Hibernate, Tabelle beitreten Problem (wahrscheinlich)

Question

Ich habe ein Problem mit GW und Hibernate. In meiner Datenbank habe ich Sinav(Exam) und Soru(Question) Tabellen und eine mittlere Tabelle namens sinav_soru(Exam_Question). Wenn ich die Prüfungsliste von der Datenbank mit Hibernate erreichen möchte, tritt der Fehler auf.

Hier ist der Fehler Detail

[WARN] Exception while dispatching incoming RPC call 
com.google.gwt.user.client.rpc.SerializationException: Type 'org.hibernate.collection.PersistentBag' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = [tr.edu.gsu.yds.shared.domain.Soru@307262ee] 
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:619) 
    at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) 
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:153) 
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:539) 
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:709) 
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:748) 
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:621) 
    at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) 
    at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.serialize(Collection_CustomFieldSerializerBase.java:44) 
    at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serialize(ArrayList_CustomFieldSerializer.java:39) 
    at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serializeInstance(ArrayList_CustomFieldSerializer.java:51) 
    at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serializeInstance(ArrayList_CustomFieldSerializer.java:28) 
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:740) 
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:621) 
    at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) 
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:153) 
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:539) 
    at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:616) 
    at com.google.gwt.user.server.rpc.RPC.encodeResponseForSuccess(RPC.java:474) 
    at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:571) 
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208) 
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248) 
    at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487) 
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362) 
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181) 
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729) 
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at org.mortbay.jetty.Server.handle(Server.java:324) 
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505) 
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843) 
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647) 
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211) 
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380) 
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395) 
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488) 

Wirklich konnte ich nicht das Problem beheben.

hier ist unter meiner Domain-Code angegeben:

Sinav.java (Prüfung)

package tr.edu.gsu.yds.shared.domain; 

import java.io.Serializable; 
import java.util.ArrayList; 
import java.util.List; 

import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.FetchType; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import javax.persistence.Id; 
import javax.persistence.JoinColumn; 
import javax.persistence.JoinTable; 
import javax.persistence.ManyToMany; 
import javax.persistence.ManyToOne; 
import javax.persistence.OneToMany; 
import javax.persistence.Table; 

import org.hibernate.annotations.Fetch; 
import org.hibernate.annotations.FetchMode; 

@Entity 
@Table(name = "sinav") 
public class Sinav implements Serializable 
{ 
    private static final long serialVersionUID = 1L; 

    private Integer sinavId; 
    private String sinavAd; 
    private String eklenmeTarihi; 
    private Ogretmen ogretmen; 
    private List<Ogrenci> ogrenciler = new ArrayList<Ogrenci>(); 
    private List<Soru> sorular = new ArrayList<Soru>(); 

    @Id 
    @GeneratedValue(strategy=GenerationType.IDENTITY) 
    @Column(name = "sinavId", length=10) 
    public Integer getSinavId() { 
     return sinavId; 
    } 

    public void setSinavId(Integer sinavId) { 
     this.sinavId = sinavId; 
    } 

    @Column(name = "sinavAd", nullable = false) 
    public String getSinavAd() { 
     return sinavAd; 
    } 

    public void setSinavAd(String sinavAd) { 
     this.sinavAd = sinavAd; 
    } 

    @Column(name = "eklenmeTarihi", nullable = false) 
    public String getEklenmeTarihi() { 
     return eklenmeTarihi; 
    } 


    public void setEklenmeTarihi(String eklenmeTarihi) { 
     this.eklenmeTarihi = eklenmeTarihi; 
    } 



    @ManyToOne(fetch = FetchType.EAGER) 
    @JoinColumn(name = "ogretmenNo") 
    public Ogretmen getOgretmen() { 
     return this.ogretmen; 
    } 

    public void setOgretmen(Ogretmen ogretmen) { 
     this.ogretmen = ogretmen; 
    } 

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "sinav") 
    public List<Ogrenci> getOgrenciler() 
    { 
     return ogrenciler; 
    } 

    public void setOgrenciler(List<Ogrenci> ogrenciler) 
    { 
     this.ogrenciler = ogrenciler; 
    } 


    @ManyToMany(fetch = FetchType.EAGER) 
    @Fetch(value = FetchMode.SUBSELECT) 
    @JoinTable(name = "sinav_soru", 
     joinColumns = { 
      @JoinColumn(name = "sinavId", nullable = false) 
     }, 
     inverseJoinColumns = { 
      @JoinColumn(name = "soruId", nullable = false) 
     } 
    ) 
    public List<Soru> getSorular() { 
     return sorular; 
    } 

    public void setSorular(List<Soru> sorular) { 
     this.sorular = sorular; 
    } 


} 

Soru.java (Frage)

package tr.edu.gsu.yds.shared.domain; 

import java.io.Serializable; 
import java.util.ArrayList; 
import java.util.HashSet; 
import java.util.List; 
import java.util.Set; 

import javax.persistence.CascadeType; 
import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.FetchType; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import javax.persistence.Id; 
import javax.persistence.ManyToMany; 
import javax.persistence.OneToMany; 
import javax.persistence.Table; 

@Entity 
@Table(name = "soru") 
public class Soru implements Serializable 
{ 
    private static final long serialVersionUID = 4L; 

    private Integer soruId; 
    private String soruTip; 
    private String soruMetin; 
    private String soruYardimci; 
    private Integer soruPuan; 
    private List<Cevap> cevaplar = new ArrayList<Cevap>(); 
    private List<Sinav> sinavlar = new ArrayList<Sinav>(); 

