如果启用 ajax，PrimeFaces commandButton 不会调用操作答案

【问题标题】：PrimeFaces commandButton doesn't call action if ajax enabled如果启用 ajax，PrimeFaces commandButton 不会调用操作
【发布时间】：2011-10-01 07:48:43
【问题描述】：

这是我的页面：

<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:cpanel="http://java.sun.com/jsf/composite/components/cpanel"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:p="http://primefaces.prime.com.tr/ui"
      xmlns:ui="http://java.sun.com/jsf/facelets">
    <h:head>
        <title></title>
    </h:head>
    <h:body>
        <ui:composition template="/WEB-INF/templates/cpanelLayout.xhtml">
            <ui:define name="metadata">
                <f:metadata>
                    <f:viewParam name="id" value="#{linkDoctorBean.incomingDoctorId}" required="true"/>
                    <f:event type="preRenderView" listener="#{linkDoctorBean.preRenderView}"/>
                </f:metadata>
            </ui:define>
            <ui:define name="cpanelContent">
                <cpanel:adddedClinicDoctor doctor="#{linkDoctorBean.incomingDoctor}" clinic="#{linkDoctorBean.clinic}"/>
                <h:form id="form">
                    <div>
                        <h:panelGrid columns="2">
                            <p:selectOneMenu id="doctor"
                                             value="#{linkDoctorBean.doctor}"
                                             converter="#{doctorConverter}"
                                             effect="fade"
                                             var="d"
                                             height="180"
                                             validator="#{linkDoctorBean.validateDoctor}">
                                <f:selectItem itemLabel="Select a doctor" itemValue="" noSelectionOption="true"/>
                                <f:selectItems value="#{linkDoctorBean.doctors}" var="doctor" itemLabel="#{stringBean.doctorToString(doctor)}" itemValue="#{doctor}"/>
                                <p:column>
                                    <p:graphicImage value="#{applicationBean.baseResourceUrl}/doc-photo/small/#{d.urlDisplayName}"/>
                                </p:column>
                                <p:column>
                                    #{stringBean.doctorToString(d)}
                                </p:column>
                            </p:selectOneMenu>
                            <p:message id="doctorMessage" for="doctor"/>
                        </h:panelGrid>
                    </div>
                    <div style="margin-top:20px;">
                        <p:commandButton value="Link" action="#{linkDoctorBean.submit()}" update="doctorMessage" process="@all"/>
                        <h:link value="Cancel" outcome="/pages/cpanel/manage-doctors" style="margin-left:10px;"/>
                    </div>
                </h:form>
            </ui:define>
        </ui:composition>
    </h:body>
</html>

当我将ajax="false" 添加到<p:commandButton/> 时，它工作得很好——调用了linkDoctorBean.submit() 方法。

然而，启用ajax，如果表单在当前视图中从未失败验证，则将调用action方法，但如果表单验证失败一次并随后提交，则错误消息被清除，但submit()方法永远不会被调用。

编辑： 我也试过用这个替换p:commandButton：

<h:commandButton value="Link" action="#{linkDoctorBean.submit()}">
    <f:ajax execute="@all" render="doctorMessage"/>
</h:commandButton>

行为完全相同。在这两种情况下，当提交有效选项时，验证消息似乎已被清除。所以更新/渲染正在发生，而不是进程/执行。所有后续尝试都无法执行该操作，因此该表单实际上是无效的，直到下次加载页面。

