接缝奇怪的参数错误

Question

我有一个Seam Web应用程序，对于一个页面，我有一个硬编码参数，例如：

docCodesFrom=ClinicContactsView

在DocCodesEdit.page.xml中，我声明它很简单，例如：

<param name="docCodesFrom"/>

问题是，在加载DocCodesEdit.xhtml页面之后，当我按下取消按钮（重定向回之前的页面）时，我收到一个非常奇怪的错误：

由java.lang.ClassCastException引起 消息：“java.lang.String 不能 被投射到 javax.faces.validator.Validator"

所以它抱怨这个 docCodesFrom 参数......

传播到我按取消的页面的链接是：

<s:link view="/#{empty from ? 'DocCodes' : from}View.xhtml"
       value="#{empty from ? 'View' : 'Select'}"
       propagation="#{empty from ? 'none' : 'default'}"
       id="docCodesViewId">
       <f:param name="docCodesId"
            value="#{_docCodes.id}"/>
       <f:param name="docCodesFrom" value="ClinicContactsView"/>
 </s:link>

我花了三个小时在这上面，无法找出原因......

做你看到这个问题了吗？

这里没有 Seam 开发人员？:(

更新：

ClinicContactsView.xhtml 的源代码（用户转到 DocCodesEdit.xhtml 的页面；这里我附加了 docCodesFrom 参数。

 <!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
                xmlns:s="http://jboss.com/products/seam/taglib"
                xmlns:ui="http://java.sun.com/jsf/facelets"
                xmlns:f="http://java.sun.com/jsf/core"
                xmlns:h="http://java.sun.com/jsf/html"
                xmlns:rich="http://richfaces.org/rich"
                xmlns:a4j="http://richfaces.org/a4j"
                template="layout/template.xhtml">

<ui:define name="body">
    <h:form id="contactDetailsSearch">
        <rich:panel style="width:650px">
            <f:facet name="header">View Clinic Details</f:facet>


            <!--Clinic Contact's View-->

            <div style="widht:350px; float:left;">
                <div>
                    <s:decorate id="clinicName" template="/layout/display.xhtml">
                        <ui:define name="label">Clinic Name</ui:define>
                        <h:outputText value="#{clinicContactsHomeFacade.instance.name}">

                        </h:outputText>
                    </s:decorate>
                </div>
                <div>
                    <s:decorate id="address1" template="/layout/display.xhtml">
                        <ui:define name="label">Address</ui:define>
                        <h:outputText value="#{clinicContactsHomeFacade.instance.address1}"/>
                        <h:outputText value="#{clinicContactsHomeFacade.instance.address2}"/>
                    </s:decorate>
                </div>
                <div>
                    <s:decorate id="state" template="/layout/display.xhtml">
                        <ui:define name="label">State</ui:define>
                        <h:outputText value="#{clinicContactsHomeFacade.instance.state}"/>
                    </s:decorate>
                </div>
                <div>
                    <s:decorate id="city" template="/layout/display.xhtml">
                        <ui:define name="label">City</ui:define>
                        <h:outputText value="#{clinicContactsHomeFacade.instance.city}"/>
                    </s:decorate>
                </div>
                <div>
                    <s:decorate id="postalcode" template="/layout/display.xhtml">
                        <ui:define name="label">Postal Code</ui:define>
                        <h:outputText value="#{clinicContactsHomeFacade.instance.postalCode}"/>
                    </s:decorate>
                </div>
                <div>
                    <s:decorate id="country" template="/layout/display.xhtml">
                        <ui:define name="label">Country</ui:define>
                        <h:outputText id="countryEdit" value="#{clinicContactsHomeFacade.instance.country}"/>
                    </s:decorate>
                </div>
            </div>

            <div style="clear:both"/>


            <div class="actionButtonsMiddle">

                <s:button view="/ClinicContactsEdit.xhtml"
                          id="edit"
                          value="Edit"/>

                <s:button view="/#{empty clinicContactsFrom ? 'ClinicContactsList' : clinicContactsFrom}.xhtml"
                          id="done"
                          value="Done"/>
            </div>

            <!--TABS-->
            <rich:spacer height="20"/>
            <rich:tabPanel width="100%">
                <!--Show contact details related to the current clinic-->
                <rich:tab label="Contact Details">

