1 Reply Latest reply on Dec 2, 2010 7:08 AM by wdfink

    Unable to build EntityManagerFactory with netbeans

    lolveley
    lolveley Dec 1, 2010 2:50 PM

      hello,

       

      my problem concerns the link between an EJB session 3.0 and a persistence layer : JPA entities.

       

      I use fedora 14, the computer's name is "vetiver" (name that I use for mysql e.g. in the "host" property), the IDE is netbeans 6.9.1.

       

      here is the error :

       

       

      Exception in thread "main" javax.ejb.EJBException: javax.persistence.PersistenceException: [PersistenceUnit: PAM_3_ejb_jndiPU] Unable to build EntityManagerFactory

      in the line 34 of the file MyBean.java :

       

      @Stateless
public class MyBean implements MyBeanRemote, MyBeanLocal {

    private EntityManagerFactory factory = null;

    public String sayHello() {
        return "Hello there";
    }

    // Add business logic below. (Right-click in editor and choose
    // "Insert Code > Add Business Method")
    public String save() {

        factory = Persistence.createEntityManagerFactory("PAM_3_ejb_jndiPU"); //<-- line 34
        EntityManager em = factory.createEntityManager();
        em.persist(new Employes("174012345678901"));
        em.flush();
        em.close();
        factory.close();
        return "It works!!";

    }
}

       

      here is some interesting stuff : the file capture2.jpg, linked to this post.

      you can see the libraries used by the project that contains the bean.

       

      here is the persistence.xml file :

       

       

      <?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" 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_1_0.xsd">
  <persistence-unit name="PAM_3_ejb_jndiPU" transaction-type="JTA">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <jta-data-source>java:/tutoriel3</jta-data-source>
    <class>jpa.Cotisations</class>
    <class>jpa.Employes</class>
    <class>jpa.Indemnites</class>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="hibernate.show_sql" value="true"/>
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
      <property name="hibernate.c3p0.min_size" value="5"/>
      <property name="hibernate.c3p0.max_size" value="20"/>
      <property name="hibernate.c3p0.timeout" value="300"/>
      <property name="hibernate.c3p0.max_statements" value="50"/>
      <property name="hibernate.c3p0.idle_test_period" value="3000"/>
      <property name="hibernate.hbm2ddl.auto" value="update"/>
      <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
      <property name="hibernate.connection.url" value="jdbc:mysql://vetiver:3306/tutoriel3"/>
      <property name="hibernate.connection.username" value="lolveley"/>
      <property name="hibernate.connection.password" value="***"/>
      <property name="hibernate.archive.autodetection" value="class, hbm"/>
     
      <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
    </properties>
  </persistence-unit>
</persistence>

       

       

       

      tell me if you want some extra infos.

       

      thanks,

       

      olivier.