java - ICEFaces 3.1：ビューの再レンダリング中にNullPointerExceptionが発生しました

Question

ICEFacesで問題が発生しています。ビューを適切に更新できないようです。
いくつかのデバッグセッションのおかげで見つけた奇妙な動作のビュー、フロー、Bean、および詳細を提供します。

基本的に、遅延ロードされたace：DataTableを扱っています。

<ace:dataTable id="blocchiTable" [..] />

いくつかの行を選択し、「Modifica」（イタリア語で「編集」）というラベルの付いたボタンをクリックします。

<ace:menuItem id="modificaBloccoButton" value="Modifica" action="modificaBlocco" icon="ui-icon ui-icon-pencil" />`

フローでわかるように、関連するクリックイベントは、フローを決定状態に導きます。

<view-state id="creablocco" view="creablocco.xhtml">
    [.. other stuff ..]
    <transition on="modificaBlocco" to="decidiModifica">
        <evaluate expression="flowScope.blocchiBean.getRigheSelezionate()" result="flowScope.righeSelezionate"/>
    </transition>
</view-state>
<decision-state id="decidiModifica">
    <if test="!(flowScope.righeSelezionate).isEmpty()" then="modificaBlocco" else="fine" />
</decision-state>

その後、初期状態の同じビューに関連付けられた別のビューステート。新しいビューステートに入るとき、フローはBeanに適切な行に対してcellEditorを有効にするように要求します。これにより、ビューが再レンダリングされるときに、選択された行が編集可能になります。

<view-state id="modificaBlocco" view="creablocco.xhtml">
    <on-entry>
        <evaluate expression="flowScope.blocchiBean.abilitaModifica()"/>
    </on-entry>    
    <transition on="salvaModificheBlocco" to="fine">
        <evaluate expression="flowScope.blocchiBean.salvaBlocchi()"/>
    </transition>
</view-state>

残念ながら、ビューの再レンダリング中に（<on-entry>セクションで指定されたメソッドが実際に呼び出されることをすでに確認しました）、次の例外が発生します。

AVVERTENZA: queued exception
java.lang.NullPointerException
    at org.icefaces.impl.util.DOMUtils.isWhitespaceText(DOMUtils.java:394)
    at org.icefaces.impl.util.DOMUtils.printNode(DOMUtils.java:351)
    at org.icefaces.impl.util.DOMUtils.printNode(DOMUtils.java:355)
    at org.icefaces.impl.util.DOMUtils.printNode(DOMUtils.java:355)
    at org.icefaces.impl.util.DOMUtils.printNode(DOMUtils.java:355)
    at org.icefaces.impl.util.DOMUtils.printNode(DOMUtils.java:306)
    at org.icefaces.impl.util.DOMUtils.printNode(DOMUtils.java:290)
    at org.icefaces.impl.context.DOMResponseWriter.endDocument(DOMResponseWriter.java:225)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:410)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
    at org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    at org.springframework.faces.webflow.FlowLifecycle.render(FlowLifecycle.java:80)
    at org.springframework.faces.webflow.JsfView.render(JsfView.java:89)
    at org.springframework.webflow.engine.ViewState.render(ViewState.java:296)
    at org.springframework.webflow.engine.ViewState.refresh(ViewState.java:243)
    at org.springframework.webflow.engine.ViewState.resume(ViewState.java:221)
    at org.springframework.webflow.engine.Flow.resume(Flow.java:545)
    at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:258)
    at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169)
    at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
    at org.springframework.faces.webflow.JsfFlowHandlerAdapter.handle(JsfFlowHandlerAdapter.java:48)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:311)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:101)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:182)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:173)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at com.springsource.insight.collection.tcserver.request.HttpRequestOperationCollectionValve.traceNextValve(HttpRequestOperationCollectionValve.java:112)
    at com.springsource.insight.collection.tcserver.request.HttpRequestOperationCollectionValve.invoke(HttpRequestOperationCollectionValve.java:94)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)