编辑： 这似乎不是 PrimeFaces 问题。这是没有 PrimeFaces 的表单：

    <h:form id="form">
        <div>
            <h:panelGrid columns="2">
                <h:selectOneMenu id="doctor"
                                 value="#{linkDoctorBean.doctor}"
                                 converter="#{doctorConverter}"
                                 style="width:200px;"
                                 required="true"
                                 requiredMessage="Please select a doctor"
                                 validator="#{linkDoctorBean.validateDoctor}">
                    <f:selectItem itemLabel="Select a doctor" itemValue="#{null}" noSelectionOption="true"/>
                    <f:selectItems value="#{linkDoctorBean.doctors}" var="doctor" itemLabel="#{stringBean.doctorToString(doctor)}" itemValue="#{doctor}"/>
                </h:selectOneMenu>
                <h:message id="doctorMessage" for="doctor"/>
            </h:panelGrid>
        </div>
        <div style="margin-top:20px;">
            <h:commandButton value="Link" action="#{linkDoctorBean.submit()}">
                <f:ajax execute="@form" render="doctorMessage"/>
            </h:commandButton>
            <h:link value="Cancel" outcome="/pages/cpanel/manage-doctors" style="margin-left:10px;"/>
        </div>
    </h:form>

现在有一些细微差别，例如required 和占位符选择项的值是null。也许最好专注于这个最新的 sn-p 可能出了什么问题，暂时忘记 PrimeFaces。

如果有帮助，这里是 DoctorConverter 类：

@Named("doctorConverter")
@RequestScoped
public class DoctorConverter implements Converter, Serializable
{
    @Override
    public Object getAsObject(FacesContext context, UIComponent component, String value)
    {
        UIInput in = (UIInput) component;
        String s = in.getSubmittedValue() != null ? in.getSubmittedValue().toString() : "";

        try
        {
            long doctorId = Long.parseLong(s);
            Doctor doctor = doctorDao.findByDoctorId(doctorId);
            if (doctor == null)
            {
                throw new Exception("Doctor not found.");
            }
            return doctor;
        }
        catch (Exception e)
        {
            throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "Please enter a valid doctor", null), e);
        }
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component, Object value)
    {
        if (value == null || value.toString().length() == 0)
        {
            return "";
        }
        Doctor doctor = (Doctor) value;
        return doctor.getDoctorId().toString();
    }

    @EJB
    private DoctorDao doctorDao;
}

编辑： ... 下面是来自Doctor 实体类的几个方法：

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

@Override
public boolean equals(Object object)
{
    if (!(object instanceof Doctor))
    {
        return false;
    }
    Doctor other = (Doctor) object;
    if ((this.doctorId == null && other.doctorId != null) || (this.doctorId != null && !this.doctorId.equals(other.doctorId)))
    {
        return false;
    }
    return true;
}

编辑： 正如 cmets 中所讨论的，DoctorConverter.getAsObject 被调用了 3 次。以下是三个调用的堆栈跟踪：

at java.lang.Thread.dumpStack(Thread.java:1342)
at com.localgp.jsf.converter.DoctorConverter.getAsObject(DoctorConverter.java:34)
at com.localgp.jsf.converter.org$jboss$weld$bean-localgp-server-web-1$0-SNAPSHOT_war-ManagedBean-class_com$localgp$jsf$converter$DoctorConverter_$$_WeldClientProxy.getAsObject(org$jboss$weld$bean-localgp-server-web-1$0-SNAPSHOT_war-ManagedBean-class_com$localgp$jsf$converter$DoctorConverter_$$_WeldClientProxy.java)
at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:171)
at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectOneValue(MenuRenderer.java:202)
at com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:319)
at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1030)
at javax.faces.component.UIInput.validate(UIInput.java:960)
at javax.faces.component.UIInput.executeValidate(UIInput.java:1233)
at javax.faces.component.UIInput.processValidators(UIInput.java:698)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIForm.processValidators(UIForm.java:253)
at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:508)
at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1589)
at javax.faces.component.UIForm.visitTree(UIForm.java:344)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)
at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:376)
at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:252)
at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:183)
at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1170)
at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)
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.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at com.localgp.NoCacheFilter.doFilter(NoCacheFilter.java:36)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:785)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:649)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:483)
at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:454)
at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:350)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:300)
at org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:213)
at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:171)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:381)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.__invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java)
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.comet.CometEngine.executeServlet(CometEngine.java:444)
at com.sun.grizzly.comet.CometEngine.handle(CometEngine.java:308)
at com.sun.grizzly.comet.CometAsyncFilter.doFilter(CometAsyncFilter.java:87)
at com.sun.grizzly.arp.DefaultAsyncExecutor.invokeFilters(DefaultAsyncExecutor.java:171)
at com.sun.grizzly.arp.DefaultAsyncExecutor.interrupt(DefaultAsyncExecutor.java:143)
at com.sun.grizzly.arp.AsyncProcessorTask.doTask(AsyncProcessorTask.java:94)
at com.sun.grizzly.http.TaskBase.run(TaskBase.java:193)
at com.sun.grizzly.http.TaskBase.execute(TaskBase.java:175)
at com.sun.grizzly.arp.DefaultAsyncHandler.handle(DefaultAsyncHandler.java:145)
at com.sun.grizzly.arp.AsyncProtocolFilter.execute(AsyncProtocolFilter.java:204)
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)

