EclipseLinke:没有名为META-INF / services / javax.persistence.spi的资源文件:找不到PersistenceProvider [英] EclipseLinke:No resource files named META-INF/services/javax.persistence.spi:No PersistenceProvider were found
问题描述
我正在使用EclipseLink,甚至我已经使用maven导入了所有必需的jar文件,我仍然得到例外:
I am using EclipseLink and even I have all necessary jar files imported with maven, I get still the Exception:
线程中的异常mainjavax.persistence.PersistenceException:没有名为
的
资源文件META-INF / services / javax.persistence.spi.PersistenceProvider找到
。请确保持久性提供程序jar文件在
类路径中。
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中我有依赖关系:
In Maven pom I have the dependency:
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0.2</version>
<scope>provided</scope>
</dependency>
这是我的persistence.xml:
Here is my 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:
Here the clathpath in eclipse:
实际生成异常的类:
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直接位于META-INF。据我所知,我不需要Glassfish或Tomcat,因为EclipseLink是为独立应用程序而制作的。如果我错了,也许这就是原因。 Meta-Inf位于:
The persistence.xml is directly under META-INF. As far as I know I don't need to have Glassfish or Tomcat as EclipseLink is made for standalone applications. If I am wrong maybe this is then the cause. The Meta-Inf is placed in:
推荐答案
persistence-api
就是这样的:API (主要是接口)。您仍然需要包含实际的持久性提供程序;看起来你想要EclipseLink。
persistence-api
is just that: the API (mostly interfaces). You still need to include the actual persistence provider; it looks like you're wanting EclipseLink.
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