                    <div class="results" id="contactDetailsList">

                        <h:outputText value="The contactDetails search returned no results."
                                      rendered="#{contactDetailsDataModel.rowCount == 0}"/>
                        <rich:dataTable id="contactDetailsTable"
                                        var="_contactDetails"
                                        value="#{contactDetailsDataModel}"
                                        rows="10"
                                        rendered="#{contactDetailsDataModel.rowCount > 0}">

                            <rich:column sortBy="#{_contactDetails.contactType}">
                                <f:facet name="header">Contact type
                                </f:facet>
                                <h:outputText value="#{_contactDetails.contactType}"/>
                            </rich:column>
                            <rich:column sortBy="#{_contactDetails.active}">
                                <f:facet name="header">Active
                                </f:facet>
                                <h:outputText value="#{_contactDetails.active}"/>
                            </rich:column>
                            <rich:column sortBy="#{_contactDetails.contactInfo}">
                                <f:facet name="header">Contact info
                                </f:facet>
                                <h:outputText value="#{_contactDetails.contactInfo}"/>
                            </rich:column>
                            <rich:column sortBy="#{_contactDetails.remarks}">
                                <f:facet name="header">Remarks
                                </f:facet>
                                <h:outputText value="#{_contactDetails.remarks}"/>
                            </rich:column>

                            <rich:column styleClass="action">
                                <f:facet name="header">Action</f:facet>
                                <s:link view="/#{empty from ? 'ContactDetails' : from}View.xhtml"
                                        value="#{empty from ? 'View' : 'Select'}"
                                        propagation="#{empty from ? 'none' : 'default'}"
                                        id="contactDetailsViewId">
                                    <f:param name="contactDetailsId"
                                             value="#{_contactDetails.id}"/>
                                    <f:param name="contactDetailsFrom" value="ClinicContactsView"/>
                                </s:link>
                                #{' '}
                                <s:link view="/ContactDetailsEdit.xhtml"
                                        value="Edit"
                                        propagation="none"
                                        id="contactDetailsEdit"
                                        rendered="#{empty from}">
                                    <f:param name="contactDetailsId"
                                             value="#{_contactDetails.id}"/>
                                    <f:param name="contactDetailsFrom" value="ClinicContactsView"/>
                                </s:link>
                            </rich:column>
                        </rich:dataTable>
                    </div>
                    <s:div styleClass="actionButtons" rendered="#{empty from}">
                        <s:button view="/ContactDetailsEdit.xhtml"
                                  id="create"
                                  propagation="none"
                                  value="Add Contact Details">
                            <f:param name="clinicContactsId" value="#{clinicContactsHomeFacade.instance.id}"/>
                            <f:param name="contactDetailsFrom" value="ClinicContactsView"/>
                        </s:button>
                    </s:div>

                </rich:tab>
                <rich:tab label="Doc Codes">
                    <rich:dataTable id="docCodesTable"
                                    var="_docCodes"
                                    value="#{docCodesDataModel}"
                                    rows="10"
                                    rendered="#{docCodesDataModel.rowCount > 0}">
                        <rich:column sortBy="#{_docCodes.active}">
                            <f:facet name="header">Doc Code
                            </f:facet>
                            <h:outputText value="#{_docCodes.docCode}"/>
                        </rich:column>
                        <rich:column sortBy="#{_docCodes.active}">
                            <f:facet name="header">Doctor
                            </f:facet>
                            <h:outputText value="#{_docCodes.doctorContacts.name}"/>
                        </rich:column>
                        <rich:column styleClass="action">
                            <f:facet name="header">Action</f:facet>
                            <s:link view="/#{empty from ? 'DocCodes' : from}View.xhtml"
                                    value="#{empty from ? 'View' : 'Select'}"
                                    propagation="#{empty from ? 'none' : 'default'}"
                                    id="docCodesViewId">
                                <f:param name="docCodesId"
                                         value="#{_docCodes.id}"/>
                                <f:param name="docCodesFrom" value="ClinicContactsView"/>
                                <f:param name="doctorContactsId" value="#{_docCodes.doctorContacts.id}"/>
                            </s:link>
                            #{' '}
                            <s:link view="/DocCodesEdit.xhtml"
                                    value="Edit"
                                    propagation="none"
                                    id="docCodesEdit"
                                    rendered="#{empty from}">
                                <f:param name="docCodesId"
                                         value="#{_docCodes.id}"/>
                                <f:param name="docCodesFrom" value="ClinicContactsView"/>
                                <f:param name="doctorContactsId" value="#{_docCodes.doctorContacts.id}"/>
                            </s:link>
                        </rich:column>
                    </rich:dataTable>