at java.lang.Thread.dumpStack(Thread.java:1342)
at com.localgp.jsf.converter.DoctorConverter.getAsObject(DoctorConverter.java:34)
at com.localgp.jsf.converter.org$jboss$weld$bean-localgp-server-web-1$0-SNAPSHOT_war-ManagedBean-class_com$localgp$jsf$converter$DoctorConverter_$$_WeldClientProxy.getAsObject(org$jboss$weld$bean-localgp-server-web-1$0-SNAPSHOT_war-ManagedBean-class_com$localgp$jsf$converter$DoctorConverter_$$_WeldClientProxy.java)
at javax.faces.component.SelectUtils.doConversion(SelectUtils.java:191)
at javax.faces.component.SelectUtils.matchValue(SelectUtils.java:99)
at javax.faces.component.UISelectOne.validateValue(UISelectOne.java:153)
at javax.faces.component.UIInput.validate(UIInput.java:967)
at javax.faces.component.UIInput.executeValidate(UIInput.java:1233)
at javax.faces.component.UIInput.processValidators(UIInput.java:698)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIForm.processValidators(UIForm.java:253)
at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:508)
at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1589)
at javax.faces.component.UIForm.visitTree(UIForm.java:344)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)
at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:376)
at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:252)
at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:183)
at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1170)
at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)
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.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at com.localgp.NoCacheFilter.doFilter(NoCacheFilter.java:36)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:785)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:649)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:483)
at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:454)
at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:350)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:300)
at org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:213)
at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:171)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:381)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.__invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java)
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.comet.CometEngine.executeServlet(CometEngine.java:444)
at com.sun.grizzly.comet.CometEngine.handle(CometEngine.java:308)
at com.sun.grizzly.comet.CometAsyncFilter.doFilter(CometAsyncFilter.java:87)
at com.sun.grizzly.arp.DefaultAsyncExecutor.invokeFilters(DefaultAsyncExecutor.java:171)
at com.sun.grizzly.arp.DefaultAsyncExecutor.interrupt(DefaultAsyncExecutor.java:143)
at com.sun.grizzly.arp.AsyncProcessorTask.doTask(AsyncProcessorTask.java:94)
at com.sun.grizzly.http.TaskBase.run(TaskBase.java:193)
at com.sun.grizzly.http.TaskBase.execute(TaskBase.java:175)
at com.sun.grizzly.arp.DefaultAsyncHandler.handle(DefaultAsyncHandler.java:145)
at com.sun.grizzly.arp.AsyncProtocolFilter.execute(AsyncProtocolFilter.java:204)
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)

