Erro getId

Olá pessoal estou tentando implementar o id como autoincremento na minha classe usuario só que está dando o seguinte erro:

Mapping:

&lt;hibernate-mapping&gt;
    &lt;class name="entidades.Usuario" table="usuario"&gt;
        &lt;id name="id" column="id"&gt;        
            &lt;generator class="increment"/&gt;
        &lt;/id&gt;
       
        &lt;property name="nome" column="nome"/&gt;
        &lt;property name="sexo" column="sexo"/&gt;
        &lt;property name="dataNasc" column="dataNasc"/&gt;
        &lt;property name="setor" column="setor"/&gt;
        &lt;property name="login" column="login"/&gt;
        &lt;property name="senha" column="senha"/&gt;
           
    &lt;/class&gt;
&lt;/hibernate-mapping&gt;

Classe para testar a inclusão:

public class Teste { 
    private UsuarioDAO uDAO = DAOFactory.getInstance().getUsuarioDAO();
    
    public Teste(){
        testar();
    }
    
    public void testar(){
        
        Usuario u1 = new Usuario();
        
        u1.setNome("João");
        u1.setSexo("f");
        u1.setDataNasc("05/10/1985");
        u1.setSetor("cap");
        u1.setLogin("joao");
        u1.setSenha("123456");
        
        try{
            
            SessionFactory session = null;
            
            session = new Configuration()
                .configure("hibernate.cfg.xml" )
                .buildSessionFactory();             
          
            
            uDAO.save( u1 );
            System.out.println("Nome: " + u1.getId());
            session.close(); 

    }catch(HibernateException e1){
        e1.printStackTrace();
    }
}   
     
    public static void main(String[] args){
        Teste teste = new Teste();        
        
    }
    
}

Erro:

Compiling 1 source file to D:\Estudos_Java\TCC\build\classes
compile-single:
run-single:
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
org.hibernate.PropertyAccessException: Exception occurred inside getter of entidades.Usuario.id
        at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:148)
        at org.hibernate.engine.UnsavedValueFactory.getUnsavedIdentifierValue(UnsavedValueFactory.java:44)
        at org.hibernate.tuple.PropertyFactory.buildIdentifierProperty(PropertyFactory.java:44)
        at org.hibernate.tuple.EntityMetamodel.&lt;init&gt;(EntityMetamodel.java:115)
        at org.hibernate.persister.entity.AbstractEntityPersister.&lt;init&gt;(AbstractEntityPersister.java:411)
        at org.hibernate.persister.entity.SingleTableEntityPersister.&lt;init&gt;(SingleTableEntityPersister.java:108)
        at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
        at org.hibernate.impl.SessionFactoryImpl.&lt;init&gt;(SessionFactoryImpl.java:215)
        at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1152)
        at teste.Teste.testar(Teste.java:45)
        at teste.Teste.&lt;init&gt;(Teste.java:27)
        at teste.Teste.main(Teste.java:60)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:145)
        ... 11 more
Caused by: java.lang.NullPointerException
        at entidades.Usuario.getId(Usuario.java:40)
        ... 16 more
BUILD SUCCESSFUL (total time: 2 seconds)

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