Persistence.xml

Question

当我遵循restful project in netbeans的时候，我得到了这个错误。

SEVERE: Exception while invoking class org.glassfish.persistence.jpa.JPADeployer prepare method
java.lang.RuntimeException: java.lang.ClassNotFoundException: oracle.toplink.essentials.PersistenceProvider
Caused by: java.lang.ClassNotFoundException: oracle.toplink.essentials.PersistenceProvider

SEVERE: Exception while deploying the app
java.lang.RuntimeException: java.lang.ClassNotFoundException: oracle.toplink.essentials.PersistenceProvider
Caused by: java.lang.ClassNotFoundException: oracle.toplink.essentials.PersistenceProvider

我确信问题出在persistence.xml上。这是我的persistence.xml：)

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.0" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
  <persistence-unit name="ayniPU" transaction-type="JTA">
    <provider>oracle.toplink.essentials.PersistenceProvider</provider>
    <jta-data-source>jndi/ayni</jta-data-source>
    <properties>
      <property name="toplink.ddl-generation" value="drop-and-create-tables"/>
       <property name="toplink.jdbc.user" value="root"/>
    <property name="toplink.jdbc.password" value="3774634"/>
    </properties>
  </persistence-unit>
</persistence>

我使用toplink连接mysql数据库。我有glassfishv3和Netbeans6.7 6.7。我想不出这个问题。问题出在哪里？我该如何解决这个问题呢？

Answer 1

这只是一个简单的CLASSPATH问题。您的CLASSPATH中没有TopLink JAR。NetBeans假设TopLink是您的JPA实现。

找到JAR并将它们提供给NetBeans，或者切换到Hibernate作为您的JPA实现。