I have two Entities. Car and Person. Car have a List of 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;
private List<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!
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