javax.persistence.PersistenceException：没有名为 Eclipselink_JPA 的 EntityManager 的持久性提供程序

Question

我是 JPA 的新手，对此我很迷茫。

我在 netbeans 中创建了一个企业项目来做一些测试。使用向导创建了这个持久性单元。我给它添加了一个正常工作的 JNDI 连接，它已经过测试：

<?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="persistencia" transaction-type="JTA">
    <jta-data-source>jdbc/nuevaConexion</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="javax.persistence.schema-generation.database.action" value="create"/>
    </properties>
  </persistence-unit>
</persistence>

稍后，我创建了一个带有一些测试变量的示例实体以查看其工作原理：

@Entity
public class Entity1 implements Serializable {

    private static long serialVersionUID = 1L;

    private String nombre;
    private int numero;
    /**
     * @return the serialVersionUID
     */
    public static long getSerialVersionUID() {
        return serialVersionUID;
    }

    /**
     * @param aSerialVersionUID the serialVersionUID to set
     */
    public static void setSerialVersionUID(long aSerialVersionUID) {
        serialVersionUID = aSerialVersionUID;
    }
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;

   // setters & getters

然后，尝试使服务 CreateEntity1 试一试，并尝试通过调用它在 DB 上创建一个新元素：

public class CreateEntity1 {

   public static void main( String[ ] args ) {

      EntityManagerFactory emfactory = Persistence.createEntityManagerFactory( "Eclipselink_JPA" );      
      EntityManager entitymanager = emfactory.createEntityManager( );
      entitymanager.getTransaction( ).begin( );

      Entity1 ent = new Entity1( ); 
      ent.setId(1);
      ent.setNombre("Mi entidad");
      ent.setNumero(123);

      entitymanager.persist( ent );
      entitymanager.getTransaction( ).commit( );
      entitymanager.close( );
      emfactory.close( );
   }
}

...但它不起作用。我收到以下错误：

Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named Eclipselink_JPA at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:85) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54) at service.CreateEntity1.main(CreateEntity1.java:22) C:\Users\hp\AppData\Local\NetBeans\Cache.1\executor-snippets\run.xml:53: Java returned: 1 BUILD FAILED (total time: 0 seconds)

我做错了什么？

编辑：我将持久性提供程序的名称更改为好的名称，但现在我遇到了一堆严重的错误。

编辑 2：将所有内容更改为休眠类型。仍然出现巨大错误：

Exception in thread "main" Local Exception Stack: Exception [EclipseLink-30009] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException Exception Description: An exception was thrown while trying to load persistence unit at url: file:/C:/Users/hp/Documents/NetBeansProjects/PruebasJ2EE/PruebasJ2EE-ejb/build/classes/ Internal Exception: Exception [EclipseLink-30004] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException Exception Description: An exception was thrown while processing persistence.xml from URL: file:/C:/Users/hp/Documents/NetBeansProjects/PruebasJ2EE/PruebasJ2EE-ejb/build/classes/ Internal Exception: (1. El destino de la instrucción de procesamiento que coincide con "[xX][mM][lL]" no está permitido.) at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionLoadingFromUrl(PersistenceUnitLoadingException.java:100) at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processPersistenceArchive(PersistenceUnitProcessor.java:616) at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.getPersistenceUnits(PersistenceUnitProcessor.java:500) at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.findPersistenceUnitInfoInArchive(JPAInitializer.java:178) at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.findPersistenceUnitInfoInArchives(JPAInitializer.java:160) at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.findPersistenceUnitInfo(JPAInitializer.java:141) at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:188) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54) at service.CreateEntity1.main(CreateEntity1.java:22) Caused by: Exception [EclipseLink-30004] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException Exception Description: An exception was thrown while processing persistence.xml from URL: file:/C:/Users/hp/Documents/NetBeansProjects/PruebasJ2EE/PruebasJ2EE-ejb/build/classes/ Internal Exception: (1. El destino de la instrucción de procesamiento que coincide con "[xX][mM][lL]" no está permitido.) at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionProcessingPersistenceXML(PersistenceUnitLoadingException.java:118) at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processPersistenceXML(PersistenceUnitProcessor.java:665) at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processPersistenceArchive(PersistenceUnitProcessor.java:614) ... 8 more Caused by: (1. El destino de la instrucción de procesamiento que coincide con "[xX][mM][lL]" no está permitido.) at org.eclipse.persistence.internal.jpa.deployment.xml.parser.XMLExceptionHandler.error(XMLExceptionHandler.java:28) at org.eclipse.persistence.internal.jpa.deployment.xml.parser.XMLExceptionHandler.fatalError(XMLExceptionHandler.java:34) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:180) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:441) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:368) at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1436) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPIData(XMLScanner.java:723) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanPIData(XMLDocumentFragmentScannerImpl.java:1018) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPI(XMLScanner.java:691) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:912) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:117) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:649) at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processPersistenceXML(PersistenceUnitProcessor.java:655) ... 9 more C:\Users\hp\AppData\Local\NetBeans\Cache.1\executor-snippets\run.xml:53: Java returned: 1 BUILD FAILED (total time: 0 seconds)

Answer 1

看看我在 Simplest working example of Spring Data JPA 的答案。对我来说这很简单。希望对您来说也一样简单。

Answer 2

你错过了<provider>...试试这样添加：

  <?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="persistencia" transaction-type="JTA">
   <provider>org.hibernate.ejb.HibernatePersistence</provider>
   ...

javax.persistence.PersistenceException：没有名为 Eclipselink_JPA 的 EntityManager 的持久性提供程序

javax.persistence.PersistenceException: No Persistence provider for EntityManager named Eclipselink_JPA

jpa

eclipselink