已用@Entity注释标记。 
 com.dcom.sap.SwabException：java.lang.IllegalArgumentException：未知实体bean类：class com.dcom.sap.dms.DmsSwab，请验证此类是否已用@Entity注释标记。 
导致：java.lang.IllegalArgumentException：未知实体bean类：class com.dcom.sap.dms.DmsSwab，请验证此类是否已使用@Entity注释标记。 
 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，它附带了glassfish的版本。 MySql 5.0。

解决方案

在persistence.xml中的类标记中定义此实体

Hopefully, I can explain this issue properly. I have 3 classes that deals with my entities.

@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;
...
}

And in a EJB a query is being doing this way

    DmsSwab dms = em.find(DmsSwab.class, 2);
    List<Swab> s = new ArrayList<Swab>(1);
    s.add(dms);

My persistence.xml looks like this:

<?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>

I get this error:

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)

I am running netbeans 6.1 with the version of glassfish that comes with it. MySql 5.0.

解决方案

define this entity in class tag inside the persistence.xml

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