ハイパーネートでNULL以外のプロパティがnullまたは一時的な値を参照しています

Question

私のコードを実行中に例外以下になります。私は冬眠の専門家ではなく、ちょうどそれを学び始めた。助けてください。以下のコードを正常に実行するためには、どのような変更を行う必要がありますか。私は以下のすべてのコードを追加しました。

Exception in thread "main" org.hibernate.PropertyValueException: not-null property references a null or transient value: hibernate.Student.officeAddress 
    at org.hibernate.engine.Nullability.checkNullability(Nullability.java:72) 
    at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:284) 
    at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:180) 
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121) 
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186) 
    at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33) 
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175) 
    at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27) 
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70) 
    at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535) 
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523) 
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519) 
    at hibernate.StoreData.main(StoreData.java:44) 

Student.java

package hibernate; 
import javax.persistence.AttributeOverride; 
import javax.persistence.AttributeOverrides; 
import javax.persistence.Column; 
import javax.persistence.Embedded; 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.Id; 
import javax.persistence.Lob; 
import javax.persistence.Table; 
import javax.persistence.Temporal; 
import javax.persistence.TemporalType; 

@Entity 
@Table (name="student") 
public class Student { 

@Id 
private int id; 
private String firstName; 
private String lastName; 
private java.util.Date date; 
@Embedded 
@AttributeOverrides({ 
    @AttributeOverride(name="pincode", column=@Column(name="Home_PIN_Code", nullable=false)), 
    @AttributeOverride(name="street", column=@Column(name="Home_Street", nullable=false)), 
    @AttributeOverride(name="city", column=@Column(name="Home_City", nullable=false)) 
    }) 
private Address homeAddress; 
@Embedded 
private Address officeAddress; 

public Address getHomeAddress() { 
    return homeAddress; 
} 

public void setHomeAddress(Address homeAddress) { 
    this.homeAddress = homeAddress; 
} 

public Address getOfficeAddress() { 
    return officeAddress; 
} 

public void setOfficeAddress(Address officeAddress) { 
    this.officeAddress = officeAddress; 
} 

public int getId() { 
    return id; 
} 

public void setId(int id) { 
    this.id = id; 
} 

@Column (name="FirstNAME") 
public String getFirstName() { 
    return firstName; 
} 
public void setFirstName(String firstName) { 
    this.firstName = firstName; 
} 

@Lob 
public String getLastName() { 
    return lastName; 
} 
public void setLastName(String lastName) { 
    this.lastName = lastName; 
} 

@Temporal (TemporalType.TIMESTAMP) 
public java.util.Date getDate() { 
    return date; 
} 

public void setDate(java.util.Date date2) { 
    this.date = date2; 
} 


} 

Address.java

package hibernate; 

import javax.persistence.Column; 
import javax.persistence.Embeddable; 

@Embeddable 
public class Address { 
@Column(name="Pincode",nullable=false) 
private int pincode; 
@Column(name="Street",nullable=false) 
private String street; 
@Column(name="City",nullable=false) 
private String city; 

public int getPincode() { 
    return pincode; 
} 
public void setPincode(int pincode) { 
    this.pincode = pincode; 
} 
public String getStreet() { 
    return street; 
} 
public void setStreet(String street) { 
    this.street = street; 
} 
public String getCity() { 
    return city; 
} 
public void setCity(String city) { 
    this.city = city; 
} 


} 

StoreData.java

package hibernate; 

import java.util.Date; 

import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.hibernate.Transaction; 
import org.hibernate.cfg.AnnotationConfiguration; 
import org.hibernate.cfg.Configuration; 

public class StoreData { 
public static void main(String[] args) { 

    SessionFactory sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory(); 
    Session session = sessionFactory.openSession(); 
    Transaction t=session.beginTransaction(); 

    Student e1=new Student(); 
    e1.setId(1); 
    e1.setFirstName("Majid"); 
    e1.setLastName("Khan"); 
    e1.setDate(new Date()); 

    Address ad1 = new Address(); 
    ad1.setCity("Mumbai"); 
    ad1.setPincode(400059); 
    ad1.setStreet("Marol Mahrishi Road"); 

    e1.setHomeAddress(ad1); 

    Student e2=new Student(); 
    e2.setId(2); 
    e2.setFirstName("Jayada"); 
    e2.setLastName("Bano"); 
    e2.setDate(new Date()); 

    Address ad2 = new Address(); 
    ad2.setCity("Hindaun"); 
    ad2.setPincode(322230); 
    ad2.setStreet("Islam Colony"); 

    e2.setOfficeAddress(ad2); 

    session.save(e1); 
    session.save(e2); 

    t.commit(); 
    session.close(); 
    System.out.println("successfully saved"); 


    } 
    } 

Answer 1

officeAddressあなたが学生のオブジェクトに値を初期化する際に空にすることはできません