persistence.xml配置不正确

Question

我无法正确获取此持久性文件...我在书中找不到任何更多的资料可供我参考。我用的是MySQL数据库。

<?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="a11_DA_g5_PU" transaction-type="JTA">
        <jta-data-source>a11_DA_g5</jta-data-source>
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <class>entities.Book</class>
        <class>entities.Author</class>
        <class>entities.Customer</class>
        <class>entities.Membership</class>
        <properties>
          <property name="eclipselink.target-database" value="DERBY"/>
          <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/>
          <property name="javax.persistence.jdbc.url" value="jdbc:mysql://studev.groept.be:3306/a11_DA_g5"/>
          <property name="javax.persistence.jdbc.user" value="a11_DA_g5"/>
          <property name="javax.persistence.jdbc.password" value="passwordhere"/>
          <property name="eclipselink.ddl-generation" value="create-tables"/>
        </properties>
      </persistence-unit>
    </persistence>

编辑

严重：部署应用程序[VaadEntertainapp]时出现异常

Severe：org.xml.sax.SAXParseException：cvc-complex-type.2.4.a:发现以元素“provider”开头的内容无效。应为“{”http://java.sun.com/xml/ns/persistence“：shared-cache-mode,”http://java.sun.com/xml/ns/persistence“：validation-mode,”http://java.sun.com/xml/ns/persistence“：properties}”之一。java.io.ioException：org.xml.sax.saxParseException：cvc-complex-type.2.4.a:发现以元素“provider”开头的内容无效。应为“{”http://java.sun.com/xml/ns/persistence“：shared-cache-mode,”http://java.sun.com/xml/ns/persistence“：validation-mode,”http://java.sun.com/xml/ns/persistence“：properties}”之一。

Answer 1

中元素的顺序很重要， 应该放在 :

<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider> 
<jta-data-source>a11_DA_g5</jta-data-source>