小贝子编程

在JSF中使用SelectOneMenu创建转换器



我无法从SelectOneMenu中获得选中的项目。我向菜单提供了一个Set，并希望用户从中选择一个。我将菜单放入一个表单中，因此我有一个commandButton，我打算使用它来执行选择。这个实现给出了这个错误:java.util。LinkedHashSet不能被强制转换为com.gestion. project .domain. project我想得到一个项目对象，而不是项目的列表下面是我的trace:

mai 18, 2014 1:06:54 PM com.sun.faces.lifecycle.ProcessValidationsPhase execute
Avertissement: java.util.LinkedHashSet cannot be cast to com.gestion.projet.domain.Projet
java.lang.ClassCastException: java.util.LinkedHashSet cannot be cast to com.gestion.projet.domain.Projet
    at com.gestion.projet.dao.ProjetDAOImpl.findProjetByNom(ProjetDAOImpl.java:124)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    at $Proxy42.findProjetByNom(Unknown Source)
    at com.gestion.projet.web.jsf.PhaseComponentImpl.getAsObject(PhaseComponentImpl.java:298)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196)
    at $Proxy56.getAsObject(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
    at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    at $Proxy9.getAsObject(Unknown Source)
    at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:167)
    at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectOneValue(MenuRenderer.java:198)
    at com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:315)
    at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1023)
    at javax.faces.component.UIInput.validate(UIInput.java:953)
    at javax.faces.component.UIInput.executeValidate(UIInput.java:1204)
    at javax.faces.component.UIInput.processValidators(UIInput.java:693)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081)
    at org.primefaces.component.panel.Panel.processValidators(Panel.java:281)
    at javax.faces.component.UIForm.processValidators(UIForm.java:240)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081)
    at org.primefaces.component.layout.Layout.processValidators(Layout.java:233)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081)
    at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1159)
    at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:72)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:113)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
mai 18, 2014 1:06:54 PM org.apache.catalina.core.StandardWrapperValve invoke
Grave: Servlet.service() for servlet [Faces Servlet] in context with path [/HCP] threw exception [java.util.LinkedHashSet cannot be cast to com.gestion.projet.domain.Projet] with root cause
java.lang.ClassCastException: java.util.LinkedHashSet cannot be cast to com.gestion.projet.domain.Projet
    at com.gestion.projet.dao.ProjetDAOImpl.findProjetByNom(ProjetDAOImpl.java:124)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    at $Proxy42.findProjetByNom(Unknown Source)
    at com.gestion.projet.web.jsf.PhaseComponentImpl.getAsObject(PhaseComponentImpl.java:298)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196)
    at $Proxy56.getAsObject(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
    at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    at $Proxy9.getAsObject(Unknown Source)
    at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:167)
    at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectOneValue(MenuRenderer.java:198)
    at com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:315)
    at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1023)
    at javax.faces.component.UIInput.validate(UIInput.java:953)
    at javax.faces.component.UIInput.executeValidate(UIInput.java:1204)
    at javax.faces.component.UIInput.processValidators(UIInput.java:693)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081)
    at org.primefaces.component.panel.Panel.processValidators(Panel.java:281)
    at javax.faces.component.UIForm.processValidators(UIForm.java:240)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081)
    at org.primefaces.component.layout.Layout.processValidators(Layout.java:233)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081)
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1081)
    at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1159)
    at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:72)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:113)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
下面是生成selectOneMenu的xhtml部分: 
<h:selectOneMenu id="selectProjet" value="#{PhaseComponent.projet}" required="true" converter="#{PhaseComponent}">
                                    <f:selectItem itemLabel="Select One" itemValue=""  />
                                    <f:selectItems value="#{PhaseComponent.findNomProjets()}" var="projet" itemValue="#{projet}" itemLabel="#{ProjetComponent.projet.nomprojet}" />

