Null pointer Exception
hi
i am getting this exeption
09/08/21 17:34:47 ERROR webapp._ErrorPageWriter: An exception occurred
javax.faces.FacesException: java.lang.NullPointerException
at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:166)
at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:293)
at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:172)
at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:293)
at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:172)
at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:293)
at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:172)
at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:293)
at org.ajax4jsf.component.AjaxViewRoot.encodeChildren(AjaxViewRoot.java:543)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:250)
at org.apache.myfaces.application.jsp.JspViewHandlerImpl.actuallyRenderView(JspViewHandlerImpl.java:427)
at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:383)
at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:41)
at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:140)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:155)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:390)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:517)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:301)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at javax.faces.component.UIComponentBase.isRendered(UIComponentBase.java:1251)
at org.apache.myfaces.component.html.ext.AbstractHtmlGraphicImage.isRendered(AbstractHtmlGraphicImage.java:62)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:75)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxChildren(AjaxChildrenRenderer.java:67)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:115)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxChildren(AjaxChildrenRenderer.java:67)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:115)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxChildren(AjaxChildrenRenderer.java:67)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:115)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxChildren(AjaxChildrenRenderer.java:67)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:115)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxChildren(AjaxChildrenRenderer.java:67)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:115)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxChildren(AjaxChildrenRenderer.java:67)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:115)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxChildren(AjaxChildrenRenderer.java:67)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:115)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxChildren(AjaxChildrenRenderer.java:67)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:115)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxChildren(AjaxChildrenRenderer.java:67)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:115)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxChildren(AjaxChildrenRenderer.java:67)
at org.ajax4jsf.renderkit.AjaxChildrenRenderer.encodeAjaxComponent(AjaxChildrenRenderer.java:115)
at org.ajax4jsf.renderkit.AjaxContainerRenderer.encodeAjax(AjaxContainerRenderer.java:123)
at org.ajax4jsf.component.UIAjaxRegion.encodeAjax(UIAjaxRegion.java:267)
at org.ajax4jsf.component.AjaxViewRoot$4.invokeContextCallback(AjaxViewRoot.java:489)
at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:163)
... 37 more
I got this exceptin when i Renrender the Page
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<%@ taglib uri="http://myfaces.apache.org/tomahawk" prefix="t"%>
<%@ taglib uri="http://richfaces.org/a4j" prefix="a4j"%>
<%@ taglib uri="http://richfaces.org/rich" prefix="rich"%>
<link rel="stylesheet" type="text/css"
href="../styles/CommonStyleSheet.css" />
<a4j:outputPanel layout="block"
style="height: 70px; background-color: white;" rendered="true">
<t:panelGrid columns="2" border="0" width="305" cellpadding="0" cellspacing="0">
<t:panelGrid cellpadding="0" cellspacing="0">
<t:outputText value="Browse LAN" style="font-size: 12px; font-weight: bold" />
<br />
<t:outputText value="Select a netwrok share from the LAN" style="font-size: 12px;"/>
</t:panelGrid>
<t:panelGrid cellpadding="0" cellspacing="0" align="right">
<t:graphicImage alt=""
value="/images/header/gridbank/png/gridbank_64.png"
align="right" />
</t:panelGrid>
</t:panelGrid>
</a4j:outputPanel>
<t:panelGrid width="310px" cellpadding="0" cellspacing="0" style="background-color: #F0F0F0; height: 205; margin-top: 5px;" >
<t:panelGrid columns="3" style="background-color: white; height: 200;" width="308" cellpadding="0" cellspacing="0">
<t:panelGrid cellpadding="0" cellspacing="0">
<rich:panel style="height: 195px; width: 304px; overflow: auto;">
<t:tree2 value="#{mainBind.customWizard.lanBrowser.treeNode}"
var="node" binding="#{mainBind.customWizard.lanBrowser.tree}"
varNodeToggler="t" >
<f:facet name="en">
<h:panelGroup>
<f:facet name="expand">
<t:graphicImage
value="../images/GridBank/Folders/grid_network/png/grid_network_16.png"
rendered="#{t.nodeExpanded}" border="0" />
</f:facet>
<f:facet name="collapse">
<t:graphicImage
value="../images/GridBank/Folders/grid_network/png/grid_network_16.png"
rendered="#{!t.nodeExpanded}" border="0" />
</f:facet>
<h:outputText value="#{node.description}" styleClass="nodeFolder" />
</h:panelGroup>
</f:facet>
<f:facet name="pn">
<h:panelGroup>
<f:facet name="expand">
<t:graphicImage value="../images/GridBank/lan/Globe.png"
rendered="#{t.nodeExpanded}" border="0" />
</f:facet>
<f:facet name="collapse">
<t:graphicImage value="../images/GridBank/lan/Globe.png"
rendered="#{!t.nodeExpanded}" border="0" />
</f:facet>
<h:outputText value="#{node.description}" styleClass="nodeFolder" />
</h:panelGroup>
</f:facet>
<f:facet name="domain">
<h:panelGroup>
<f:facet name="expand">
<t:graphicImage value="../images/GridBank/lan/group.png"
rendered="#{t.nodeExpanded}" border="0" />
</f:facet>
<f:facet name="collapse">
<t:graphicImage value="../images/GridBank/lan/group.png"
rendered="#{!t.nodeExpanded}" border="0" />
</f:facet>
<h:outputText value="#{node.description}" styleClass="nodeFolder" />
</h:panelGroup>
</f:facet>
<f:facet name="system">
<h:panelGroup>
<f:facet name="expand">
<t:graphicImage value="../images/GridBank/lan/PC.png"
rendered="#{t.nodeExpanded}" border="0" />
</f:facet>
<f:facet name="collapse">
<t:graphicImage value="../images/GridBank/lan/PC.png"
rendered="#{!t.nodeExpanded}" border="0" />
</f:facet>
<a4j:commandLink value="#{node.description}"
styleClass="nodeFolder"
action="#{mainBind.customWizard.lanBrowser.treeNodeClick}"
oncomplete="Richfaces.showModalPanel('lanLoginDialog');"
reRender="lanLoginDialog" />
</h:panelGroup>
</f:facet>
<f:facet name="folder">
<h:panelGroup>
<f:facet name="expand">
<t:graphicImage value="../images/GridBank/lan/PC.png"
rendered="#{t.nodeExpanded}" border="0" />
</f:facet>
<f:facet name="collapse">
<t:graphicImage value="../images/GridBank/lan/PC.png"
rendered="#{!t.nodeExpanded}" border="0" />
</f:facet>
<a4j:commandLink value="#{node.description}"
styleClass="nodeFolder"
action="#{mainBind.customWizard.lanBrowser.folderNodeClick}"
oncomplete="Richfaces.hideModalPanel('lanBrowser');"
reRender="hostDetailsPanel" />
</h:panelGroup>
</f:facet>
</t:tree2>
</rich:panel>
</t:panelGrid>
</t:panelGrid>
<t:panelGrid align="right" border="0" style="margin-top: 10px;">
<a4j:commandButton value="Cancel" type="button"
onclick="Richfaces.hideModalPanel('lanBrowser');"
reRender="panelConfigureHostWizard" styleClass="CommandButton"></a4j:commandButton>
</t:panelGrid>
</t:panelGrid>
First Time Page loads but on a action i am rerendering the same page but it gives this exception ?