Google AppEngine Key exception
I have two classes, CarRentalCompany
@Entity
public class CarRentalCompany {
private static Logger logger = Logger.getLogger(CarRentalCompany.class.getName());
@Id
private String name;
@OneToMany(cascade = CascadeType.ALL)
private List<Car> cars;
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
private List<CarType> carTypes = new ArrayList<>(); //TODO: kan betere datastructuur zijn
/***************
* CONSTRUCTOR *
***************/
public CarRentalCompany()
{
// DEFAULT CONSTRUCTOR
}
public CarRentalCompany(String name, List<Car> cars) {
logger.log(Level.INFO, "<{0}> Car Rental Company {0} starting up...", name);
setName(name);
this.cars = cars;
for(Car car:cars)
carTypes.add(car.getType());
}
...
}
and CarType
@Entity
public class CarType {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key key;
private String name;
private int nbOfSeats;
private boolean smokingAllowed;
private double rentalPricePerDay;
//trunk space in liters
private float trunkSpace;
/***************
* CONSTRUCTOR *
***************/
public CarType()
{
}
public CarType(String name, int nbOfSeats, float trunkSpace, double rentalPricePerDay, boolean smokingAllowed) {
this.name = name;
this.nbOfSeats = nbOfSeats;
this.trunkSpace = trunkSpace;
this.rentalPricePerDay = rentalPricePerDay;
this.smokingAllowed = smokingAllowed;
}
When running the application, it throws the following exception:
NucleusFatalUserException: Attempt to assign child with key
"CarType(6614661952700416)" to parent with key
"CarRentalCompany("Hertz")". Parent keys are immutable
What do I need to do to get the key of the CarType right?
java google-app-engine jpa
edited Nov 24 '18 at 8:34
Billy Frost
1,799198
asked Nov 23 '18 at 12:28
Wouter VandenputteWouter Vandenputte
3942414
add a comment |
I have two classes, CarRentalCompany
@Entity
public class CarRentalCompany {
private static Logger logger = Logger.getLogger(CarRentalCompany.class.getName());
@Id
private String name;
@OneToMany(cascade = CascadeType.ALL)
private List<Car> cars;
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
private List<CarType> carTypes = new ArrayList<>(); //TODO: kan betere datastructuur zijn
/***************
* CONSTRUCTOR *
***************/
public CarRentalCompany()
{
// DEFAULT CONSTRUCTOR
}
public CarRentalCompany(String name, List<Car> cars) {
logger.log(Level.INFO, "<{0}> Car Rental Company {0} starting up...", name);
setName(name);
this.cars = cars;
for(Car car:cars)
carTypes.add(car.getType());
}
...
}
and CarType
@Entity
public class CarType {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key key;
private String name;
private int nbOfSeats;
private boolean smokingAllowed;
private double rentalPricePerDay;
//trunk space in liters
private float trunkSpace;
/***************
* CONSTRUCTOR *
***************/
public CarType()
{
}
public CarType(String name, int nbOfSeats, float trunkSpace, double rentalPricePerDay, boolean smokingAllowed) {
this.name = name;
this.nbOfSeats = nbOfSeats;
this.trunkSpace = trunkSpace;
this.rentalPricePerDay = rentalPricePerDay;
this.smokingAllowed = smokingAllowed;
}
When running the application, it throws the following exception:
NucleusFatalUserException: Attempt to assign child with key
"CarType(6614661952700416)" to parent with key
"CarRentalCompany("Hertz")". Parent keys are immutable
What do I need to do to get the key of the CarType right?
java google-app-engine jpa
edited Nov 24 '18 at 8:34
Billy Frost
1,799198
asked Nov 23 '18 at 12:28
Wouter VandenputteWouter Vandenputte
3942414
add a comment |
I have two classes, CarRentalCompany
@Entity
public class CarRentalCompany {
private static Logger logger = Logger.getLogger(CarRentalCompany.class.getName());
@Id
private String name;
@OneToMany(cascade = CascadeType.ALL)
private List<Car> cars;
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
private List<CarType> carTypes = new ArrayList<>(); //TODO: kan betere datastructuur zijn
/***************
* CONSTRUCTOR *
***************/
public CarRentalCompany()
{
// DEFAULT CONSTRUCTOR
}
public CarRentalCompany(String name, List<Car> cars) {
logger.log(Level.INFO, "<{0}> Car Rental Company {0} starting up...", name);
setName(name);
this.cars = cars;
for(Car car:cars)
carTypes.add(car.getType());
}
...
