Well, that could be a perfectly valid argument if stacktraces were capable of lying. Something's null. Denial won't get you anywhere. Something on line 19 is null. Use your debugger and find out what, then trace backwards until you find where/why. Or attack it from the other direction: start with a blank slate and add code piece by piece until you reproduce the problem. The last thing you changed is probably the culprit.
On Fri, Oct 2, 2009 at 12:50 PM, The Coder <[email protected]> wrote: > > Its not null. Observe it: > > Client-Side: > > Car car = new Car(); > List<Person> listPerson = new ArrayList<Person>(); > car.setName("Ferrari"); > car.setType("Sport"); > Person personDriver = new Person(); > personDriver.setName("James"); > person personPassenger = new Person(); > personPassenger.setName("Victoria"); > listPerson.add(personDriver); > listPerson.add(personPassenger); > car.setPersonList(listPerson); > > Null? Where? Its instantiate and populated with Person! > > > On 1 out, 13:38, Isaac Truett <[email protected]> wrote: >> Because a pointer referenced on line 19 was null. >> >> http://publicint.blogspot.com/2009/04/nullpointerexception.html >> >> >> >> On Thu, Oct 1, 2009 at 11:56 AM, The Coder <[email protected]> wrote: >> >> > I have two Entities. Car and Person. Car have aListof Person. Its >> > just for example the problem. Well, we have it: >> >> > -- >> >> > package br.com.oxylabtech.client.model; >> >> > public class Car implements IsSerializable { >> >> > // Attributes >> > private String name; >> > private String type; >> > privateList<Person> personList; >> >> > // G&S [omitted] >> >> > package br.com.oxylabtech.client.model; >> >> > public class Person implements IsSerializable { >> >> > // Attributes >> > private String name; >> >> > // G&S [omitted] >> >> > -- >> >> > Then i have a page with a form that fills the Car and Person data, >> > something like it: >> >> > -- >> >> > Car car = new Car(); >> >List<Person> listPerson = new ArrayList<Person>(); >> >> > car.setName("Ferrari"); >> > car.setType("Sport"); >> >> > Person personDriver = new Person(); >> > personDriver.setName("James"); >> >> > person personPassenger = new Person(); >> > personPassenger.setName("Victoria"); >> >> > listPerson.add(personDriver); >> > listPerson.add(personPassenger); >> >> > car.setPersonList(listPerson); >> >> > -- >> >> > After, i need to save in the DB. I need to send to the server side >> > correct? Then, i have a service for it. Lets see: >> >> > -- >> >> > dbService.save(car, new AsyncCallback<Boolean>() { >> >> > public void onFailure(Throwable >> > caught) { >> > >> > CustomWidgets.createDialogBox("Ops!!"); //This is a Custom >> > DialogBox() >> > } >> >> > public void onSuccess(Boolean >> > result) { >> > if (result) { >> > >> > CustomWidgets.createDialogBox("Yeah!"); >> > } else { >> > >> > CustomWidgets.createDialogBox("Problem!"); >> > } >> > } >> > }); >> >> > -- >> >> > But before the save, i want to see the Car and the Persons info. The >> > server side code is simple. >> >> > -- >> >> > public Boolean save(Car car) { >> > try { >> > System.out.println("Car name: " + car.getNoma()); >> > System.out.println("Car type: " + car.getType()); >> > System.out.println(" "); >> >> > for (Person person : car.getPersonList()) { >> > System.out.println("Person: " + >> > person.getNome()); >> > } >> > return true; >> > } catch (Exception e) { >> > e.printStackTrace(); >> > return false; >> > } >> > } >> >> > -- >> >> > But it occour: >> >> > -- >> >> > Car Name: Ferrari >> > Car Type: Sport >> >> > java.lang.NullPointerException >> > at br.com.oxylabtech.server.dbService.save(ServiceImpl.java:19) >> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) >> >> > -- >> >> > Why? Thankx! > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en -~----------~----~----~----~------~----~------~--~---
