1

我正在使用休眠实体管理器。它抱怨它找不到持久性提供程序,但仍将其记录在日志中:

    TRACE 2011-02-21 22:17:52,843 [main](Ejb3Configuration.java:321) org.hibernate.ejb.Ejb3Configuration - PersistenceMetadata(version=2.0) [
        name: sample
        jtaDataSource: null
        nonJtaDataSource: null
        transactionType: RESOURCE_LOCAL
        provider: org.hibernate.ejb.HibernatePeristence
        useQuotedIdentifiers: false
        classes[
        ]
        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.archive.autodetection: class, hbm
            hibernate.connection.driver_class: oracle.jdbc.driver.OracleDriver
        ]]
    Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named sample
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
        at EMPersistDemo2.main(EMPersistDemo2.java:26)

很明显,它找到了它,记录了它......但仍然抛出了那个异常。我错过了什么吗?

我正在使用 maven,并将 persistence.xml 放在 src/main/resources/META-INF 中。它的内容是:

    <!-- persistence.xml -->
    <persistence ...>
       <persistence-unit name="sample">
        <provider>org.hibernate.ejb.HibernatePeristence</provider>
        <!-- Scan for annotated classes and Hibernate mapping XML files -->
        <properties>
           <property name="hibernate.archive.autodetection" value="class, hbm"/>
           <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>

org.hibernate.Ejb3Configuration 能够找到它 javax.persitence.Persistence 无法找到它:

EntityManagerFactory emf = Persistence.createEntityManagerFactory("sample");
4

3 回答 3

3

我也遇到了同样的问题,但我得到了一个解决方案:缺少 META-INF/services/javax.persistence.spi.PersistenceProvider 文件。对于休眠,它位于 hibernate-entitymanager-XXX.jar 中,因此,如果 hibernate-entitymanager-XXX.jar 不在您的类路径中,您也会收到此错误。

于 2013-07-04T18:46:01.660 回答
2

我在 java coderanch 上找到了我的问题的答案。

我的持久性提供者的名字中有一个错字persistence.xml

我改名org.hibernate.ejb.HibernatePeristence

org.hibernate.ejb.HibernatePersistence
                              ^---

它开始工作了。

我发布我的答案,以便对其他人有所帮助。

于 2011-02-26T23:27:44.290 回答
0

smells like the hibernate jar files are not in the classpath since the error message says "persistence provider not found"

于 2011-02-22T07:00:54.680 回答