at java.lang.Thread.dumpStack(Thread.java:1342)
at com.localgp.jsf.converter.DoctorConverter.getAsObject(DoctorConverter.java:34)
at com.localgp.jsf.converter.org$jboss$weld$bean-localgp-server-web-1$0-SNAPSHOT_war-ManagedBean-class_com$localgp$jsf$converter$DoctorConverter_$$_WeldClientProxy.getAsObject(org$jboss$weld$bean-localgp-server-web-1$0-SNAPSHOT_war-ManagedBean-class_com$localgp$jsf$converter$DoctorConverter_$$_WeldClientProxy.java)
at javax.faces.component.SelectUtils.doConversion(SelectUtils.java:191)
at javax.faces.component.SelectUtils.valueIsNoSelectionOption(SelectUtils.java:150)
at javax.faces.component.UISelectOne.validateValue(UISelectOne.java:159)
at javax.faces.component.UIInput.validate(UIInput.java:967)
at javax.faces.component.UIInput.executeValidate(UIInput.java:1233)
at javax.faces.component.UIInput.processValidators(UIInput.java:698)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIForm.processValidators(UIForm.java:253)
at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:508)
at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1589)
at javax.faces.component.UIForm.visitTree(UIForm.java:344)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)
at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:376)
at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:252)
at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:183)
at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1170)
at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)
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.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at com.localgp.NoCacheFilter.doFilter(NoCacheFilter.java:36)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:785)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:649)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:483)
at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:454)
at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:350)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:300)
at org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:213)
at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:171)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:381)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.__invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java)
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.comet.CometEngine.executeServlet(CometEngine.java:444)
at com.sun.grizzly.comet.CometEngine.handle(CometEngine.java:308)
at com.sun.grizzly.comet.CometAsyncFilter.doFilter(CometAsyncFilter.java:87)
at com.sun.grizzly.arp.DefaultAsyncExecutor.invokeFilters(DefaultAsyncExecutor.java:171)
at com.sun.grizzly.arp.DefaultAsyncExecutor.interrupt(DefaultAsyncExecutor.java:143)
at com.sun.grizzly.arp.AsyncProcessorTask.doTask(AsyncProcessorTask.java:94)
at com.sun.grizzly.http.TaskBase.run(TaskBase.java:193)
at com.sun.grizzly.http.TaskBase.execute(TaskBase.java:175)
at com.sun.grizzly.arp.DefaultAsyncHandler.handle(DefaultAsyncHandler.java:145)
at com.sun.grizzly.arp.AsyncProtocolFilter.execute(AsyncProtocolFilter.java:204)
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)

这是 JSF 页面中的当前表单：

<h:form id="form">
    <!-- Validating here instead of at the selectOneMenu level due to its invalidity not being cleared. -->
    <div style="clear:both;">
        <h:panelGrid columns="2">
            <h:selectOneMenu id="doctor"
                             value="#{linkDoctorBean.doctor}"
                             converter="#{doctorConverter}"
                             converterMessage="Please select a doctor"
                             style="width:200px;"
                             required="true">
                <f:selectItem itemLabel="Select a doctor" itemValue="" noSelectionOption="true"/>
                <f:selectItems value="#{linkDoctorBean.doctors}" var="doctor" itemLabel="#{stringBean.doctorToString(doctor)}" itemValue="#{doctor}"/>
            </h:selectOneMenu>
            <p:message id="doctorMessage" for="doctor"/>
        </h:panelGrid>
    </div>
    <div style="margin-top:20px;">
        <h:commandButton value="Link" action="#{linkDoctorBean.submit()}">
            <f:ajax execute="@form" render="doctorMessage"/>
        </h:commandButton>
        <h:link value="Cancel" outcome="/pages/cpanel/manage-doctors" style="margin-left:10px;"/>
    </div>
</h:form>

