am using jsf 2.0 + primefaces 3.2 + EJB 2.0 + JPA 2.0 .

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Asked: June 5, 20262026-06-05T07:13:54+00:00 2026-06-05T07:13:54+00:00

am using jsf 2.0 + primefaces 3.2 + EJB 2.0 + JPA 2.0 .

0

am using jsf 2.0 + primefaces 3.2 + EJB 2.0 + JPA 2.0 .
hi everyone, when i try to affect a new student to a class the system raises an error message which is trasaction abored.
my entity code : ClasseHasEtudiant

public class ClasseHasEtudiant implements Serializable {
private static final long serialVersionUID = 1L;
@EmbeddedId
protected ClasseHasEtudiantPK classeHasEtudiantPK;
@JoinColumn(name = "Etudiant_id", referencedColumnName = "id", insertable = false, updatable = false)
@ManyToOne(optional = false)
private Etudiant etudiant;
@JoinColumn(name = "Classe_id", referencedColumnName = "id", insertable = false, updatable = false)
@ManyToOne(optional = false)
private Classe classe;

public ClasseHasEtudiant() {
}

public ClasseHasEtudiant(ClasseHasEtudiantPK classeHasEtudiantPK) {
    this.classeHasEtudiantPK = classeHasEtudiantPK;
}

public ClasseHasEtudiant(int classeid, int etudiantid) {
    this.classeHasEtudiantPK = new ClasseHasEtudiantPK(classeid, etudiantid);
}

public ClasseHasEtudiantPK getClasseHasEtudiantPK() {
    return classeHasEtudiantPK;
}

public void setClasseHasEtudiantPK(ClasseHasEtudiantPK classeHasEtudiantPK) {
    this.classeHasEtudiantPK = classeHasEtudiantPK;
}

public Etudiant getEtudiant() {
    return etudiant;
}

public void setEtudiant(Etudiant etudiant) {
    this.etudiant = etudiant;
}

public Classe getClasse() {
    return classe;
}

public void setClasse(Classe classe) {
    this.classe = classe;
}

@Override
public int hashCode() {
    int hash = 0;
    hash += (classeHasEtudiantPK != null ? classeHasEtudiantPK.hashCode() : 0);
    return hash;
}

@Override
public boolean equals(Object object) {
    // TODO: Warning - this method won't work in the case the id fields are not set
    if (!(object instanceof ClasseHasEtudiant)) {
        return false;
    }
    ClasseHasEtudiant other = (ClasseHasEtudiant) object;
    if ((this.classeHasEtudiantPK == null && other.classeHasEtudiantPK != null) || (this.classeHasEtudiantPK != null && !this.classeHasEtudiantPK.equals(other.classeHasEtudiantPK))) {
        return false;
    }
    return true;
}

@Override
public String toString() {
    return "dossierEtudiants.entities.ClasseHasEtudiant[ classeHasEtudiantPK=" + classeHasEtudiantPK + " ]";
}

}

code of entity ClasseHasEtudiantPK

@Embeddable
public class ClasseHasEtudiantPK implements Serializable {
@Basic(optional = false)
@NotNull
@Column(name = "Classe_id")
private int classeid;
@Basic(optional = false)
@NotNull
@Column(name = "Etudiant_id")
private int etudiantid;

public ClasseHasEtudiantPK() {
}

public ClasseHasEtudiantPK(int classeid, int etudiantid) {
    this.classeid = classeid;
    this.etudiantid = etudiantid;
}

public int getClasseid() {
    return classeid;
}

public void setClasseid(int classeid) {
    this.classeid = classeid;
}

public int getEtudiantid() {
    return etudiantid;
}

public void setEtudiantid(int etudiantid) {
    this.etudiantid = etudiantid;
}

@Override
public int hashCode() {
    int hash = 0;
    hash += (int) classeid;
    hash += (int) etudiantid;
    return hash;
}

@Override
public boolean equals(Object object) {
    // TODO: Warning - this method won't work in the case the id fields are not set
    if (!(object instanceof ClasseHasEtudiantPK)) {
        return false;
    }
    ClasseHasEtudiantPK other = (ClasseHasEtudiantPK) object;
    if (this.classeid != other.classeid) {
        return false;
    }
    if (this.etudiantid != other.etudiantid) {
        return false;
    }
    return true;
}

