Link one to many and combobox

[mkuzmik]

Hello
I have the next beans

`
/**
* Titre : ADPclearing java packages
* Description : Java packages for ADPclearing web based products
* Copyright : Copyright (c) 2003-2007
*/
package com.adpclr.ejb.entity.traduct;

import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

import com.adpclr.ejb.entity.admin.Language;

/**
* @author Maxim Kuzmik
* Date of Create: 14.05.2009
* @version 1.0
*
*/

@Entity
@Table(name = "traduct.menu_t")
public class Menu_t implements Serializable{
private static final long serialVersionUID = "com.adpclr.ejb.entity.traduct.Menu_t".hashCode();

private String code;
private String traduct;
private Language language;

/**
* @param code The code to set.
*/
public void setCode(String code){
this.code = code;
}

/**
* @return Returns the code.
*/
@Id
public String getCode(){
return code;
}

/**
* @param traduct The traduct to set.
*/
public void setTraduct(String traduct){
this.traduct = traduct;
}

/**
* @return Returns the traduct.
*/
public String getTraduct(){
return traduct;
}

@ManyToOne
@JoinColumn(name = "languageid")
public Language getLanguage(){
return language;
}

public void setLanguage(Language language){
this.language = language;
}

}`

and

`/**
* Titre : ADPclearing java packages
* Description : Java packages for ADPclearing web based products
* Copyright : Copyright (c) 2003-2007
*/
package com.adpclr.ejb.entity.admin;

import java.io.Serializable;
import java.util.Set;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;

import com.adpclr.ejb.entity.traduct.Menu_t;

/**
* @author Maxim Kuzmik
* Date of Create: 19.05.2009
* @version 1.0
*
*/

@Entity
@Table(name = "admin.language")
public class Language implements Serializable{
private static final long serialVersionUID = "com.adpclr.ejb.entity.admin.Language".hashCode();

private Integer languageid;
private String languagecode;
private Set<Menu_t> menuTraductList;

/**
* @param languageid The languageid to set.
*/
public void setLanguageid(Integer languageid){
this.languageid = languageid;
}

/**
* @return Returns the languageid.
*/
@Id
public Integer getLanguageid(){
return languageid;
}

/**
* @param languagecode The languagecode to set.
*/
public void setLanguagecode(String languagecode){
this.languagecode = languagecode;
}

/**
* @return Returns the languagecode.
*/
public String getLanguagecode(){
return languagecode;
}

@OneToMany(mappedBy = "language", fetch = FetchType.LAZY)
public Set<Menu_t> getMenuTraductList(){
return menuTraductList;
}

public void setMenuTraductList(Set<Menu_t> menuTraductList){
this.menuTraductList = menuTraductList;
}

public String toString(){
return languagecode;
}

}`


and have Session Bean.
`
/**
* Titre : ADPclearing java packages
* Description : Java packages for ADPclearing web based products
* Copyright : Copyright (c) 2003-2007
*/
package com.adpclr.ejb.session.tables;

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

import javax.ejb.Remove;
import javax.ejb.Stateful;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.faces.FacesMessages;

import com.adpclr.ejb.entity.admin.Language;
import com.adpclr.ejb.entity.traduct.Menu_t;
import com.adpclr.ejb.session.tables.local.Menu_tManager;

/**
* @author Maxim Kuzmik
* Date of Create: 15.05.2009
* @version 1.0
*
*/

@Stateful
@Name("tablemanager_traduct_menu_t")
@Scope(ScopeType.SESSION)
public class Menu_tManagerBean implements Serializable, Menu_tManager{
private static final long serialVersionUID = "com.adpclr.ejb.session.tables.Menu_tManagerBean".hashCode();

@PersistenceContext(type = javax.persistence.PersistenceContextType.EXTENDED)
private EntityManager em;

@In
private FacesMessages facesMessages;

private List<Menu_t> records;

private List languages;

private Menu_t currentRow;

public void select(){
}

public void delete(){
records.remove(currentRow);
em.remove(currentRow);
currentRow = null;
}

@Remove
public void destroy(){
}

public void save(){
em.merge(currentRow);
currentRow = null;
}

/**
* @param records The records to set.
*/
public void setRecords(List<Menu_t> records){
this.records = records;
}

/**
* @return Returns the records.
*/
@SuppressWarnings("unchecked")
public List<Menu_t> getRecords(){
records = em.createQuery("select tbl from Menu_t tbl").getResultList();
return records;
}

/**
* @param currentRow The currentRow to set.
*/
public void setCurrentRow(Menu_t currentRow){
this.currentRow = currentRow;
}

/**
* @return Returns the currentRow.
*/
public Menu_t getCurrentRow(){
return currentRow;
}

/**
* @param languages The languages to set.
*/
public void setLanguages(List languages){
this.languages = languages;
}

/**
* @return Returns the languages.
*/
@SuppressWarnings("unchecked")
public List getLanguages(){
languages = em.createQuery("select tbl from Language tbl").getResultList();
return languages;
}

}`


and have next JSP.

` <h:form>
<rich:messages style="color:red;"></rich:messages>
<h:panelGrid columns="1">
<a4j:outputPanel ajaxRendered="true">
<h:panelGrid columns="2">
<h:outputText value="Code"/>
<h:inputText value="#{tablemanager_traduct_menu_t.currentRow.code}" id="code" required="true"/>
<h:outputText value="Language" />
<rich:comboBox suggestionValues="#{tablemanager_traduct_menu_t.languages}" directInputSuggestions="true" value="#{tablemanager_traduct_menu_t.currentRow.language}"/>
<h:outputText value="Traduct" />
<h:inputText value="#{tablemanager_traduct_menu_t.currentRow.traduct}" id="traduct" required="true"/>
</h:panelGrid>
</a4j:outputPanel>
<a4j:commandButton value="#{messages['buttons.save']}"
action="#{tablemanager_traduct_menu_t.save}"
reRender="recordsTable"
oncomplete="if (#{facesContext.maximumSeverity==null}) #{rich:component('editPanel')}.hide();" />
<a4j:commandButton value="#{messages['buttons.cancel']}" onclick="#{rich:component('editPanel')}.hide();return false;" />

</h:panelGrid>
</h:form>
`

And then i click Save button a have got the next error. "value could not be converted to the expected type". I think that problem is in Language field. Bu i don't know how to fix it =(

[ilya_shaikovsky]

suggestionValues should be list of Strings or you should define proper converter for your Objects.

[mkuzmik]

Hm, can you write the example how can i do this? It's nessasary that after change the value in combobox succefull change the value in tablemanager_traduct_menu_t.currentRow.language this is Language class instance.