これは完全なビューです：

<?xml version="1.0"?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
                xmlns:ui="http://java.sun.com/jsf/facelets"
                xmlns:ace="http://www.icefaces.org/icefaces/components" 
                xmlns:ice="http://www.icesoft.com/icefaces/component"
                xmlns:h="http://java.sun.com/jsf/html"
                xmlns:f="http://java.sun.com/jsf/core"
                template="/resources/includes/templates/template.xhtml">
    <ui:param name="pageTitle" value="Crea blocco" />
    <ui:define name="page-content">
        <ace:panel id="personalInfoInputPanel" header="Crea blocco">
            <div class="div_creablocco">
                <h:form id="creabloccoform">
                    <h:panelGrid id="creabloccoInputGrid" columns="1" styleClass="table_creablocco">
                        <ace:textEntry id="numeroFile" value="#{creaBloccoBean.numeroFile}" label="Numero file:" labelPosition="left" required="true" requiredIndicator="(*)" indicatorPosition="right">
                        </ace:textEntry>
                        <ace:textEntry id="numeroColonne" value="#{creaBloccoBean.numeroColonne}" label="Numero colonne:" labelPosition="left" required="true" requiredIndicator="(*)" indicatorPosition="right">
                        </ace:textEntry>
                        <ace:textEntry id="posizioneX" value="#{creaBloccoBean.posizioneX}" label="Coordinata X:" labelPosition="left" required="true" requiredIndicator="(*)" indicatorPosition="right">
                        </ace:textEntry>
                        <ace:textEntry id="posizioneY" value="#{creaBloccoBean.posizioneY}" label="Coordinata Y:" labelPosition="left" required="true" requiredIndicator="(*)" indicatorPosition="right">
                        </ace:textEntry>
                        <ace:pushButton id="pushBttnCreaBlocco"  value="Crea blocco" action="creaBlocco"/>
                    </h:panelGrid>
                </h:form>
            </div>
        </ace:panel>

        <ace:panel id="blocchiPanel" header="Blocchi">
            <h:form id="blocchiTableForm">
                <ace:menuBar id="iconeBloccoMenu" rendered="#{!blocchiBean.modificaInCorso}">
                    <ace:menuItem id="dettagliBloccoButton" value="Dettagli" action="dettagliBlocco" icon="ui-icon ui-icon-search" />
                    <ace:menuItem id="modificaBloccoButton" value="Modifica" action="modificaBlocco" icon="ui-icon ui-icon-pencil" />
                    <ace:menuItem id="cancellaBloccoButton" value="Cancella" action="cancellaBlocco" icon="ui-icon ui-icon-closethick" />
                </ace:menuBar>
                <ace:menuBar id="iconeModificaBloccoMenu" rendered="#{flowScope.blocchiBean.modificaInCorso}">
                    <ace:menuItem id="annullaModificheButton" value="Annulla" action="annullaModificheBlocco" icon="ui-icon ui-icon-arrow-1-w" />
                    <ace:menuItem id="salvaModifiche" value="Salva" action="salvaModificheBlocco" icon="ui-icon ui-icon-disk" />
                </ace:menuBar>
                <ace:dataTable id="blocchiTable" value="#{blocchi}"
                    binding="#{flowScope.blocchiBean.table}" stateMap="#{flowScope.blocchiBean.stateMap}"
                    selectionMode="multiple" doubleClickSelect="false"
                    rowSelectListener="#{flowScope.blocchiBean.selectListener}"
                    rowUnselectListener="#{flowScope.blocchiBean.deselectListener}" var="blocco"
                    lazy="true" rows="10" paginator="true" paginatorPosition="bottom">
                    <ace:column id="idBloccoColumn" headerText="ID" styleClass="id">
                        <h:outputText id="idBloccoText" value="#{blocco.id}" />
                    </ace:column>
                    <ace:column id="numeroFileBloccoColumn" headerText="Numero file"
                        styleClass="numFile">
                        <ace:cellEditor>
                            <f:facet name="output">
                                <h:outputText id="numeroFileBloccoText"
                                    value="#{blocco.numeroFile}" />
                            </f:facet>
                            <f:facet name="input">
                                <h:inputText id="numeroFileBloccoInput"
                                    value="#{blocco.numeroFile}" />
                            </f:facet>
                        </ace:cellEditor>

                    </ace:column>
                    <ace:column id="numeroColonneBloccoColumn"
                        headerText="Numero colonne" styleClass="numColonne">
                        <ace:cellEditor>
                            <f:facet name="output">
                                <h:outputText id="numeroColonneBloccoText"
                                    value="#{blocco.numeroColonne}" />
                            </f:facet>
                            <f:facet name="input">
                                <h:inputText id="numeroColonneBloccoInput"
                                    value="#{blocco.numeroColonne}" />
                            </f:facet>
                        </ace:cellEditor>

                    </ace:column>
                    <ace:column id="posizioneXBloccoColumn" headerText="Posizione X"
                        styleClass="posX">
                        <ace:cellEditor>
                            <f:facet name="output">
                                <h:outputText id="posizioneXBloccoText"
                                    value="#{blocco.posizioneX}" />
                            </f:facet>
                            <f:facet name="input">
                                <h:inputText id="posizioneXBloccoInput"
                                    value="#{blocco.posizioneX}" />
                            </f:facet>
                        </ace:cellEditor>

