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 Post subject: Error type MappingException after save in GWT web app
PostPosted: Mon Feb 29, 2016 6:43 pm 

Joined: Mon Feb 29, 2016 6:00 pm
Posts: 2
I use Hibernate (v. 4.3.10) in a GWT application. I use RequestFactory for the client/server communication. For each data model object, i have a class and an interface "style" proxy.
I send a query to save my model named Intervention. The save is Ok without error. For the save, i use hibernate method saveOrUpdate().
This query return the object saved but when the object is transformed in Proxy, i have an error type MappingExeption for the entity Exercice, which is an attribute in my model Intervention.
Before the save, the same Intervention is loaded in application without error with the same call method server side. After the save, i call the same method get for reload the intervention.
The error occur in the method find() in the class BeanLocator, it is used by GWT for transform class object in proxy .

Can you help me for solve this problem ?

Thank you

In the next, a part of the code of BeanLocator, a part of the object Intervention and Exercice, a part of the mapping in the file hibernate.cfg.xml and the stackTrace error

Class Intervention :

package com.tbmaestro.ttt.server.model.entity.intervention;


@Entity(name = "Intervention")
@Table(name = "intervention")
public class Intervention extends AbstractBean {

private static final long serialVersionUID = 1L;
private Exercice exercice;
private Exercice exerciceRetroaction;
private Exercice exerciceCreation; // voir les commentaires sur la BD


public Intervention() {


@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "EXERCICE_ID")
public Exercice getExercice() {
return exercice;

public void setExercice(Exercice exercice) {
this.exercice = exercice;

@ManyToOne(fetch = FetchType.LAZY)
public Exercice getExerciceRetroaction() {
return this.exerciceRetroaction;

public void setExerciceRetroaction(Exercice exerciceRetroaction) {
this.exerciceRetroaction = exerciceRetroaction;

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "EXERCICE_CREATION_ID")
public Exercice getExerciceCreation() {
return exerciceCreation;

public void setExerciceCreation(Exercice exerciceCreation) {
this.exerciceCreation = exerciceCreation;


Class Exercice :

package com.tbmaestro.ttt.server.model;

@Entity(name = "Exercice")
@Table(name = "exercice")
public class Exercice extends AbstractBean {

private static final long serialVersionUID = 1L;
private Date dateProjet = new Date();
private String statut = "";

public Exercice() {

@Column(name = "DATE_PROJET")
public Date getDateProjet() {
return dateProjet;

public void setDateProjet(Date dateProjet) {
this.dateProjet = dateProjet;

@Column(name = "ETAT")
public String getStatut() {
return statut;

public void setStatut(String statut) {
this.statut = statut;


Part of the file hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<!-- Models -->
<mapping class="com.tbmaestro.ttt.server.model.Exercice" />
<mapping class="com.tbmaestro.ttt.server.model.entity.intervention.Intervention" />

Class BeanLocator and method find()

public class BeanLocator extends Locator<AbstractBean, Integer> {


public AbstractBean find(Class<? extends AbstractBean> clazz, Integer id) {
try {
logger.debug("find class " + clazz + " id " + id);
Session session = HibernateUtil.getCurrentSession();
AbstractBean instance = (AbstractBean) session.get(clazz, id);
return instance;
} catch (Exception e) {
throw new RuntimeException(e.getMessage());


StackTrace of the error :

SEVERE: Unexpected error
com.tbmaestro.ttt.shared.CustomRuntimeException: Unknown entity: com.tbmaestro.ttt.server.model.Exercice_$$_jvst7a6_1
at com.tbmaestro.ttt.server.model.BeanLocator.find(BeanLocator.java:38)
at com.tbmaestro.ttt.server.model.BeanLocator.find(BeanLocator.java:1)
at com.google.web.bindery.requestfactory.shared.Locator.isLive(Locator.java:96)
at com.google.web.bindery.requestfactory.server.LocatorServiceLayer.doIsLive(LocatorServiceLayer.java:188)
at com.google.web.bindery.requestfactory.server.LocatorServiceLayer.isLive(LocatorServiceLayer.java:85)
at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.isLive(ServiceLayerDecorator.java:116)
at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.isLive(ServiceLayerDecorator.java:116)
at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.createReturnOperations(SimpleRequestProcessor.java:282)
at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:240)
at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:135)
at com.google.web.bindery.requestfactory.server.RequestFactoryServlet.doPost(RequestFactoryServlet.java:133)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
at com.tbmaestro.ttt.server.servlet.CustomRequestFactoryServlet.service(CustomRequestFactoryServlet.java:67)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)
at com.tbmaestro.ttt.server.servlet.RevalidateCacheFilter.doFilter(RevalidateCacheFilter.java:45)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at com.tbmaestro.ttt.server.servlet.CharsetFilter.doFilter(CharsetFilter.java:29)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:68)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Unknown Source)

 Post subject: Re: Error type MappingException after save in GWT web app
PostPosted: Tue Mar 01, 2016 12:41 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1630
Location: Romania
You need to unproxy to get the actual class of the entity.

 Post subject: Re: Error type MappingException after save in GWT web app
PostPosted: Tue Mar 01, 2016 1:20 pm 

Joined: Mon Feb 29, 2016 6:00 pm
Posts: 2
The transformation in proxy and unproxy is managed by GWT and the requestFactory.
I get the class of the entity and not the proxy

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