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POUsing both OpneJPA and Hibernate in OSGI environment
 

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  1. POUsing both OpneJPA and Hibernate in OSGI environment
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    <p>I am writing a modules to persist some data and used <code>OpenJPA</code> as the persistence provider. But now I want to give a configuration option for user to switch between <code>OpenJPA</code> and <code>hibernate</code>. So I wrote a new DaoFactory classes to create <code>EntityManagerFactory</code> and created new persistence unit (<code>My-PU-Hibernate</code>) in <code>persistence.xml</code> for hibernate.</p> <p>Now problem occurs when I create the EntityManagerFactory. My code is,</p> <pre><code>Persistence.createEntityManagerFactory("My-PU-Hibernate", hibernatePropertyMap); </code></pre> <p>My persistence.xml</p> <pre><code>&lt;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"&gt; &lt;persistence-unit name="My-PU-OpenJPA" transaction-type="RESOURCE_LOCAL"&gt; &lt;class&gt;org.example.testproject.jpa.openjpa.entity.AttachmentDAOImpl&lt;/class&gt; &lt;/persistence-unit&gt; &lt;persistence-unit name="My-PU-Hibernate" transaction-type="RESOURCE_LOCAL"&gt; &lt;provider&gt;org.hibernate.ejb.HibernatePersistence&lt;/provider&gt; &lt;class&gt;org.example.testproject.jpa.openjpa.entity.AttachmentDAOImpl&lt;/class&gt; &lt;/persistence-unit&gt; &lt;/persistence&gt; </code></pre> <p>My Hibernate property map is, </p> <pre><code>"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" </code></pre> <p>This picks the OpneJPA <code>PersistenceProvider</code> as the correct persistence provider and creates a EntityManagerFactory from OpenJPA persistance provider. It also gives following warning when it is creating the EntityManagerFactory. </p> <pre><code>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". </code></pre> <p>So when I try to create a entity manager, it gives following error. </p> <pre><code>&lt;openjpa-2.2.0-wso2v1-r128166:129108 fatal user error&gt; 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) </code></pre> <p>I think above warning and error occurred due to selecting wrong PersistenceProvider. I have debuged the code and verified that hibernate persistence provider also loaded in the OSGI environment. I used <code>geronimo-jpa_2.0_spec</code> <code>v1.0</code> as javax.persistence vendor.</p> <p>Any thoughts on how to select correct persistence provider?</p>
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    1. USHasitha Aravinda
    1. USHasitha Aravinda
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