java - EclipseLinke :No resource files named META-INF/services/javax. persistence.spi:未找到 PersistenceProvider

Question

我正在使用 EclipseLink，甚至我已经用 maven 导入了所有必要的 jar 文件，我仍然得到异常:

Exception in thread "main" javax.persistence.PersistenceException: No resource files named META-INF/services/javax.persistence.spi.PersistenceProvider were found. Please make sure that the persistence provider jar file is in your classpath.

在 Maven pom 中我有依赖:

<dependency>
      <groupId>javax.persistence</groupId>
      <artifactId>persistence-api</artifactId>
      <version>1.0.2</version>
      <scope>provided</scope>
</dependency>

这是我的 persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
    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_2_0.xsd">
    <persistence-unit name="PersistenzJPAProjekt">
     <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <class>com.testJPABasis.Person</class>

    </persistence-unit>
</persistence>

这里是 eclipse 中的 clathpath:

实际产生异常的类:

public class TestJPA
{
    public static void main(String[] args)
    {
        Person person = new Person();
        person.setPersonID(1);

        EntityManagerFactory emf = Persistence.createEntityManagerFactory("PersistenzJPAProjekt");
        EntityManager em = emf.createEntityManager();

    }
}

persistence.xml 直接在 META-INF 下。据我所知，我不需要 Glassfish 或 Tomcat，因为 EclipseLink 是为独立应用程序制作的。如果我错了，也许这就是原因。 Meta-Inf 放置在:

Answer 1

persistence-api 就是:API(主要是接口(interface))。您仍然需要包括实际的持久性提供者；看起来您需要 EclipseLink。