I have a problem with GW and Hibernate,
in my database , I have Sinav(Exam) and Soru(Question) tables and a
mid-table called sinav_soru(Exam_Question) , when i want to reach the
exam list from the database using Hibernate the error occurs , please
help.
Thanks in advance.
Here's the error 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)
I really could'n fix the problem.
here's my domain code ;
Sinav.java (Exam)
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 (Question)
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;
}
}
Here's the code that i get the exam list ;
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" );
}
} );
}
}
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