                    </ace:column>
                    <ace:column id="posizioneYBloccoColumn" headerText="Posizione Y"
                        styleClass="posY">
                        <ace:cellEditor>
                            <f:facet name="output">
                                <h:outputText id="posizioneYBloccoText"
                                    value="#{blocco.posizioneY}" />
                            </f:facet>
                            <f:facet name="input">
                                <h:inputText id="posizioneYBloccoInput"
                                    value="#{blocco.posizioneY}" />
                            </f:facet>
                        </ace:cellEditor>

                    </ace:column>
                </ace:dataTable>
            </h:form>
        </ace:panel>
    </ui:define>
</ui:composition>

これは完全なフローです：

<?xml version="1.0" encoding="UTF-8"?>
<flow xmlns="http://www.springframework.org/schema/webflow"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/webflow
        http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd">

    <var name="creaBloccoBean" class="com.infoone.siglo.viewbeans.CreaBloccoBean" />
    <var name="blocchiBean" class="com.infoone.siglo.viewbeans.BlocchiBean" />

    <view-state id="creablocco" view="creablocco.xhtml">
        <on-entry>
            <evaluate expression="flowScope.blocchiBean.getBlocchi()" result="flowScope.blocchi" />
        </on-entry>
        <transition on="creaBlocco" to="fine">
            <evaluate expression="gestoreBlocchiCtr.creaBlocco(creaBloccoBean)" />
        </transition>
        <transition on="cancellaBlocco" to="decidiCancellazione">
            <evaluate expression="flowScope.blocchiBean.getRigheSelezionate()" result="flowScope.righeSelezionate"/>
        </transition>
        <transition on="modificaBlocco" to="decidiModifica">
            <evaluate expression="flowScope.blocchiBean.getRigheSelezionate()" result="flowScope.righeSelezionate"/>
        </transition>
    </view-state>

    <decision-state id="decidiCancellazione">
        <if test="!(flowScope.righeSelezionate).isEmpty()" then="cancellaBlocco" else="fine" />
    </decision-state>
    <decision-state id="decidiModifica">
        <if test="!(flowScope.righeSelezionate).isEmpty()" then="modificaBlocco" else="fine" />
    </decision-state>

    <action-state id="cancellaBlocco">
        <evaluate expression="gestoreBlocchiCtr.rimuoviBlocchi(flowScope.righeSelezionate)" />
        <transition to="fine"/>
    </action-state>
    <view-state id="modificaBlocco" view="creablocco.xhtml">
        <on-entry>
            <evaluate expression="flowScope.blocchiBean.abilitaModifica()"/>
        </on-entry>    
        <transition on="salvaModificheBlocco" to="fine">
            <evaluate expression="flowScope.blocchiBean.salvaBlocchi()"/>
        </transition>
    </view-state>

    <end-state id="fine" />

</flow>

どのUIコンポーネントがそのような例外を引き起こしているのかを理解しようとしましたが、幸いなことに、デバッグモードのサーバーでWebアプリを起動することでそれを分離することができました。基本的に、これは<script>22個のtextElementの子を持つノードです。3番目の子が例外を引き起こしています：

<script>
    |------ null_icefaces_config
    |------ ', '
    |------ null <<===== (This is the node which causes the exception. I mean exactly the null value associated to the "NULL type", here)
    |------ ', '
    |------ unknownWindow
    |------ [.. other children ..]

また、応答の内容で徐々に満たされる出力ストリームを含むオブジェクトであるライターオブジェクトの内容も調べました。この要素をレンダリングすることによって生成される部分は次のとおりです。

<script>ice.setupBridge('null_icefaces_config

同様の問題に直面したことがありますか？このケースをICEFacesのスタッフに報告して、バグかどうかを確認できるようにする必要があると思いますか？

score 2 · Accepted Answer

WebflowナビゲーションモデルをJSFと統合する方法に問題があります。ICEFacesコードは、フェーズリスナーを使用してリクエストから情報のビットを抽出します。このフェーズリスナーは、POST-Redirect-GETSpringナビゲーションモデルのGET部分では実行されません。回避策があります。これは、そのような状況でPhaseListenerの代わりとなるFlowExecutionListenerを実装することです。ここでリスナーのチュートリアルと実装例を参照してください。

http://wiki.icesoft.org/display/ICE/Spring+Web+Flow+2.3.1

java - ICEFaces 3.1：ビューの再レンダリング中にNullPointerExceptionが発生しました

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