Criar projeto JPA sem o persistence.xml ?

@fernandopaiva escreveu:

Criei um projeto Swing com JPA que esta funcionando bem. Agora quero retirar o arquivo persistence.xml e usar o EntityManager programaticamente. Para isso, estou tentando criar o EntityManagerFactory mas nao esta funcionando, sempre retorna nulo. Como resolver esse problema ?

Estou tentando assim.

public class JPAUtils {  
    private static EntityManagerFactory emf;
    
    /** retorna o EntityManagerFactory */
    public static EntityManagerFactory getEntityManagerFactory(){        
        if(emf == null){
            PersistenceProvider pp = new PersistenceProvider();
            Map<String, Object> properties = new HashMap<String, Object>();
            properties.put(PersistenceUnitProperties.TRANSACTION_TYPE, PersistenceUnitTransactionType.RESOURCE_LOCAL.name());                      
            properties.put(PersistenceUnitProperties.JDBC_DRIVER, "com.mysql.jdbc.Driver");
            properties.put(PersistenceUnitProperties.JDBC_URL, "jdbc:mysql://localhost:3306/iguanaauto_db?createDatabaseIfNotExist=true");
            properties.put(PersistenceUnitProperties.JDBC_USER, "root");
            properties.put(PersistenceUnitProperties.JDBC_PASSWORD, "");
            properties.put(PersistenceUnitProperties.DDL_GENERATION, PersistenceUnitProperties.CREATE_OR_EXTEND);
            properties.put(PersistenceUnitProperties.DDL_GENERATION_MODE, PersistenceUnitProperties.DDL_DATABASE_GENERATION);
            properties.put(PersistenceUnitProperties.LOGGING_LEVEL, Level.FINE);            
            emf = pp.createEntityManagerFactory("default", properties);
        }
        return emf;
    }
    
}

Aqui o GenericDAO

public class GenericDAO<T> implements IPersistence<T>{
    private EntityManager em;

    public GenericDAO() {
        em = JPAUtils.getEntityManagerFactory().createEntityManager();
    }    
    

    @Override
    public void insert(T obj) {
        try{
            em.getTransaction().begin();
            em.persist(obj);
            em.getTransaction().commit();
        }catch(PersistenceException e){
            JOptionPane.showMessageDialog(null, e.getLocalizedMessage(), "Erro de insert", JOptionPane.ERROR_MESSAGE);
        }    
    }

    @Override
    public void update(T obj) {
        try{
            em.getTransaction().begin();
            em.merge(obj);
            em.getTransaction().commit();
        }catch(Exception e){
            JOptionPane.showMessageDialog(null, e.getLocalizedMessage(), "Erro de update", JOptionPane.ERROR_MESSAGE);
        }
    }

    @Override
    public void delete(T obj) {
        try{
            em.getTransaction().begin();
            em.remove(obj);
            em.getTransaction().commit();
        }catch(Exception e){
            JOptionPane.showMessageDialog(null, e.getLocalizedMessage(), "Erro de delete", JOptionPane.ERROR_MESSAGE);
        }
        
    }

    @Override
    public EntityManager getSession() {
        return em;
    }
    
}

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