小编DRC*_*RCB的帖子

我是JPA和Hibernate的新手.在阅读了一些在线资料后,我现在了解了Hibernate是什么以及它如何与JPA一起使用.

现在,我正在尝试运行这个JPA和Hibernate教程.我已经完成了他们在本教程中提到的所有内容.

我没有Oracle DB,只有MySQL.所以我对persistence.xml使用我对JPA和Hibernate的理解做了一些修改(我不知道它是否正确......对我而言似乎是.)

这是我的 persistence.xml

<persistence 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_1_0.xsd" version="1.0">
  <persistence-unit name="customerManager" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <class>Customer</class>
    <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLInnoDBDialect"/>
      <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
      <property name="hibernate.show_sql" value="true"/>
      <property name="hibernate.connection.username" value="root"/>
      <property name="hibernate.connection.password" value="1234"/>
      <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/general"/>
      <property name="hibernate.max_fetch_depth" value="3"/>
    </properties>
  </persistence-unit>
</persistence>

但我似乎没有得到他们描述的输出.它给了我:

Customer id before creation:null
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.annotations.Version).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" javax.persistence.PersistenceException: No Persistence     provider for EntityManager named customerManager
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