【发布时间】：2011-10-23 15:34:17
【问题描述】：
我有一个带有 ui:repeat 标记的 facelets 页面，它输出 HTML 表的行并且每一行都接受用户输入。这很好用。我还有第二组数据，我使用相同的页面和转发器（只是不同的数据）输出。支持此页面的支持 bean 是 ConversationScoped。
<ui:repeat value="#{cloneBuilderBean.pageTemplate}" var="row" varStatus="status">
<tr>
<td>#{row.label}</td>
<td><h:inputText value=#{row.value}/></td>
</tr>
</ui:repeat>
我遇到的问题是当用户单击 h:commandButton 以“继续”到下一页时。这实际上只是重新显示当前页面，但转发器的集合已更新为一组新数据。从我的调试来看，我什至没有得到我的操作方法，该方法应该由于单击命令按钮转到下一页而触发。下面的堆栈跟踪也没有显示任何命中我的代码的迹象。有关如何解决此错误的任何想法？
javax.faces.component.UpdateModelException: java.lang.ClassCastException
at javax.faces.component.UIInput.updateModel(UIInput.java:853)
at javax.faces.component.UIInput.processUpdates(UIInput.java:735)
at com.sun.faces.facelets.component.UIRepeat.process(UIRepeat.java:525)
at com.sun.faces.facelets.component.UIRepeat.processUpdates(UIRepeat.java:748)
at javax.faces.component.UIForm.processUpdates(UIForm.java:281)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1242)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1242)
at javax.faces.component.UIViewRoot.processUpdates(UIViewRoot.java:1231)
at com.sun.faces.lifecycle.UpdateModelValuesPhase.execute(UpdateModelValuesPhase.java:78)
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 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.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.http.ProcessorTask.doProcess(ProcessorTask.java:725)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
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:662)
Caused by: java.lang.ClassCastException
at javax.el.ArrayELResolver.setValue(ArrayELResolver.java:257)
at com.sun.faces.el.DemuxCompositeELResolver._setValue(DemuxCompositeELResolver.java:255)
at com.sun.faces.el.DemuxCompositeELResolver.setValue(DemuxCompositeELResolver.java:281)
at com.sun.el.parser.AstValue.setValue(AstValue.java:197)
at com.sun.el.ValueExpressionImpl.setValue(ValueExpressionImpl.java:286)
at org.jboss.weld.el.WeldValueExpression.setValue(WeldValueExpression.java:74)
at com.sun.faces.facelets.el.TagValueExpression.setValue(TagValueExpression.java:131)
at javax.faces.component.UIInput.updateModel(UIInput.java:818)
... 41 more
更新：相关的bean代码是这样的：
private int[] part1,part2;
private int[] currentPart; //pointer to part1 or part2
private List<SelectItem> pageTemplate;
public String openItem(String value){
conversation.begin();
//database dummy data...
pageTemplate = new ArrayList(4);
pageTemplate.add(new SelectItem("Data1"));
pageTemplate.add(new SelectItem("Data2"));
pageTemplate.add(new SelectItem("Data3"));
pageTemplate.add(new SelectItem("Data4"));
//database dummy data...
part1 = new int[4];
for(int i = 0; i < part1.length; i++){
part1[i] = i+1;
}
currentPart = part1;
return "page2";
}
public String next(){
//database dummy data...
part2 = new int[4];
for(int i = 0; i < part2.length; i++){
part2[i] = i+2;
}
currentPart = part2;
return "page2";
}
相关视图代码为：
<ui:repeat value="#{CloneBuilderBean.pageTemplate}" var="row" varStatus="status">
<tr>
<td>#{row.value}</td>
<td width="300">
<h:inputHidden id="val" value="#{CloneBuilderBean.currentPart[status.index]}" />
<p:slider for="val" step="1" style="width:90%;" minValue="0" maxValue="7" />
</td>
</tr>
</ui:repeat>
<h:commandButton value="display part 2" action="#{CloneBuilderBean.next()}"/>
【问题讨论】：
标签： jsf jsf-2 facelets el classcastexception