                              </h:selectOneMenu>

这个是转换器类

@Transactional
public Projet findProjetByName(String nomprojet)
{
    return (Projet)(projetDAO.findProjetByNom(nomprojet));
}
public Object getAsObject(FacesContext arg0, UIComponent arg1, String arg2) {
    projet=(Projet) projetDAO.findProjetByNom(arg2);
    return projet ;
}
当我添加转换器时，我得到了这个错误这是PhaseComponent类: 
@Scope("session")
@Component("PhaseComponent")
public class PhaseComponentImpl implements PhaseComponent ,Converter {
    private Phase phase;
    private Projet projet;
    private Tache taches;
    private Livrable livrables;
    @Autowired
    private LivrableDAO livrableDAO;
    @Autowired
    private PhaseDAO phaseDAO;
    @Autowired
    private ProjetDAO projetDAO;
    @Autowired
    private TacheDAO tacheDAO;
    @Autowired
    private PhaseService phaseService;
    private Set<SelectItem> selected;
    /** 
     */

    /** 
     */
    public Set<SelectItem> getSelectOneItemsProj(){
        this.selected= new LinkedHashSet<SelectItem>();
        Set<Projet> projets=projetDAO.findAllProjets();
        for(Projet proj:projets)
        {
            SelectItem selectItem=new SelectItem(proj.getIdprojet(),proj.getNomprojet());
            this.selected.add(selectItem);      }
        return selected;
    }
    public PhaseComponentImpl() {
    }
    @Transactional
    public String selectPhaseTaches(Integer phase_idphase, Integer related_taches_idtache) {
        taches = tacheDAO.findTacheByPrimaryKey(related_taches_idtache, -1, -1);
        return "/jsf/phase/taches/viewTaches.xhtml";
    }
    @Transactional
    public String editPhaseLivrables(Integer phase_idphase, Integer related_livrables_idlivrable) {
        livrables = livrableDAO.findLivrableByPrimaryKey(related_livrables_idlivrable, -1, -1);
        return "/jsf/phase/livrables/editLivrables.xhtml";
    }
    @Transactional
    public String newPhaseTaches(Integer phase_idphase) {
        taches = new Tache();
        return "/jsf/phase/taches/createTaches.xhtml";
    }
    @Transactional
    public Tache getTaches() {
        return taches;
    }

    @Transactional
    public String savePhaseProjet(Integer phase_idphase, Projet projet) {
        phase = phaseService.savePhaseProjet(phase_idphase, projet);
        return "/jsf/phase/viewPhase.xhtml";
    }
    @Transactional
    public Projet getPhaseProjet(Integer idphaseKey) {
        return phaseDAO.findPhaseByPrimaryKey(idphaseKey).getProjet();
    }
    @Transactional
    public Projet getProjet() {
        return projet;
    }

    @Transactional
    public String confirmDeletePhaseProjet(Integer phase_idphase, Integer related_projet_idprojet) {
        projet = projetDAO.findProjetByPrimaryKey(related_projet_idprojet);
        return "/jsf/phase/projet/deleteProjet.xhtml";
    }
    @Transactional
    public String newPhaseLivrables(Integer phase_idphase) {
        livrables = new Livrable();
        return "/jsf/phase/livrables/createLivrables.xhtml";
    }

    @Transactional
    public String confirmDeletePhaseTaches(Integer phase_idphase, Integer related_taches_idtache) {
        taches = tacheDAO.findTacheByPrimaryKey(related_taches_idtache);
        return "/jsf/phase/taches/deleteTaches.xhtml";
    }
    @Transactional
    public List<Livrable> listPhaseLivrables(Integer idphaseKey) {
        return new java.util.ArrayList<Livrable>(phaseDAO.findPhaseByPrimaryKey(idphaseKey).getLivrables());
    }
    @Transactional
    public String deletePhaseProjet(Integer phase_idphase, Integer related_projet_idprojet) {
        phase = phaseService.deletePhaseProjet(phase_idphase, related_projet_idprojet);
        return "/jsf/phase/viewPhase.xhtml";
    }
    @Transactional
    public String confirmDeletePhaseLivrables(Integer phase_idphase, Integer related_livrables_idlivrable) {
        livrables = livrableDAO.findLivrableByPrimaryKey(related_livrables_idlivrable);
        return "/jsf/phase/livrables/deleteLivrables.xhtml";
    }
    @Transactional
    public List<Phase> listPhases() {
        return new java.util.ArrayList<Phase>(phaseService.loadPhases());
    }

