EclipseLink-非实体作为关系属性中的目标实体

Question

我使用的是Netbeans IDE 8.0.2和eclipselink 2.5.2。下面是打开连接时出现的异常，问题是这种情况并不是每次都发生。异常“Departmento”中描述的实体完全遵循其他类的模式，即我们的系统已经包含大约500个实体类，只有在新的类中才发生此异常。这个实体是由Netbeans的“实体类从数据库”选项生成的，并添加到持久化XML...

由:javax.Persistence.persistenceException:Exception[EclipseLink-28018](Eclipse Persistence.Exceptions.EntityManagerSetupException异常描述：PersistenceUnit[totemPU]预部署失败。内部异常：异常[EclipseLink-7250]（Eclipse Persistence Services-2.5.2.v20140319-9AD6ABD):org.Eclipse.Persistence.exceptions.validationException异常描述:[class entidade.item]在关系属性[field departamento]中使用非实体[class entidade.departamento]作为目标实体。

实体部门

@Entity
@Table(name = "departamento")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Departamento.findAll", query = "SELECT d FROM Departamento d"),
@NamedQuery(name = "Departamento.findById", query = "SELECT d FROM Departamento d WHERE   d.departamentoPK.id = :id"),
@NamedQuery(name = "Departamento.findByIdEmpresa", query = "SELECT d FROM Departamento d WHERE d.departamentoPK.idEmpresa = :idEmpresa"),
@NamedQuery(name = "Departamento.findByDescricao", query = "SELECT d FROM Departamento d WHERE d.descricao = :descricao"),
@NamedQuery(name = "Departamento.findByLixo", query = "SELECT d FROM Departamento d WHERE d.lixo = :lixo"),
@NamedQuery(name = "Departamento.findByIp", query = "SELECT d FROM Departamento d WHERE d.ip = :ip")})
public class Departamento implements Serializable {

private static final long serialVersionUID = 1L;
@EmbeddedId
protected DepartamentoPK departamentoPK;
@Basic(optional = false)
@Column(name = "descricao")
private String descricao;
...
Getters() and Setters()

实体项目

@Entity
@Table(name = "item")
public class Item implements Serializable {

@EmbeddedId
protected ItemPK itemPK;
@JoinColumns({
    @JoinColumn(name = "departamento_id", referencedColumnName = "id"),
    @JoinColumn(name = "departamento_id_empresa", referencedColumnName = "id_empresa")})
@ManyToOne(optional = true)
private Departamento departamento;
...
Getters() and Setters()

persistence.xml

<persistence-unit name="totemPU" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>entidade.Departamento</class>
<class>entidade.item</class>
... More classes ...
<properties>
  <property name="javax.persistence.jdbc.url" value="jdbc:mysql://xxx"/>
  <property name="javax.persistence.jdbc.password" value="xxx"/>
  <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
  <property name="javax.persistence.jdbc.user" value="xxx"/>
  <property name="javax.persistence.jdbc.autoReconnect" value="true"/>
  <property name="eclipselink.logging.session" value="false"/>
  <property name="eclipselink.logging.level" value="OFF"/>
  <property name="eclipselink.weaving" value="static"/>
  <property name="eclipselink.query-results-cache" value="false"/>
</properties>

在同一个persistence.xml中有三个以上的持久化单元。

Answer 1

当我忘记在persistence.xml中添加另一个实体试图使用的类时，我通常会看到这个错误。确保为创建EntityManagerFactory而传入的持久化单元名称是所需的名称（totemPU）。它似乎使用了一个持久化单元，其中包括Entidade.Item，但不包括Entidade.DepartaMento。