Hello everyone,
I have a class Employee (Parent) is MasterdData (Child).
The code of classes is at the end of the message.
When I try to write to the datastore:
Employee employee = new Employee ();
setMethod for employee use
MasterData masterData = new MasterData ();
method for use in September masterData istance
employee.setData (masterData);
PMF.get (). GetPersistenceManager (). MakePersistent (employe);
I get the error:
java.lang.IllegalStateException: Primary key for object of type
MasterData is null
Who helps me?
Thanks
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Employee {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long ID;
@Persistent
private Key masterData;
@Persistent
private String name;
private String lastName;
@Persistent(mappedBy = "employee")
private MasterData data;
public Employee(String nome, String cognome, MasterData data) {
this.name = nome;
this.lastName = cognome;
this.data = data;
}
public Long getID() {
return ID;
}
public void setID(Long ID) {
this.ID = ID;
}
public Key getMasterData() {
return masterData;
}
public void setMasterData(Key masterData) {
this.masterData = masterData;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public MasterData getData() {
return data;
}
public void setData(MasterData data) {
this.data = data;
}
}
@PersistenceCapable(identityType= IdentityType.APPLICATION)
public class MasterData {
@Persistent(valueStrategy= IdGeneratorStrategy.IDENTITY)
@PrimaryKey
private Key ID;
@Persistent
private Date dateOfBirth;
@Persistent
private String homeTown;
@Persistent
private String provinceTown;
@Persistent
private String cf;
@Persistent
private Employee employee;
public MasterData(Date dateOfBirth, String homeTown, String
provinceTown, String cf) {
this.dateOfBirth = dateOfBirth;
this.homeTown = homeTown;
this.provinceTown = provinceTown;
this.cf = cf;
}
public Key getID() {
return ID;
}
public void setID(Key ID) {
this.ID = ID;
}
public Date getDateOfBirth() {
return dateOfBirth;
}
public void setDateOfBirth(Date dateOfBirth) {
this.dateOfBirth = dateOfBirth;
}
public String getHomeTown() {
return homeTown;
}
public void setHomeTown(String homeTown) {
this.homeTown = homeTown;
}
public String getProvinceTown() {
return provinceTown;
}
public void setProvinceTown(String provinceTown) {
this.provinceTown = provinceTown;
}
public String getCf() {
return cf;
}
public void setCf(String cf) {
this.cf = cf;
}
public Employee getEmployee() {
return employee;
}
public void setEmployee(Employee employee) {
this.employee = employee;
}
}
public final class PMF {
private static final PersistenceManagerFactory pmfInstance =
JDOHelper.getPersistenceManagerFactory("transactions-
optional");
private PMF() {}
public static PersistenceManagerFactory get() {
return pmfInstance;
}
}
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