確認後，導航到嚮導的第一個選項卡

Question

幾乎所有的東西都在主題標題中說明。我需要實現的是當我在嚮導的最後（確認）選項卡中並單擊我的按鈕時，完成後，我想回到嚮導的第一個選項卡。當然，在此之後，嚮導中的所有內容都應該重置。

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那麼，這是沒有幫助。目前我完全困惑。在按鈕的點擊，我得到這個例外，但不是在服務器日誌，只有在瀏覽器中，我得到：

中出現錯誤：

顯示java.lang.NullPointerException

java.lang.NullPointerException 
at org.primefaces.component.datatable.DataHelper.decodeFilters(DataHelper.java:167) 
at org.primefaces.component.datatable.DataTableRenderer.decode(DataTableRenderer.java:51) 
at javax.faces.component.UIComponentBase.decode(UIComponentBase.java:790) 
at javax.faces.component.UIData.processDecodes(UIData.java:980) 
at org.primefaces.component.datatable.DataTable.processDecodes(DataTable.java:542) 
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1042) 
at org.primefaces.component.panel.Panel.processDecodes(Panel.java:282) 
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1042) 
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1042) 
at org.primefaces.component.wizard.Wizard.processDecodes(Wizard.java:210) 
at javax.faces.component.UIForm.processDecodes(UIForm.java:216) 
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1042) 
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1042) 
at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:941) 
at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.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:312) 
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188) 
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641) 
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97) 
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185) 
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226) 
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165) 
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791) 
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693) 
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954) 
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170) 
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135) 
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102) 
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88) 
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76) 
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53) 
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57) 
at com.sun.grizzly.ContextTask.run(ContextTask.java:69) 
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330) 
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309) 
at java.lang.Thread.run(Thread.java:619) 

按鈕看起來是這樣的：

<p:commandButton ajax="false" value="Save service" action="#{kuBean.saveService}" 
             update="growl"/> 

Answer 1

有趣......

假設你的bean是@ViewScoped然後一個簡單的頁面重定向到你的嚮導頁面的url應該重新實例化你的嚮導託管bean。如果這不起作用，您可以將GET屬性[url]?faces-redirect=true附加到URL。

但是，如果您的託管bean是@SessionScoped，那麼這將不起作用，然而由於上一次嚮導確認中的數據和狀態信息可能仍然存在。最好的解決方案是切換到ViewScoped，如果這是不可能的，那麼寫一個託管bean的重置方法，它可以清除託管bean的狀態和數據。

Answer 2

嘗試使用p的flowListener：嚮導

<p:wizard flowListener="#{userWizard.handleFlow}"> 
... 
</p:wizard> 

在bean

：

public String handleFlow(FlowEvent event) { 
    String currentStepId = event.getCurrentStep(); 
    String stepToGo = event.getNextStep(); 
    //if(skip) 
    //return "confirm"; 
    //else 
    //return event.getNextStep(); 

    ... portion where you are to return to the first tab 
    return "id_value_of_first_tab"; 
}