EclipseLink JPA在关系属性中使用非实体作为目标实体

Question

我在JUnit（版本4.12）中运行测试以下订单时遇到以下错误：

Local Exception Stack: 
Exception [EclipseLink-30005] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: sun.misc.Launcher$AppClassLoader@2c7b84de
Internal Exception: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [snel-transport-test] failed.
Internal Exception: Exception [EclipseLink-7250] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.ValidationException
Exception Description: [class nl.cimsolutions.snel_transport.models.OrderLine] uses a non-entity [class nl.cimsolutions.snel_transport.models.Product] as target entity in the relationship attribute [field product].
    at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:127)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactoryImpl(PersistenceProvider.java:107)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:177)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
    at nl.cimsolutions.snel_transport.services.AbstractFacade.getEntityManagerFactory(AbstractFacade.java:31)
    at nl.cimsolutions.snel_transport.services.AbstractFacade.find(AbstractFacade.java:77)
    at controller.OrdersControllerTest.testAddOrder(OrdersControllerTest.java:345)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [snel-transport-test] failed.

但是，当我运行webapp时，在下订单时它确实可以工作。

在下面您可以看到代码：

OrderLine.java：

@Entity 
public class OrderLine implements Serializable {

    private static final long serialVersionUID = 1L;
    @TableGenerator(
            name = "OrderLineGenerator",
            allocationSize = 1,
            initialValue = 1)
    @Id
    @GeneratedValue(strategy = GenerationType.TABLE,
        generator="OrderLineGenerator")
    private Long id;
    @Column(name = "orderId")
    private Long orderId;
    @ManyToOne(targetEntity = nl.cimsolutions.snel_transport.models.Product.class)
    @JoinColumn(name="productId")
    private Product product;
    private int amount;

    //More code..
}

Product.java：

@Entity
public class Product {

    @TableGenerator(
            name = "ProductGenerator",
            allocationSize = 1,
            initialValue = 1)
    @Id
    @GeneratedValue(strategy = GenerationType.TABLE,
            generator="ProductGenerator")
    private Long id;
    @Column(name="Name")
    private String Name;
    @Column(name="Price")
    private Double Price;
    @Column(name="code")
    private String Code;
    @OneToOne
    @JoinColumn(name="categoryId")
    private Category Categories;

    @OneToMany(mappedBy = "product", targetEntity = nl.cimsolutions.snel_transport.models.OrderLine.class)
    private List<OrderLine> orderLines;

    public Product(){

    }

    public Product(Long Id, String name,String code, Double price, Category categories) {
        super();
        id = Id;
        Name = name;
        Price = price;
        Code = code;
        Categories = categories;
    }

    //More code..
}

persistence.xml：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1"
    xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
    <persistence-unit name="snel-transport" transaction-type="RESOURCE_LOCAL">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <class>nl.cimsolutions.snel_transport.models.Orders</class>
        <class>nl.cimsolutions.snel_transport.models.OrderLine</class>
        <class>nl.cimsolutions.snel_transport.models.OrderList</class>
        <class>nl.cimsolutions.snel_transport.models.Customer</class>
        <class>nl.cimsolutions.snel_transport.models.Product</class>
        <class>nl.cimsolutions.snel_transport.models.Category</class>
        <class>nl.cimsolutions.snel_transport.models.Status</class>
        <class>nl.cimsolutions.snel_transport.models.Truck</class>
        <class>nl.cimsolutions.snel_transport.models.Route</class>
        <!-- <jta-data-source>java:app/snel-transport</jta-data-source> -->
        <!-- <exclude-unlisted-classes>false</exclude-unlisted-classes> -->
        <properties>
            <property
                name="javax.persistence.schema-generation.database.action"
                value="create" />
            <property name="eclipselink.cache.shared.default" value="false"/>
            <property name="eclipselink.canonicalmodel.subpackage"
                value="dev" />
            <property name="javax.persistence.sql-load-script-source"
                value="META-INF/sql/insert.sql" />
            <property name="javax.persistence.schema-generation-target"
                value="database" />
            <property name="javax.persistence.jdbc.driver"
                value="org.postgresql.Driver" />
            <property name="javax.persistence.jdbc.url"
                value="jdbc:postgresql://localhost:5432/snel-transport" />
            <property name="javax.persistence.jdbc.user" value="transport_user" />
            <property name="javax.persistence.jdbc.password"
                value="admin" />

            <property name="javax.persistence.jdbc.show_sql" value="true" />
        </properties>
    </persistence-unit>
    <persistence-unit name="snel-transport-test" transaction-type="RESOURCE_LOCAL">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <class>nl.cimsolutions.snel_transport.models.Orders</class>
        <class>nl.cimsolutions.snel_transport.models.OrderLine</class>
        <class>nl.cimsolutions.snel_transport.models.OrderList</class>
        <class>nl.cimsolutions.snel_transport.models.Customer</class>
        <class>nl.cimsolutions.snel_transport.models.Product</class>
        <class>nl.cimsolutions.snel_transport.models.Category</class>
        <class>nl.cimsolutions.snel_transport.models.Status</class>
        <class>nl.cimsolutions.snel_transport.models.Truck</class>
        <class>nl.cimsolutions.snel_transport.models.Route</class>
        <properties>
            <property
                name="javax.persistence.schema-generation.database.action"
                value="drop-and-create" />
            <property name="eclipselink.canonicalmodel.subpackage"
                value="test" />

            <property name="javax.persistence.sql-load-script-source"
                value="META-INF/sql/insert.sql" />
            <property name="javax.persistence.schema-generation-target"
                value="database" />
            <property name="javax.persistence.jdbc.driver"
                value="org.postgresql.Driver" />
            <property name="javax.persistence.jdbc.url"
                value="jdbc:postgresql://localhost:5432/snel-transport-test" />
            <property name="javax.persistence.jdbc.user" value="transport_user" />
            <property name="javax.persistence.jdbc.password"
                value="admin" />
            <property name="driverClass" value="org.postgresql.Driver" />
        </properties>
    </persistence-unit>
</persistence>

如您所见，我已经通过使用Product.java和OrderLine.java的@Entity注释将Product和OrderLine清楚地标记为实体。 我还在persistence.xml文件中列出了这两个类。

我可以删除mappedBy在Product.java这解决了这个问题，但我不希望这样，因为我不希望创建一个额外的表。

我已经检查了以下解决方案：

jpa错误在关系属性中使用非实体[类ch.printsoft.mailhouse.usermgr.entity.Department]作为目标实体

JPA EclipseLink在关系属性中使用非实体作为目标实体

EclipseLink-非Entity作为关系属性中的目标实体

但是我找不到能解决我问题的东西。 任何知道如何解决此问题的人？

Answer 1

如果它在一个地方起作用，但在另一个地方不起作用，则可能是类路径问题。

在JUnit中运行时，请检查您的类路径是否没有其他非实体产品类文件被拾取，或者是否存在可能缺少产品的其他persistence.xml。 还要将EclipseLink日志记录设置为最好，因为它将在为持久性单元部署它时显示每个类

Answer 2

错误

[class nl.cimsolutions.snel_transport.models.OrderLine]在关系属性[field product]中使用非实体[class nl.cimsolutions.snel_transport.models.Product]作为目标实体。

表示OrderLine中的product字段引用的产品不属于persistenceContext。 通常发生这种情况是因为没有在Product上调用EntityManager.persist（），并且没有Cascade.Persist可以自动持久化它。

很难想象这可能是类路径问题，但是我看到了一些奇怪的事情。 我认为您应该首先检查与OrderLine.product中的产品商店相关的持久性逻辑。