}
and CarType
@Entity
public class CarType {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key key;
private String name;
private int nbOfSeats;
private boolean smokingAllowed;
private double rentalPricePerDay;
//trunk space in liters
private float trunkSpace;
/***************
* CONSTRUCTOR *
***************/
public CarType()
{
}
public CarType(String name, int nbOfSeats, float trunkSpace, double rentalPricePerDay, boolean smokingAllowed) {
this.name = name;
this.nbOfSeats = nbOfSeats;
this.trunkSpace = trunkSpace;
this.rentalPricePerDay = rentalPricePerDay;
this.smokingAllowed = smokingAllowed;
}
When running the application, it throws the following exception:
NucleusFatalUserException: Attempt to assign child with key
"CarType(6614661952700416)" to parent with key
"CarRentalCompany("Hertz")". Parent keys are immutable
What do I need to do to get the key of the CarType right?
java google-app-engine jpa
edited Nov 24 '18 at 8:34
Billy Frost
1,799198
asked Nov 23 '18 at 12:28
Wouter VandenputteWouter Vandenputte
3942414
I have two classes, CarRentalCompany
@Entity
public class CarRentalCompany {
private static Logger logger = Logger.getLogger(CarRentalCompany.class.getName());
@Id
private String name;
@OneToMany(cascade = CascadeType.ALL)
private List<Car> cars;
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
private List<CarType> carTypes = new ArrayList<>(); //TODO: kan betere datastructuur zijn
/***************
* CONSTRUCTOR *
***************/
public CarRentalCompany()
{
// DEFAULT CONSTRUCTOR
}
public CarRentalCompany(String name, List<Car> cars) {
logger.log(Level.INFO, "<{0}> Car Rental Company {0} starting up...", name);
setName(name);
this.cars = cars;
for(Car car:cars)
carTypes.add(car.getType());
}
...
}
and CarType
@Entity
public class CarType {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key key;
private String name;
private int nbOfSeats;
private boolean smokingAllowed;
private double rentalPricePerDay;
//trunk space in liters
private float trunkSpace;
/***************
* CONSTRUCTOR *
***************/
public CarType()
{
}
public CarType(String name, int nbOfSeats, float trunkSpace, double rentalPricePerDay, boolean smokingAllowed) {
this.name = name;
this.nbOfSeats = nbOfSeats;
this.trunkSpace = trunkSpace;
this.rentalPricePerDay = rentalPricePerDay;
this.smokingAllowed = smokingAllowed;
}
When running the application, it throws the following exception:
NucleusFatalUserException: Attempt to assign child with key
"CarType(6614661952700416)" to parent with key
"CarRentalCompany("Hertz")". Parent keys are immutable
What do I need to do to get the key of the CarType right?
java google-app-engine jpa
java google-app-engine jpa
edited Nov 24 '18 at 8:34
Billy Frost
1,799198
asked Nov 23 '18 at 12:28
Wouter VandenputteWouter Vandenputte
3942414
edited Nov 24 '18 at 8:34
Billy Frost
1,799198
asked Nov 23 '18 at 12:28
Wouter VandenputteWouter Vandenputte
3942414
edited Nov 24 '18 at 8:34
Billy Frost
1,799198
edited Nov 24 '18 at 8:34
Billy Frost
1,799198
edited Nov 24 '18 at 8:34
Billy Frost
1,799198
1,799198
asked Nov 23 '18 at 12:28
Wouter VandenputteWouter Vandenputte
3942414
asked Nov 23 '18 at 12:28
Wouter VandenputteWouter Vandenputte
3942414
asked Nov 23 '18 at 12:28
Wouter VandenputteWouter Vandenputte
3942414
3942414
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
You are not persisting your CarRentalCompany entity before adding CarType entity. See a
similar thread here. The persist operation must be used only for new entities. An entity is new when it has never been associated with a database row, meaning that there is no table record in the database to match the entity in question.
answered Nov 23 '18 at 22:53
OmairOmair
1764
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You are not persisting your CarRentalCompany entity before adding CarType entity. See a
similar thread here. The persist operation must be used only for new entities. An entity is new when it has never been associated with a database row, meaning that there is no table record in the database to match the entity in question.
answered Nov 23 '18 at 22:53
OmairOmair
1764
add a comment |
You are not persisting your CarRentalCompany entity before adding CarType entity. See a
similar thread here. The persist operation must be used only for new entities. An entity is new when it has never been associated with a database row, meaning that there is no table record in the database to match the entity in question.
answered Nov 23 '18 at 22:53
OmairOmair
1764
add a comment |
You are not persisting your CarRentalCompany entity before adding CarType entity. See a
similar thread here. The persist operation must be used only for new entities. An entity is new when it has never been associated with a database row, meaning that there is no table record in the database to match the entity in question.
answered Nov 23 '18 at 22:53
OmairOmair
1764
You are not persisting your CarRentalCompany entity before adding CarType entity. See a
similar thread here. The persist operation must be used only for new entities. An entity is new when it has never been associated with a database row, meaning that there is no table record in the database to match the entity in question.
answered Nov 23 '18 at 22:53
OmairOmair
1764
answered Nov 23 '18 at 22:53
OmairOmair
1764
answered Nov 23 '18 at 22:53
OmairOmair
1764
answered Nov 23 '18 at 22:53
OmairOmair
1764
1764
add a comment |
add a comment |
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