I am using eclipse IDE with google app engine as my application
server.
I hav 2 classes trains and cabins which are mapped by OneToMany
relationship
When i provide the values and after assigning the concerned fields
using the setter methods i persisted the train entity.
The train entity is correctly persisted but regarding the cabin its
not getting created and i am not able to find the data.
Instead there is another entity class created where these transactions
are maintained but the cabin entity is not created at all.
Pls help me
I am providing the code for these 2 classes.:
Train.java
@Entity(name="Train")
public class Train implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String tname, src, destn, tdate, ttime;
@OneToMany(mappedBy="train", cascade=CascadeType.ALL)
@JoinColumn(name="TrainID")
public static Collection<Acabin> acabins;
public Collection<Acabin> getAcabin() {
return acabins;
}
public void setAcabin(Collection<Acabin> acabin) {
acabins = acabin;
}
public String getDestn() {
return destn;
}
public void setDestn(String destn) {
this.destn = destn;
}
public String getSrc() {
return src;
}
public void setSrc(String src) {
this.src = src;
}
public String getTdate() {
return tdate;
}
public void setTdate(String tdate) {
this.tdate = tdate;
}
public String getTname() {
return tname;
}
public void setTname(String tname) {
this.tname = tname;
}
public String getTtime() {
return ttime;
}
public void setTtime(String ttime) {
this.ttime = ttime;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public static Train tr;
public static Acabin ac;
//public static Collection <Acabin> acabins;
public static Train addTrain(String src, String destn, String
tname, String tdate, String ttime, int ac3, int ac2, int sleeper) {
EntityManager
em=TrainService.getTrainFactory().createEntityManager();
tr=new Train();
ac=new Acabin();
tr.setTname(tname);
tr.setSrc(src);
tr.setDestn(destn);
tr.setTdate(tdate);
tr.setTtime(ttime);
ac.setName("AC 3 Tier");
ac.setAvail(ac3);
ac.setPrice(600);
acabins=new ArrayList<Acabin>();
acabins.add(ac);
ac=new Acabin();
ac.setName("AC 2 Tier");
ac.setAvail(ac2);
ac.setPrice(400);
acabins.add(ac);
ac=new Acabin();
ac.setName("Sleeper");
ac.setAvail(sleeper);
ac.setPrice(200);
acabins.add(ac);
tr.setAcabin(acabins);
try{
em.persist(tr);
}finally{
em.close();
}
return tr;
}
}
Cabins:
package com.trains.entities;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.EntityManager;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.OneToOne;
import com.trains.service.TrainService;
@Entity(name="Acabin")
public class Acabin implements Serializable {
private static final long serialVersionUID = 1L;
public Acabin(){
EntityManager
em=TrainService.getTrainFactory().createEntityManager();
}
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private double price;
@ManyToOne(fetch=FetchType.LAZY)
private Train train;
public Train getTrain() {
return train;
}
public void setTrain(Train train) {
this.train = train;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
private int avail;
private String name;
public int getAvail() {
return avail;
}
public void setAvail(int avail) {
this.avail = avail;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
}
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