                    <rich:datascroller for="docCodesTable" rendered="#{docCodesDataModel.rowCount > 0}"/>

                    <s:div styleClass="actionButtons" rendered="#{empty from}">
                        <s:button view="/DocCodesEdit.xhtml"
                                  id="createDocCode"
                                  propagation="none"
                                  value="Create DocCode">
                            <f:param name="clinicContactsId" value="#{clinicContactsHomeFacade.instance.id}"/>
                            <f:param name="docCodesFrom" value="ClinicContactsView"/>
                        </s:button>
                    </s:div>

                </rich:tab>
            </rich:tabPanel>

        </rich:panel>
    </h:form>
</ui:define>

</ui:composition>

ClinicContactsView.page.xhtml 的代码：

    <?xml version="1.0" encoding="UTF-8"?>
<page xmlns="http://jboss.com/products/seam/pages"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://jboss.com/products/seam/pages http://jboss.com/products/seam/pages-2.1.xsd">

   <param name="docCodesFrom" validator="ClinicContactView"/>
   <param name="clinicContactsFrom"/>
   <param name="clinicContactsId" value="#{clinicContactsHome.clinicContactsId}"/>
   <param name="clinicContactsId" value="#{clinicContactsHomeFacade.clinicContactsId}"/>
   <param name="clinicContactsId" value="#{contactDetailsDataModel.contactId}"/>
</page>

DocCodesEdit.xhtml

    <!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
                xmlns:s="http://jboss.com/products/seam/taglib"
                xmlns:ui="http://java.sun.com/jsf/facelets"
                xmlns:f="http://java.sun.com/jsf/core"
                xmlns:h="http://java.sun.com/jsf/html"
                xmlns:a="http://richfaces.org/a4j"
                xmlns:rich="http://richfaces.org/rich" xmlns:a4j="http://richfaces.org/a4j"
                template="layout/template.xhtml">

<ui:define name="body">

<h:form id="docCodes" styleClass="edit">

    <rich:panel style="width:550px;">
        <f:facet name="header">#{docCodesHomeFacade.managed ? 'Edit' : 'Add'} Doc code</f:facet>

        <div style="float:left;width:350;">
            <s:decorate id="doctorField" template="layout/edit.xhtml">
                <ui:define name="label">Doctor</ui:define>
                <h:inputText id="docCode"
                             required="true"
                             size="30"
                             maxlength="45"
                             value="#{doctorContactsHomeFacade.getInstance().name}">
                    <a:support event="onblur" reRender="docCodeField" bypassUpdates="true" ajaxSingle="true"/>
                </h:inputText>
            </s:decorate>
            <s:decorate id="docCodeField" template="layout/edit.xhtml">
                <ui:define name="label">Doc code</ui:define>
                <h:inputText id="docCode"
                             required="true"
                             size="30"
                             maxlength="45"
                             value="#{docCodesHomeFacade.instance.docCode}">
                    <a:support event="onblur" reRender="docCodeField, doctorContactsTable" bypassUpdates="true"
                               ajaxSingle="true"/>
                </h:inputText>
            </s:decorate>
        </div>
        <!--LOOKUP for doctor name: Button and Modal Panel-->
        <div style="float:right;width:80px;margin-right:0px;">
            <a4j:commandButton style="display:block;width:80px;margin-top:8px;" reRender="doctorContactsTable"
                               onclick="Richfaces.showModalPanel('pnl');"
                               value="Lookup">
            </a4j:commandButton>

        </div>

        <div style="clear:both">
            <span class="required">*</span>
            required fields
        </div>

    </rich:panel>

    <rich:spacer height="20"/>
    <rich:panel style="width:90%"
                rendered="#{not empty doctorContactsHomeFacade.doctorContactsId || not empty clinicContactsHomeFacade.clinicContactsId}">
        <f:facet
                name="header">Contact Details</f:facet>
        <!--Doctors' Contact Details-->
        <div class="results" id="contactDetailsListDoctors">