@Override
public String toString() {
    return "dossierEtudiants.entities.ClasseHasEtudiantPK[ classeid=" + classeid + ", etudiantid=" + etudiantid + " ]";
}

}

this is my .xhtml code :

<ui:define name="content">
        <h:panelGroup id="messagePanel" layout="block">
            <h:messages errorStyle="color: red" infoStyle="color: green" layout="table"/>
        </h:panelGroup>
        <h:form>
            <h:panelGrid columns="2">
                <h:outputLabel value="#{bundle.CreateClasseHasEtudiantLabel_etudiant}" for="etudiant" />
                <h:selectOneMenu id="etudiant" value="#{classeHasEtudiantController.selected.etudiant}" title="#{bundle.CreateClasseHasEtudiantTitle_etudiant}" required="true" requiredMessage="#{bundle.CreateClasseHasEtudiantRequiredMessage_etudiant}">
                    <f:selectItems value="#{etudiantController.itemsAvailableSelectOne}"/>
                </h:selectOneMenu>
                <h:outputLabel value="#{bundle.CreateClasseHasEtudiantLabel_classe}" for="classe" />
                <h:selectOneMenu id="classe" value="#{classeHasEtudiantController.selected.classe}" title="#{bundle.CreateClasseHasEtudiantTitle_classe}" required="true" requiredMessage="#{bundle.CreateClasseHasEtudiantRequiredMessage_classe}">
                    <f:selectItems value="#{classeController.itemsAvailableSelectOne}"/>
                </h:selectOneMenu>
            </h:panelGrid>
            <br />
            <h:commandLink action="#{classeHasEtudiantController.create}" value="#{bundle.CreateClasseHasEtudiantSaveLink}" />
            <br />
            <br />
            <h:commandLink action="#{classeHasEtudiantController.prepareList}" value="#{bundle.CreateClasseHasEtudiantShowAllLink}" immediate="true"/>
            <br />
            <br />
            <h:commandLink value="#{bundle.CreateClasseHasEtudiantIndexLink}" action="/index" immediate="true" />
        </h:form>
    </ui:define>

and this is my managedBean code :

    public String prepareCreate() {
    current = new ClasseHasEtudiant();
    current.setClasseHasEtudiantPK(new dossierEtudiants.entities.ClasseHasEtudiantPK());
    selectedItemIndex = -1;
    return "Create";
}

public String create() {
    try {
        getFacade().create(current);
        JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle1").getString("ClasseHasEtudiantCreated"));
        return prepareCreate();
    } catch (Exception e) {
        JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle1").getString("PersistenceErrorOccured"));
        return null;
    }
}

and finaly my log :

    Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.0.v20110604-r9504): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`isetdb`.`classe_has_etudiant`, CONSTRAINT `classe_has_etudiant_ibfk_1` FOREIGN KEY (`Classe_id`) REFERENCES `classe` (`id`) ON DELETE CASCADE ON UPDATE CASCADE)
Error Code: 1452
Call: INSERT INTO classe_has_etudiant (Classe_id, Etudiant_id) VALUES (?, ?)
    bind => [2 parameters bound]
Query: InsertObjectQuery(entities.ClasseHasEtudiant[ classeHasEtudiantPK=entities.ClasseHasEtudiantPK[ classeid=0, etudiantid=0 ] ])
    at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:324)
    at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:840)
    at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeNoSelect(DatabaseAccessor.java:906)
    at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:592)
    at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:535)
    at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:1702)
    at org.eclipse.persistence.sessions.server.ClientSession.executeCall(ClientSession.java:253)
    at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:207)
    at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:193)
    at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.insertObject(DatasourceCallQueryMechanism.java:342)
    at org.eclipse.persistence.internal.queries.StatementQueryMechanism.insertObject(StatementQueryMechanism.java:162)
    at org.eclipse.persistence.internal.queries.StatementQueryMechanism.insertObject(StatementQueryMechanism.java:177)
    at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.insertObjectForWrite(DatabaseQueryMechanism.java:472)
    at org.eclipse.persistence.queries.InsertObjectQuery.executeCommit(InsertObjectQuery.java:80)
    at org.eclipse.persistence.queries.InsertObjectQuery.executeCommitWithChangeSet(InsertObjectQuery.java:90)
    at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.executeWriteWithChangeSet(DatabaseQueryMechanism.java:287)
    at org.eclipse.persistence.queries.WriteObjectQuery.executeDatabaseQuery(WriteObjectQuery.java:58)
    at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:829)
    at org.eclipse.persistence.queries.DatabaseQuery.executeInUnitOfWork(DatabaseQuery.java:728)
    at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWorkObjectLevelModifyQuery(ObjectLevelModifyQuery.java:108)
    at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWork(ObjectLevelModifyQuery.java:85)
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2863)
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1501)
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1483)
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1443)
    at org.eclipse.persistence.internal.sessions.CommitManager.commitNewObjectsForClassWithChangeSet(CommitManager.java:224)
    at org.eclipse.persistence.internal.sessions.CommitManager.commitAllObjectsWithChangeSet(CommitManager.java:123)
    at org.eclipse.persistence.internal.sessions.AbstractSession.writeAllObjectsWithChangeSet(AbstractSession.java:3784)
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabase(UnitOfWorkImpl.java:1407)
    at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.commitToDatabase(RepeatableWriteUnitOfWork.java:634)
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithChangeSet(UnitOfWorkImpl.java:1497)
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.issueSQLbeforeCompletion(UnitOfWorkImpl.java:3135)
    at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.issueSQLbeforeCompletion(RepeatableWriteUnitOfWork.java:344)
    at org.eclipse.persistence.transaction.AbstractSynchronizationListener.beforeCompletion(AbstractSynchronizationListener.java:157)
    at org.eclipse.persistence.transaction.JTASynchronizationListener.beforeCompletion(JTASynchronizationListener.java:68)
    at com.sun.enterprise.transaction.JavaEETransactionImpl.commit(JavaEETransactionImpl.java:435)
    at com.sun.enterprise.transaction.JavaEETransactionManagerSimplified.commit(JavaEETransactionManagerSimplified.java:852)
    at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5114)
    at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4879)
    at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2039)
    at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1990)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:222)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
    at $Proxy302.create(Unknown Source)
    at sessionBeans.__EJB31_Generated__ClasseHasEtudiantFacade__Intf____Bean__.create(Unknown Source)
    at managedBeans.ClasseHasEtudiantController.create(ClasseHasEtudiantController.java:86)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:234)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
    at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:43)
    at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:56)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
    at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:722)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`isetdb`.`classe_has_etudiant`, CONSTRAINT `classe_has_etudiant_ibfk_1` FOREIGN KEY (`Classe_id`) REFERENCES `classe` (`id`) ON DELETE CASCADE ON UPDATE CASCADE)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
    at com.mysql.jdbc.Util.getInstance(Util.java:384)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1041)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3566)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3498)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1959)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2113)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2568)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2113)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2409)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2327)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2312)
    at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:831)
    ... 87 more

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1 Answer

Editorial Team · Answer 1 · 2026-06-05T07:13:55+00:00

Your database schema suggest that Classe_id is a foreign key.

But while saving class you are assigning a new Primary key which basically sets classeid and etudiantid to zero, and while saving record there are no records with matching id.

Current Implementation:

current.setClasseHasEtudiantPK(new dossierEtudiants.entities.ClasseHasEtudiantPK());

Instead you should set the id of Class and id of Student between which you are doing the mapping.

Looking from the xhtml I think in your managed bean you would be having something like

selected.classe which holds the selected class and selected.etudiant which holds the selected, so your code should look something like this:

ClasseHasEtudiantPK classeHasEtudiantPK = new dossierEtudiants.entities.ClasseHasEtudiantPK(selected.classe.classeid, selected.etudiant.etudiantid);
//Note depending upon your code the above two values selected.classe.classeid and selected.etudiant.etudinatid may change, so set according to your code.
current.setClasseHasEtudiantPK(classeHasEtudiantPK);

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