编辑： 删除了<f:ajax/>，DoctorConverter.getAsObject 仍然被调用了 3 次。

【问题讨论】：

什么 JSF impl/version 和 PF 版本？试试@form 而不是@all。
谢谢。试过@form，没区别。 Mojarra 2.1.3 (GlassFish 3.1.1)，PrimeFaces 3.0 M3。
@BalusC，请参阅第二次编辑。 PrimeFaces 现在不在了。
我无法重现您的问题。也许validateDoctor() 做错了什么。顺便说一句，在转换器中，您应该从第三个参数String value 中获取提交的值。
@BalusC，我认为您可能对转换器有所了解，所以我尝试使用 value 代替并添加了一些跟踪写入。有趣的是，转换器被调用了三次，而我希望它只被调用一次。在第二次和第三次调用中，value 为空，而component.submittedValue 对于所有调用具有相同的值。请注意，这是 PF，但我假设它与 h:selectOneMenu 的行为相同。不过，我会尝试的。另外，我删除了验证器，因为我意识到 PF（或 JSF）将确保值来自列表，这就是验证器所做的。

标签： java jsf-2 primefaces

【解决方案1】：

你的转换器坏了。它必须根据value 参数转换值，而不是UIInput#getSubmittedValue()。 noSelectionOption 值也通过转换器传递（作为第 3 条跟踪提示）。如果您实际提交的值等于noSelectionOption 值，则该值被视为无效，因此验证错误。

我还建议进行其他小的重写；空字符串应该是空值。

@Override
public String getAsString(FacesContext context, UIComponent component, Object modelValue) {
    if (modelValue == null) {
        return "";
    }

    if (modelValue instanceof Doctor) {
        Long id = ((Doctor) modelValue).getId();
        return (id != null) ? String.valueOf(id) : null;
    } else {
        throw new ConverterException(new FacesMessage(modelValue + " is not a valid Doctor"));
    }
}

@Override
public Object getAsObject(FacesContext context, UIComponent component, String submittedValue) {
    if (submittedValue == null || submittedValue.isEmpty()) {
        return null;
    }

    try {
        Long id = Long.valueOf(submittedValue);
        return doctorService.find(id);
    } catch (NumberFormatException e) {
        throw new ConverterException(new FacesMessage(submittedValue + " is not a valid Doctor ID"));
    }
}

请注意，我的 web.xml 中也有这个：

<context-param>
    <param-name>javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL</param-name>
    <param-value>true</param-value>
</context-param>

更新：根据 cmets，感谢 <h:messages/> 原来需要其他一些东西。最后它变成了一个<f:viewParam required="true">，它在ajax 回发中被重新调用。为了防止这种情况，请改用

<f:viewParam ... required="#{not facesContext.postback}" />

【讨论】：

您是否暗示在转换后执行required 检查？或者f:selectItem 占位符的选择不构成违反required="true" 属性的内容？最重要的是，DoctorConverter.getAsObject 应该如何处理value.toString().length == 0 的情况，即第 2 次和第 3 次调用的情况？
如果需要选择，您应该使用required="true"。 noSelectionOption 仅代表默认选择或不可选择的选项（例如 -------------- 分隔符或其他内容）。至于空字符串检查，当您使用提到的上下文参数时，这是不必要的。否则，确实检查它（顺便说一句，有一个String#isEmpty() 方法）。
啊等一下...添加<h:messages/> 会显示另一条消息：j_idt2: Validation Error: Value is required. 客户端 DOM 中没有 j_idt2，所以我必须深入挖掘。可能不得不让 faces servlet 退出生产模式，这意味着再见 JRebel。
你不会相信：这是没有为 ajax 调用设置的怪异视图参数。当然，它是按要求标记的。错误在这里：http://java.net/jira/browse/JAVASERVERFACES-1532
天啊。改为required="#{!facesContext.postback}"，如果它是一个viewscoped bean。我没有在我的环境中使用视图参数，因此我从来没有打过它。相关：jdevelopment.nl/stateless-stateful-jsf-view-parameters

【解决方案2】：

以下内容：

converter="#{doctorConverter}"

必须写成：

converter="doctorConverter"

【讨论】：

错了。在使用 CDI 时，以这种方式引用 @javax.inject.Named 带注释的转换器是完全有效的。请参阅DoctorConverter 的定义。自己试试吧。