            <h:outputText value="The contactDetails search returned no results."
                          rendered="#{contactDetailsDataModel.rowCount == 0}"/>
            <rich:dataTable id="contactDetailsTableDoctors"
                            var="_contactDetails"
                            value="#{contactDetailsDataModel}"
                            rows="10"
                            rendered="#{contactDetailsDataModel.rowCount > 0}">
                <rich:column sortBy="#{_contactDetails.active}">
                    <f:facet name="header">Clinic/Doctor Name
                    </f:facet>
                    <h:outputText value="#{_contactDetails.contacts.name}"/>
                </rich:column>
                <rich:column sortBy="#{_contactDetails.contactInfo}">
                    <f:facet name="header">Contact Details
                    </f:facet>
                    <h:outputText value="#{_contactDetails.contactInfo}"/>
                </rich:column>
                <rich:column sortBy="#{_contactDetails.contactType}">
                    <f:facet name="header">Contact type
                    </f:facet>
                    <h:outputText value="#{_contactDetails.contactType}"/>
                </rich:column>

                <rich:column styleClass="action">
                    <f:facet name="header">Send?</f:facet>
                    <a:region>
                        <h:selectBooleanCheckbox>
                            <!--<a4j:support event="onselect" ajaxSingle="true" action="#{docCodesHomeFacade.addSelectedContactId()}"/>-->
                            <a4j:support event="onclick"
                                         action="#{docCodesHomeFacade.addSelectedContactId(_contactDetails.id)}"
                                         ignoreDupResponses="true">
                            </a4j:support>
                        </h:selectBooleanCheckbox>
                    </a:region>
                </rich:column>
            </rich:dataTable>
        </div>
    </rich:panel>

    <div class="actionButtons">

        <h:commandButton id="save"
                         value="Save"
                         action="#{docCodesHomeFacade.persist}"
                         disabled="#{!docCodesHomeFacade.wired}"
                         rendered="#{!docCodesHomeFacade.managed}"/>

        <h:commandButton id="update"
                         value="Save"
                         action="#{docCodesHomeFacade.update}"
                         rendered="#{docCodesHomeFacade.managed}"/>

        <h:commandButton id="delete"
                         value="Delete"
                         action="#{docCodesHomeFacade.remove}"
                         immediate="true"
                         rendered="#{docCodesHomeFacade.managed}"/>

        <s:button id="cancelEdit"
                  value="Cancel"
                  propagation="end"
                  view="/ClinicContactsView.xhtml" includePageParams="true"
                  rendered="#{docCodesHomeFacade.managed}"/>

        <s:button id="cancelAdd"
                  value="Cancel"
                  propagation="end"
                  view="/#{empty docCodesFrom ? 'DocCodesList' : docCodesFrom}.xhtml"
                  rendered="#{!docCodesHomeFacade.managed}"/>

    </div>
</h:form>

<!--RICH MODAL PANEL to LOOKUP for Doctors-->
<!--  <a4j:form>-->
<a:form>
    <rich:modalPanel id="pnl" width="800" height="500">

        <f:facet name="header">
            <h:outputText value="Select Doctor"/>
        </f:facet>

        <f:facet name="controls">
            <h:panelGroup>
                <h:graphicImage value="/img/icons/close.gif" style="cursor:pointer" id="hidelink"/>
                <rich:componentControl for="pnl" attachTo="hidelink" operation="hide"
                                       event="onclick"/>
            </h:panelGroup>
        </f:facet>

       <!-- some unsignificant code removed --!>
        <div class="actionButtons">
            <a:commandButton id="search" value="Search" reRender="doctorContactsTable"/>
            <s:button id="reset" value="Reset" includePageParams="false"/>
        </div>

        <rich:panel>
            <f:facet
                    name="header">Doctors Search Results</f:facet>

            <div class="results" id="doctorsContactsList">
                <h:outputText
                        value="The doctors contact search returned no results."
                        rendered="#{doctorContactsDataModel.rowCount == 0}"/>
                <rich:dataTable
                        id="doctorContactsTable" var="_doctorContact" value="#{doctorContactsDataModel}"
                        rows="10" rendered="#{doctorContactsDataModel.rowCount > 0}">

                    <rich:column sortBy="#{_doctorContact.name}">
                        <f:facet name="header">Doctor </f:facet>
                        <h:outputText value="#{_doctorContact.name}"/>
                    </rich:column>

                    <rich:column sortBy="#{_doctorContact.state}">
                        <f:facet name="header">SMC </f:facet>
                        <h:outputText value="#{_doctorContact.nationalCode}"/>
                    </rich:column>

                    <rich:column sortBy="#{_doctorContact.state}">
                        <f:facet name="header">Address 1 </f:facet>
                        <h:outputText value="#{_doctorContact.address1}"/>
                    </rich:column>

