在OSGI环境中同时使用OpneJPA和Hibernate

我正在编写一个模块来保存一些数据，并使用OpenJPA作为持久性提供程序。但是现在我想给出一个配置选项供用户在OpenJPA和hibernate之间切换。于是我写了一个新的DaoFactory类来创建EntityManagerFactory并在persistence.xml中为hibernate创建了新的持久性单元（My-PU-Hibernate）。在OSGI环境中同时使用OpneJPA和Hibernate

现在，当我创建EntityManagerFactory时会发生问题。我的代码，

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

我的persistence.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Hibernate的属性地图，

"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"

此挑选OpneJPA PersistenceProvider为正确的持久性提供和创建了一个从EntityManagerFactory的OpenJPA持久性提供者。它在创建EntityManagerFactory时也会发出以下警告。

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".

所以，当我尝试创建一个实体管理器，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 "[email protected]". 
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)

我觉得上面的警告和错误发生是由于选择了错误的PersistenceProvider。我放弃了代码，并验证了也在OSGI环境中加载了hibernate持久性提供程序。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者的想法？

来源

2013-10-13 Hasitha Aravinda

我能够通过如下修复逻辑来解决问题。国际海事组织这是不正确的修复，因为Ejb3Configuration已弃用。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);

来源

2013-10-14 08:44:13

在OSGI环境中同时使用OpneJPA和Hibernate

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