在OSGI环境中同时使用OpneJPA和Hibernate

Question

我正在编写一个模块来持久化一些数据，并使用OpenJPA作为持久化提供程序。但是现在我想给用户一个配置选项来在OpenJPA和hibernate之间切换。所以我写了一个新的DaoFactory类来创建EntityManagerFactory，并在hibernate的persistence.xml中创建了新的持久性单元（My-PU-Hibernate）。

现在，当我创建EntityManagerFactory时，问题出现了。我的密码是，

Persistence.createEntityManagerFactory("My-PU-Hibernate", hibernatePropertyMap);

我的坚持。xml

<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="My-PU-OpenJPA" transaction-type="RESOURCE_LOCAL">
        <class>org.example.testproject.jpa.openjpa.entity.AttachmentDAOImpl</class>
    </persistence-unit>

    <persistence-unit name="My-PU-Hibernate" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>org.example.testproject.jpa.openjpa.entity.AttachmentDAOImpl</class>
    </persistence-unit>

</persistence>

我的Hibernate属性地图是，

"hibernate.connection.datasource", datasource
"hibernate.dialect", "org.hibernate.dialect.MySQLDialect"
"hibernate.hbm2ddl.auto","update"
"hibernate.cache.provider_class", "org.hibernate.cache.NoCacheProvider"
"hibernate.cache.use_query_cache", "false"
"hibernate.cache.use_second_level_cache", "false"

这将选择OpneJPAPersistenceProvider作为正确的持久性提供程序，并从OpenJPA持久性提供程序创建EntityManagerFactory。它在创建EntityManagerFactory时还会发出以下警告。

WARN   [Start Level Event Dispatcher] openjpa.Runtime - The configuration property named "openjpa.Id" was not recognized and will be ignored, although the name closely matches a valid property called "openjpa.Id".

因此，当我尝试创建实体管理器时，它会给出以下错误。

<openjpa-2.2.0-wso2v1-r128166:129108 fatal user error> org.apache.openjpa.persistence.ArgumentException: A JDBC Driver or DataSource class name must be specified in the ConnectionDriverName property. Available properties in configuration are "org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl@442ce698".
at org.apache.openjpa.jdbc.schema.DataSourceFactory.newDataSource(DataSourceFactory.java:72)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.createConnectionFactory(JDBCConfigurationImpl.java:844)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getDBDictionaryInstance(JDBCConfigurationImpl.java:602)
at org.apache.openjpa.jdbc.meta.MappingRepository.endConfiguration(MappingRepository.java:1510)
at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:518)
at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:443)
at org.apache.openjpa.lib.conf.PluginValue.instantiate(PluginValue.java:104)
at org.apache.openjpa.conf.MetaDataRepositoryValue.instantiate(MetaDataRepositoryValue.java:68)
at org.apache.openjpa.lib.conf.ObjectValue.instantiate(ObjectValue.java:83)
at org.apache.openjpa.conf.OpenJPAConfigurationImpl.newMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:968)
at org.apache.openjpa.conf.OpenJPAConfigurationImpl.getMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:959)
at org.apache.openjpa.kernel.AbstractBrokerFactory.makeReadOnly(AbstractBrokerFactory.java:638)
at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:203)
at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:156)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:227)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:154)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:60)

我认为上述警告和错误是由于选择了错误的持久性提供程序而发生的。我已经调试了代码，并验证了Hibernate持久性提供程序也加载在OSGI环境中。我使用geronimo-jpa_2.0_specv1.0作为javax.persistence供应商。

关于如何选择正确的持久性提供程序，您有什么想法吗？

Answer 1

我能够通过修正逻辑来修正这个问题，如下所示。IMO这不是正确的修复，因为EJB3配置已被弃用。我们需要找到一个合适的解决方案。

//Imports
import org.hibernate.ejb.Ejb3Configuration;
import org.hibernate.ejb.HibernatePersistence;

//My Logic   
        Ejb3Configuration cfg = new Ejb3Configuration();
        cfg.addAnnotatedClass(AttachmentDAOImpl.class);
        this.entityManagerFactory = cfg.createEntityManagerFactory(propertyMap);