    @Transactional
    public String savePhaseTaches(Integer phase_idphase, Tache tache) {
        phase = phaseService.savePhaseTaches(phase_idphase, tache);
        return "/jsf/phase/viewPhase.xhtml";
    }
    @Transactional
    public Livrable getLivrables() {
        return livrables;
    }
    @Transactional
    public String savePhaseLivrables(Integer phase_idphase, Livrable livrable) {
        phase = phaseService.savePhaseLivrables(phase_idphase, livrable);
        return "/jsf/phase/viewPhase.xhtml";
    }
    @Transactional
    public String editPhase(Integer idphaseKey) {
        phase = phaseDAO.findPhaseByPrimaryKey(idphaseKey);
        return "/jsf/phase/editPhase.xhtml";
    }

    @Transactional
    public String editPhaseProjet(Integer phase_idphase, Integer related_projet_idprojet) {
        projet = projetDAO.findProjetByPrimaryKey(related_projet_idprojet, -1, -1);
        return "/jsf/phase/projet/editProjet.xhtml";
    }

    @Transactional
    public String selectPhaseLivrables(Integer phase_idphase, Integer related_livrables_idlivrable) {
        livrables = livrableDAO.findLivrableByPrimaryKey(related_livrables_idlivrable, -1, -1);
        return "/jsf/phase/livrables/viewLivrables.xhtml";
    }
    @Transactional
    public String savePhase(Phase phase) {
        phaseService.savePhase(phase);
        return "/jsf/phase/listPhases.xhtml";
    }
    @Transactional
    public String confirmDeletePhase(Integer idphaseKey) {
        phase = phaseDAO.findPhaseByPrimaryKey(idphaseKey);
        return "/jsf/phase/deletePhase.xhtml";
    }

    @Transactional
    public String editPhaseTaches(Integer phase_idphase, Integer related_taches_idtache) {
        taches = tacheDAO.findTacheByPrimaryKey(related_taches_idtache, -1, -1);
        return "/jsf/phase/taches/editTaches.xhtml";
    }

    @Transactional
    public String selectPhase(Integer idphaseKey) {
        phase = phaseDAO.findPhaseByPrimaryKey(idphaseKey);
        return "/jsf/phase/viewPhase.xhtml";
    }

    @Transactional
    public String selectPhaseProjet(Integer phase_idphase, Integer related_projet_idprojet) {
        projet = projetDAO.findProjetByPrimaryKey(related_projet_idprojet, -1, -1);
        return "/jsf/phase/projet/viewProjet.xhtml";
    }

    @Transactional
    public Phase getPhase() {
        return phase;
    }
    @Transactional
    public String newPhaseProjet(Integer phase_idphase) {
        projet = new Projet();
        return "/jsf/phase/projet/createProjet.xhtml";
    }

    @Transactional
    public String deletePhaseLivrables(Integer phase_idphase, Integer related_livrables_idlivrable) {
        phase = phaseService.deletePhaseLivrables(phase_idphase, related_livrables_idlivrable);
        return "/jsf/phase/viewPhase.xhtml";
    }

    @Transactional
    public List<Tache> listPhaseTaches(Integer idphaseKey) {
        return new java.util.ArrayList<Tache>(phaseDAO.findPhaseByPrimaryKey(idphaseKey).getTaches());
    }

    @Transactional
    public String deletePhase(Integer idphaseKey) {
        Phase phase = phaseDAO.findPhaseByPrimaryKey(idphaseKey);
        phaseService.deletePhase(phase);
        return "/jsf/phase/listPhases.xhtml";
    }

