@Stateless
@Remote
public class HelloWorldBean {
     public String sayHelloWolrd() {
        return "Hello World!"
     }
}

@Remote
public interface HelloWorld {
  public void sayHelloWorld(String name);
}

@Stateful
public class ShoppingCartBean implements ShoppingCart {
  @Tx(TxType.REQUIRED) @MethodPermission({"customer"})
  public void purchase(Product product, int quantity) {...}
  @Remove void emptyCart() {...}}

@Entity
public class CustomerBean {
private Long customerId;
private String name;
private String company;
private String comment;
private Address address;
public CustomerBean() {}
@id(generate=AUTO) public Long getCustomerId() {
  return id;
}
public String setCustomerId(Long id) {
  this id=id;
}
public String getName() {
  return name;
}
public String setName() {
   this name= name;
}
...
@Dependent public Address getAddress() {
   return address;
}
public void setAddress(Address address) {
  this.address = address;
}
}

@DependentObject(access=AccessType.PROPERTY)
public class Address implements java.io.Serializable {
  private String street;
  private String state;
  private String city;
  public String getState() {
    return state;
  }
...
}

Query query = entityManager.createQuery("SELECT o FROM Orders o WHERE o.total > 10000");
query.setMaxResults(50);
Collection bigOrders = query.listResults();

@Entity
...
@NamedQuery(
  name = "getOrdersOver10000",
  queryString = "SELECT o FROM Orders o WHERE o.total > 10000"
)
public class OrderBean {
...
  Query query = entityManager.createNamedQuery("getOrdersOver10000");
  Collection bigOrders = query.listResults();
...
}

SELECT new Report(c.state, SUM(o.grandTotal)) FROM Customer c JOIN Order.customer Customer GROUP BY c.state

<ejb-ref>
<ejb-ref-name>HelloWorldEJB</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<home>HelloWolrdHome</home>
<remote>helloWorld.HelloWorld</remote>
</ejb-ref>

try {
  Context context = new InitialContext();
  HelloWorldHome helloHome = (HelloWorld) PortableRemoteObject.narrow(context.lookup ("HelloWorldEJB"),     HelloWorldHome.class);
  HelloWorld hello = helloHome.create();
....
} catch(RemoteException e) {
  // process RemoteException
} catch(NamingException e) {
  // process NamingException
} catch(CreateException e) {
  // process CreateException
}

@EJB public HelloWolrd helloWorld;

@Resource(name="DefaultDS") private javax.sql.DataSource ds;