    @Id 
    @GeneratedValue(strategy=GenerationType.IDENTITY) 
    @Column(name = "soruId") 
    public Integer getSoruId() { 
     return soruId; 
    } 

    public void setSoruId(Integer soruId) { 
     this.soruId = soruId; 
    } 

    @Column(name = "soruTip", nullable = false, length=20) 
    public String getSoruTip() { 
     return soruTip; 
    } 

    public void setSoruTip(String soruTip) { 
     this.soruTip = soruTip; 
    } 

    @Column(name = "soruMetin", nullable = false, length = 65535, columnDefinition="Text") 
    public String getSoruMetin() { 
     return soruMetin; 
    } 

    public void setSoruMetin(String soruMetin) { 
     this.soruMetin = soruMetin; 
    } 

    @Column(name = "soruYardimci", nullable = false, length=45) 
    public String getSoruYardimci() { 
     return soruYardimci; 
    } 

    public void setSoruYardimci(String soruYardimci) { 
     this.soruYardimci = soruYardimci; 
    } 

    @Column(name = "soruPuan", nullable = false, length=3) 
    public Integer getSoruPuan() { 
     return soruPuan; 
    } 

    public void setSoruPuan(Integer soruPuan) { 
     this.soruPuan = soruPuan; 
    } 

    @OneToMany(mappedBy = "soru", fetch = FetchType.EAGER, cascade=CascadeType.ALL) 
    public List<Cevap> getCevaplar() { 
     return cevaplar; 
    } 

    public void setCevaplar(List<Cevap> cevaplar) { 
     this.cevaplar = cevaplar; 
    } 

    @ManyToMany(mappedBy = "sorular", fetch = FetchType.LAZY) 
    public List<Sinav> getSinavlar() { 
     return sinavlar; 
    } 

    public void setSinavlar(List<Sinav> sinavlar) { 
     this.sinavlar = sinavlar; 
    } 

} 

Hier ist der Code, den ich Holen Sie sich die Prüfungsliste;

package tr.edu.gsu.yds.client.controller.ogrenci; 

import java.util.List; 

import com.google.gwt.core.client.GWT; 
import com.google.gwt.event.dom.client.ClickEvent; 
import com.google.gwt.event.dom.client.ClickHandler; 
import com.google.gwt.user.client.Window; 
import com.google.gwt.user.client.rpc.AsyncCallback; 

import tr.edu.gsu.yds.client.remote.YdsRemoteService; 
import tr.edu.gsu.yds.client.remote.YdsRemoteServiceAsync; 
import tr.edu.gsu.yds.client.view.ogrenci.sinavislemleri.OgrenciWritingSoruSayfasi; 
import tr.edu.gsu.yds.shared.domain.Sinav; 
import tr.edu.gsu.yds.shared.domain.SinavTakvim; 
import tr.edu.gsu.yds.shared.domain.Soru; 

public class OgrenciWritingSoruSayfasiController 
{ 

    private YdsRemoteServiceAsync ydsRemoteServiceAsync = GWT.create(YdsRemoteService.class); 
    private OgrenciWritingSoruSayfasi ogrenciWritingSoruSayfasi; 

    public OgrenciWritingSoruSayfasiController(OgrenciWritingSoruSayfasi ogrenciWritingSoruSayfasi) 
    { 
     this.ogrenciWritingSoruSayfasi = ogrenciWritingSoruSayfasi; 

    } 

    public void send(){ 

     ydsRemoteServiceAsync.getSinavList(new AsyncCallback<List<Sinav>>() 
     { 

      @Override 
      public void onSuccess(List<Sinav> result) 
      { 
       for (Sinav sinav : result) 
       { 
        //Just to see , returning results. 
        Window.alert("sinav " + sinav.getSinavId()); 

       }    
      } 

      @Override 
      public void onFailure(Throwable caught) 
      { 
       Window.alert("Failure"); 

      } 
     }); 
     ogrenciWritingSoruSayfasi.getOgrenciWritingWidget().getOkayButton().addClickHandler(new ClickHandler() 
     { 

      @Override 
      public void onClick(ClickEvent event) 
      { 
       ogrenciWritingSoruSayfasi.getOgrenciWritingWidget().getSoruMetniLabel().setText("Basıldı"); 

      } 
     }); 


    } 

} 

Answer 1

tauschen diese:

private List<Ogrenci> ogrenciler = new ArrayList<Ogrenci>(); 
private List<Soru> sorular = new ArrayList<Soru>(); 

mit:

private Set<Ogrenci> ogrenciler = new HashSet<Ogrenci>(); 
private Set<Soru> sorular = new HashSet<Soru>(); 

Und in ähnlicher Weise die Listen in der anderen Klasse Entity.

Schauen Sie sich auf diesen Link: Serializable Hibernate data object for GWT RPC

Answer 2

Ich bin nicht sicher, aber nach mir von anderer Frage der Antworten lesen Sie vergessen, Ihren Standard (Null) Argument Konstruktor hinzuzufügen. Können Sie es nach dem Hinzufügen noch einmal versuchen?

Answer 3

Diese Variablen auslassen und ihre jeweiligen Methoden funktionieren nicht mit GWT.

private List<Ogrenci> ogrenciler = new ArrayList<Ogrenci>(); 
private List<Soru> sorular = new ArrayList<Soru>(); 

weder

private Set<Ogrenci> ogrenciler = new HashSet<Ogrenci>(); 
private Set<Soru> sorular = new HashSet<Soru>(); 

Theres verschiedene Lösungen zur Verfügung, das heißt Planierraupe, Gilead usw. Sie können auch getbyids Methoden, um diese Ergebnisse zur Vereinfachung verwenden.