    @Transactional
    public String newPhase() {
        phase = new Phase();
        return "/jsf/phase/createPhase.xhtml";
    }

    @Transactional
    public String deletePhaseTaches(Integer phase_idphase, Integer related_taches_idtache) {
        phase = phaseService.deletePhaseTaches(phase_idphase, related_taches_idtache);
        return "/jsf/phase/viewPhase.xhtml";
    }
    @Transactional
    public void affectPhaseProjet(Integer phase_idphase_3,
            Integer phase_idprojet) {
        projet = projetDAO.findProjetByPrimaryKey(phase_idprojet, -1, -1);
        phase.setProjet(projet);
    }
    @Transactional
    public Projet findNomProjet()
    {
        return (Projet) projetDAO.findNomProjets();
    }
    public Object getAsObject(FacesContext arg0, UIComponent arg1, String arg2) {
        projet=(Projet) projetDAO.findProjetByNomprojet(arg2);
        return projet ;
    }
    public String getAsString(FacesContext arg0, UIComponent arg1, Object arg2) {
        // TODO Auto-generated method stub
        return null;
    }
    public List<Projet> findNomProjets() {
        // TODO Auto-generated method stub
        return projetDAO.findNomProjets();
    }
}

这是我的XHTML使用了这个类也使用了转换器

<h:panelGrid id="detail" columns="2" styleClass="grid" columnClasses="label,value">
                        <h:outputText value="#{phasemsgs['phase.datedebut.title']}:" />
                    <p:calendar value="#{PhaseComponent.phase.datedebut}" id="datedebut"  converter="dateConverterForCalendar"/>
                    <h:outputText value="#{phasemsgs['projet.datefineffective.title']}:" />
                            <p:calendar value="#{PhaseComponent.phase.datefin}" id="datefin"  converter="dateConverterForCalendar"/>
                        <h:outputText value="#{phasemsgs['phase.description.title']}:" />
                            <h:inputText id="phase_description" value="#{PhaseComponent.phase.description}" required="false" label="phase_description" />
                         <h:outputLabel  value="Projet: *" />
                             <h:selectOneMenu id="selectProjet" value="#{PhaseComponent.projet}" required="true" converter="#{entityConverter}">
                                    <f:selectItem itemLabel="Select One" itemValue=""  />
                                    <f:selectItems value="#{PhaseComponent.findNomProjets()}" />
                              </h:selectOneMenu>
                    <h:panelGroup>
                        <p:commandButton image="save" ajax="false" style="margin-right:20px;" value="#{phasemsgs['navigation.save']}" action="#{PhaseComponent.savePhase(PhaseComponent.phase)}"/>
                    </h:panelGroup>
                </h:panelGrid>

您不需要创建自己的converter。

如果你想要一个generic converter，那么Omnifaces SelectItemsConverter是最好的。

Omni Faces Converter

如果你不想使用Omnifaces，那么使用下面的通用转换器

import java.util.Map;
import java.util.Map.Entry;
import java.util.UUID;
import java.util.WeakHashMap;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.FacesConverter;
@FacesConverter(value = "entityConverter")
public class EntityConverter implements Converter {
    private static Map<Object, String> entities = new WeakHashMap<Object, String>();
    @Override
    public String getAsString(FacesContext context, UIComponent component, Object entity) {
        synchronized (entities) {
            if (!entities.containsKey(entity)) {
                String uuid = UUID.randomUUID().toString();
                entities.put(entity, uuid);
                return uuid;
            } else {
                return entities.get(entity);
            }
        }
    }
    @Override
    public Object getAsObject(FacesContext context, UIComponent component, String uuid) {
        for (Entry<Object, String> entry : entities.entrySet()) {
            if (entry.getValue().equals(uuid)) {
                return entry.getKey();
            }
        }
        return null;
    }
}

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