JPA with TopLink: No META-INF/persistence.xml was found in classpath

public class LoginTest {

public static void main(String[] args) {
    EntityManagerFactory emf = Persistence.createEntityManagerFactory("IRCBotPU");
    EntityManager em = emf.createEntityManager();

    em.getTransaction().begin();

    Login lg = new Login();
    lg.setPassword("password");
    lg.setUserName("Rocky");

    em.persist(lg);
    em.flush();

    Login st = em.find(Login.class, lg.getPassword());
    System.out.println(st);

    em.getTransaction().commit();

    em.close();
    emf.close();

}
}

I'm getting an Exception when I try to run this class

javax.persistence.PersistenceException: No Persistence provider for EntityManager named IRCBotPU:  
   No META-INF/persistence.xml was found in classpath.

META-INF/persistence.xml is in my classpath. I don't know what is the reason or this exception.

Persistence library is TopLink.

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1 Answer

Your META-INF/persistence.xml file should look something like this:

// <persistence>
//   <persistence-unit name="IRCBotPU">
//     <provider>oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider</provider>
//     <!-- All persistence classes must be listed -->
//     <class>entity.Customer</class>
//     <class>entity.Order</class>
//     <class>entity.Item</class>
//     <properties>
//       <!-- Provider-specific connection properties -->
//       <property name="toplink.jdbc.driver" value="<database driver>"/>
//       <property name="toplink.jdbc.url" value="<database url>"/>
//       <property name="toplink.jdbc.user" value="<user>"/>
//       <property name="toplink.jdbc.password" value="<password>"/>
//       <!-- Provider-specific settings -->
//       <property name="toplink.logging.level" value="INFO"/>
//     </properties>
//   </persistence-unit>
// </persistence>

Your persistence-unit's name attribute in your persistence.xml doesn't match the value you're passing into the Persistence.createEntityManagerFactory method. Make sure that your persistence-unit name is set to "IRCBotPU".

answered 2009-08-14T17:49:00.477

JPA with TopLink: No META-INF/persistence.xml was found in classpath

1 Answer

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