                    <rich:column sortBy="#{_doctorContact.state}">
                        <f:facet name="header">Address 2</f:facet>
                        <h:outputText value="#{_doctorContact.address2}"/>
                    </rich:column>

                    <rich:column sortBy="#{_doctorContact.state}">
                        <f:facet name="header">Postal Code </f:facet>
                        <h:outputText value="#{_doctorContact.postalCode}"/>
                    </rich:column>

                    <rich:column styleClass="action">
                        <f:facet name="header">#{messages['action']}</f:facet>
                        <s:button view="/DocCodesEdit.xhtml"
                                  id="loadDoctor"
                                  propagation="none"
                                  value="Select" includePageParams="true">
                            <f:param name="doctorContactsId" value="#{_doctorContact.id}"/>
                        </s:button>
                    </rich:column>
                </rich:dataTable></div>
        </rich:panel>

        <rich:datascroller for="doctorContactsTable" rendered="#{doctorContactsDataModel.rowCount > 0}"/>

    </rich:modalPanel>
</a:form>

</ui:define>

</ui:composition>

DocCodesEdit.page.xml

 <?xml version="1.0" encoding="UTF-8"?>
<page xmlns="http://jboss.com/products/seam/pages"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://jboss.com/products/seam/pages http://jboss.com/products/seam/pages-2.1.xsd"
      no-conversation-view-id="/DocCodesList.xhtml"
      login-required="true">

    <begin-conversation join="true" flush-mode="MANUAL"/>

    <action execute="#{docCodesHomeFacade.wire}"/>
    <param name="docCodesFrom"/>
    <param name="docCodesId" value="#{docCodesHome.docCodesId}"/>
    <param name="docCodesId" value="#{docCodesHomeFacade.docCodesId}"/>
    <param name="clinicContactsFrom"/>
    <param name="clinicContactsId" value="#{clinicContactsHome.clinicContactsId}"/>
    <param name="clinicContactsId" value="#{clinicContactsHomeFacade.clinicContactsId}"/>

    <param name="doctorContactsFrom"/>
    <param name="doctorContactsId" value="#{doctorContactsHome.doctorContactsId}"/>
    <param name="doctorContactsId" value="#{doctorContactsHomeFacade.doctorContactsId}"/>
    <action execute="#{contactDetailsDataModel.setDoctorContactId(doctorContactsId)}" if="#{not empty doctorContactsId}"></action>
    <action execute="#{contactDetailsDataModel.setClinicContactId(clinicContactsId)}" if="#{not empty clinicContactsId}"></action>

    <navigation from-action="#{docCodesHomeFacade.persist}">
        <rule if-outcome="persisted">
            <end-conversation/>
            <redirect view-id="/#{empty docCodesFrom ? 'DocCodesList' : docCodesFrom}.xhtml"
                      include-page-params="true">
                <param name="clinicContactsId" value="#{docCodesHomeFacade.getInstance().getClinicContacts().getId()}"/>
            </redirect>
        </rule>
    </navigation>

    <navigation from-action="#{docCodesHomeFacade.update}">
        <rule if-outcome="updated">
            <end-conversation/>
            <redirect view-id="/#{empty docCodesFrom ? 'DocCodesList' : docCodesFrom}.xhtml"
                      include-page-params="true">
                <param name="clinicContactsId" value="#{docCodesHomeFacade.getInstance().getClinicContacts().getId()}"/>
            </redirect>
        </rule>
    </navigation>

    <navigation from-action="#{docCodesHomeFacade.remove}">
        <rule if-outcome="removed">
            <end-conversation/>
            <redirect view-id="/#{empty docCodesFrom ? 'DocCodesList' : docCodesFrom}.xhtml"
                      include-page-params="true">
                <param name="clinicContactsId" value="#{docCodesHomeFacade.getInstance().getClinicContacts().getId()}"/>
            </redirect>
        </rule>
    </navigation>

</page>

请告诉我此代码是否足够。在 DocCodesEdit.xhtml 上按“完成”或“取消”，出现问题，因此不会调用来自支持 bean 的 java 代码...

Answer 1

问题确实出在新代码中：它隐藏在 ClinicContactsView.page.xml 中（您将其写为上面的 .xhtml，但我假设您指的是页面描述符） 。其中有一行

<param name="docCodesFrom" validator="ClinicContactView"/>

，在按下 Cancel 并返回该页面后，您尝试将字符串 (ClinicContactView) 转换为验证器，该验证器获胜不工作。您可能还想在此处使用 value 属性。