我无法正确获取此持久性文件...我在用作指南的书中找不到更多信息。我正在使用 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：DPL8015：存档 [EJBModule_jar] 中部署描述符文件 META-INF/persistence.xml 中的部署描述符无效。第 6 行第 15 列 -- cvc-complex-type.2.4.a：发现以元素“提供者”开头的无效内容。'{"http://java.sun.com/xml/ns/persistence":shared-cache-mode, "http://java.sun.com/xml/ns/persistence":validation-mode 之一， “http://java.sun.com/xml/ns/persistence”:properties}' 是预期的。
严重：DPL8005：部署描述符解析失败：cvc-complex-type.2.4.a：发现以元素“提供者”开头的无效内容。'{"http://java.sun.com/xml/ns/persistence":shared-cache-mode, "http://java.sun.com/xml/ns/persistence":validation-mode 之一， “http://java.sun.com/xml/ns/persistence”:properties}' 是预期的。
严重：部署应用程序时出现异常 [VaadinTestApp]
严重：org.xml.sax.SAXParseException：cvc-complex-type.2.4.a：发现以元素“提供者”开头的无效内容。'{"http://java.sun.com/xml/ns/persistence":shared-cache-mode, "http://java.sun.com/xml/ns/persistence":validation-mode 之一， “http://java.sun.com/xml/ns/persistence”:properties}' 是预期的。java.io.IOException：org.xml.sax.SAXParseException：cvc-complex-type.2.4.a：发现以元素“提供者”开头的无效内容。'{"http://java.sun.com/xml/ns/persistence":shared-cache-mode, "http://java.sun.com/xml/ns/persistence":validation-mode 之一， “http://java.sun.com/xml/ns/persistence”:properties}' 是预期的。