Question

过去几天我一直在努力解决这个错误。请有人指出我出错的地方。

我正在尝试将JPA与eclipselink一起使用。它工作正常。为了检查JPA与hibernate作为持久性提供程序的行为，我更改了persitence.xml，并且我收到了臭名昭着的错误“没有持久性提供程序，因为EntityManager命名为usinghibernate”

我的persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" 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_1_0.xsd">
  <persistence-unit name="usinghibernate">
    <provider>org.hibernate.ejb.HibernatePeristence</provider>
    <class>arun.ucerelay.datastructures.XVMUpdateProfile</class>
    <class>arun.ucerelay.datastructures.XVMUpdateProfileItem</class>

    <!-- Scan for annotated classes and Hibernate mapping XML files -->
    <properties>
       <property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver"/>
       <property name="hibernate.connection.url" value="jdbc:oracle:thin:@localhost:1521:krsna"/>
       <property name="hibernate.connection.username" value="scott"/>
       <property name="hibernate.connection.password" value="tiger"/>
       <property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect"/>
       <property name="hibernate.show_sql" value="true"/>
    </properties>
  </persistence-unit>
</persistence>

Java程序：

   public static void main(String args[]) {
        try {
           EntityManagerFactory emf = Persistence.createEntityManagerFactory("usinghibernate");
            // First unit of work
            EntityManager em = emf.createEntityManager();
...
...

以下是我为获取hibernate jar所做的事情：我在maven pom.xml中包含了2个依赖项：

 ...
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-entitymanager</artifactId>
      <version>3.5.6-Final</version>
    </dependency>

    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.5.2</version>
    </dependency>
   ...

在日志中，很明显它能够找到META-INF / persistence.xml和持久性单元，并再次抱怨它找不到持久性单元。

TRACE 2011-02-26 00:50:31,765 [main](PersistenceXmlLoader.java:112) org.hibernate.ejb.packaging.PersistenceXmlLoader - Validate with persistence_2_0.xsd schema on file file:/C:/arun/eclipse/workspace/practicewitheclipselink/target/classes/META-INF/persistence.xml
TRACE 2011-02-26 00:50:31,781 [main](PersistenceXmlLoader.java:117) org.hibernate.ejb.packaging.PersistenceXmlLoader - Found error with persistence_2_0.xsd schema on file file:/C:/arun/eclipse/workspace/practicewitheclipselink/target/classes/META-INF/persistence.xml
TRACE 2011-02-26 00:50:31,781 [main](PersistenceXmlLoader.java:127) org.hibernate.ejb.packaging.PersistenceXmlLoader - Validate with persistence_1_0.xsd schema on file file:/C:/arun/eclipse/workspace/practicewitheclipselink/target/classes/META-INF/persistence.xml
TRACE 2011-02-26 00:50:31,781 [main](PersistenceXmlLoader.java:239) org.hibernate.ejb.packaging.PersistenceXmlLoader - Persistent Unit name from persistence.xml: usinghibernate
TRACE 2011-02-26 00:50:31,781 [main](Ejb3Configuration.java:321) org.hibernate.ejb.Ejb3Configuration - PersistenceMetadata(version=1.0) [
   name: usinghibernate
   jtaDataSource: null
   nonJtaDataSource: null
   transactionType: RESOURCE_LOCAL
   provider: org.hibernate.ejb.HibernatePeristence
   useQuotedIdentifiers: false
   classes[
      arun.ucerelay.datastructures.XVMUpdateProfile      arun.ucerelay.datastructures.XVMUpdateProfileItem   ]
   packages[
   ]
   mappingFiles[
   ]
   jarFiles[
   ]
   hbmfiles: 0
   properties[
      hibernate.connection.username: scott
      hibernate.connection.password: tiger
      hibernate.dialect: org.hibernate.dialect.OracleDialect
      hibernate.show_sql: true
      hibernate.connection.url: jdbc:oracle:thin:@localhost:1521:krsna
      hibernate.connection.driver_class: oracle.jdbc.driver.OracleDriver
   ]]
Feb 26, 2011 12:50:31 AM UpdateProfileMain main
WARNING:  Arun Could not load profiles : No Persistence provider for EntityManager named usinghibernate
Feb 26, 2011 12:50:31 AM UpdateProfileMain main
WARNING:  Arun Could not load profiles : null

Answer 1

org.hibernate.ejb.HibernatePeristence

应该被

取代

org.hibernate.ejb.HibernatePersistence
                              ^---

EntityManager没有持久性提供程序 - 臭名昭着的错误

1 个答案: