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POOpenJPA creating EntityManager in code without persistence.xml, with properties
 

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    <p>I need to create EntityManager in code without persistence.xml ... I have </p> <pre><code> props.put("openjpa.ConnectionURL", "jdbc:sqlserver://databasehost:3306; DatabaseName=dbname; selectMethod=cursor;create=true"); props.put("openjpa.ConnectionDriverName","com.mysql.jdbc.Driver"); props.put("openjpa.ConnectionUserName", "dbname"); props.put("openjpa.ConnectionPassword", "password"); props.put("openjpa.jdbc.SynchronizeMappings", "buildSchema"); props.put("openjpa.Log", "DefaultLevel=WARN, Runtime=INFO, Tool=INFO, SQL=TRACE"); props.put("openjpa.RuntimeUnenhancedClasses", "supported"); EntityManagerFactory factory = Persistence.createEntityManagerFactory("wp"); em = factory.createEntityManager(props); </code></pre> <p>..and when em = factory.createEntityManager(props) is called I get : </p> <pre> javax.persistence.PersistenceException: No persistence providers available for "wp" after trying the following discovered implementations: org.apache.openjpa.persistence.PersistenceProviderImpl at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:182) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:72) at dao.wp.WP_EMH.getCurrentEntityManager(WP_EMH.java:27) </pre> <p>I understand that there is no mention about something that is in persistence.xml represented by tag </p> <p>PROVIDER- org.apache.openjpa.persistence.PersistenceProviderImpl - /PROVIDER</p> <p>How should I add this to Properties? Or how to solve it? And my second question is that in persistence.xml are added classes of entities. How to solve this with properties?</p> <p>thanks</p>
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    1. COPlease don't set openjpa.RuntimeUnenhancedClasses=supported ... that will bite you sometime down the road. The better bet is to configure build time enhancement.
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