JSF DataModel vs Java List问题(无可用行异常) [英] Jsf DataModel vs Java List problem ( no row available exception )
问题描述
在JSF 1.2中，一个正在使用Java List列出项目:
In JSF 1.2 One was listing Items using Java List :
private List<Customer> customerItems = null;
，但是在JSF 2.0中，要使用JSf DataModel(ListDataModel). (我正在使用JSF 2.0)
, but in JSF 2.0 JSf DataModel (ListDataModel) is the way to go. (I am using JSF 2.0)
private DataModel customerItems = null;
public abstract DataModel createPageDataModel();
但是，我仍然不知道如何有效地使用它.确切地说，我什至无法实现一个简单而强制的情况，即导航.
However, I still don't get how to efficiently work with it. Rather say, I can't even implement a simple and mandatory case which is, navigation.
我有一个<h:datatable value =#{customerController}" var ="customer">，它从名为"customerController"的客户托管bean中获取行对象.
I have a <h:datatable value="#{customerController}" var="customer"> that gets its row objects from Customer managed bean named "customerController".
最后一列包含一个命令链接，该链接调用一种方法来查看所选行的详细信息页面.一切正常.
the last column holds a command link that calls a method to viewing the details page of the selected row. It is working fine.
<h:column>
<h:commandButton value="View me" action="#{customerController.prepareDetails}"/>
</h:column>
在给定风俗的详细视图页面中，我有一个数据表，其中包含一个订单列表 一切都很好，表格已填充，订单中显示了与订单属性相对应的几列.
When in the detail view page of given custom, I have a data table that holds a list of orders Everything is fine, the table is populated and the orders are displayed with several columns corresponding to the order attributes.
.....
<h:outputText value="customer.selected.name" />
<h:datatable value="#{customer.selected.orderList}" var="order">
......
同一数据表的最后一列包含一个命令链接，可导航到所选订单的详细信息页面:
This same datatable's last column holds a command link to navigating to the detail page of the selected order:
痛苦来了.我收到没有可用行异常:
And here comes the pain. I get No Row Available Exception :
javax.faces.model.NoRowAvailableException
- Stack Trace
javax.faces.el.EvaluationException: javax.faces.model.NoRowAvailableException
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIData.broadcast(UIData.java:1093)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
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:409)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1534)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
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:326)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:227)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:170)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:822)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:719)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1013)
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: javax.faces.model.NoRowAvailableException
at javax.faces.model.ListDataModel.getRowData(ListDataModel.java:150)
at jsf.EvaluationController.prepareView(EvaluationController.java:82)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.el.parser.AstValue.invoke(AstValue.java:234)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
... 34 more
谢谢您的帮助.
推荐答案
首先检查您的customerBean的范围，它应该是 viewScoped 或 SessionScoped .
Firstly check the scope of your customerBean it should be either a viewScoped or SessionScoped.
另一件事可能是 glassfish 的问题，该问题需要在xml文件中配置 maven依赖.请参阅此链接. http://mavenhub.com/c/javax/faces/model/norowavailableexception 最后要检查的是您的列表.尝试对其进行调试，以查看其中列出了所有属性并在UI上进行填充.
Another thing could be a problem of glassfish which needs a maven dependency configured in the xml files.See this link. http://mavenhub.com/c/javax/faces/model/norowavailableexception Last thing to check is your list.Try to debug it and see it has all the properties listed in it which you are populating it on the UI.
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