(JSF) newbie null reference exception
error:
javax.faces.FacesException: #{Login.ValidateLogin}: java.lang.NullPointerException
I am a Java web development scrub / newbie. I am assuming this is because i did not have an instance of the Login class. However, tutorials that i have seen have done similar tasks without creating an instance (and they are not static classes) so i am confused. Please help me understand why i am getting this error and how to make this simple web application work. Thanks in advance.
faces configuration:
<faces-config>
<managed-bean>
<managed-bean-name>Login</managed-bean-name>
<managed-bean-class>Security.Login</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
<navigation-rule>
<from-view-id>/Login.jsf</from-view-id>
<navigation-case>
<from-action>#{Login.ValidateLogin}</from-action>
<from-outcome>success</from-outcome>
<to-view-id>LoginValid.jsf</to-view-id>
</navigation-case>
<navigation-case>
<from-action>#{Login.ValidateLogin}</from-action>
<from-outcome>fail</from-outcome>
<to-view-id>LoginInvalid.jsf</to-view-id>
</navigation-case>
</navigation-rule>
</faces-config>
web.xml file:
<context-param>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>server</param-value>
</context-param>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
Login.jsp/jsf whatever:
<f:view>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>JSP Page</title>
</head>
<body>
<h:form>
<table>
<tr>
<td><h:outputText value="Username: "/></td>
<td><h:inputText id="username" value="#{Login.username}" /></td>
</tr>
<tr>
<td><h:outputText value="Password: "/></td>
<td><h:inputSecret id="password" value="#{Login.password}" /></td>
</tr>
<tr>
<td> </td>
<td><h:commandButton value="login" action="#{Login.ValidateLogin}" /></td>
</tr>
</table>
</h:form>
</body>
</html>
</f:view>
Login class definition:
package Security;
public class Login {
private String username;
private String password;
public Login() {} // Inline Constructor for Login class
public String getUsername() { return username; }
public String getPassword() { return password; }
public void setUsername(String username) { this.username = username; }
public void setPassword(String password) { this.password = password; }
public String ValidateLogin() {
if(username.equals("ianmcdavid") && password.equals("cole")) {
return "success";
else {
return "fail";
}
you are apparently also a Java "newbie", otherwise you would have posted/searched for your best friend in the world: the exception stacktrace. I hope you realize that learning Java web development is a frustrating and confusing thing to do if you don't know proper core Java.
Lets use some good old fashioned reasoning. See this code:
if(username.equals("ianmcdavid") && password.equals("cole")) {
return "success";
}When the class is created, username and password will be null. Might that perhaps be the cause of the NullPointerException?
Try this in stead:
if("ianmcdavid".equals(username) && "cole".equals(password)) {
return "success";
}That won't ever cause an NPE while still providing the same functionality.
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<af:tree value="#{bindings.listToDoAppsVO1.treeModel}" summary="ToDo List Tree" var="node"
id="pt_t8" contentDelivery="lazy"
initiallyExpanded="true"
styleClass="AFStretchWidth" inlineStyle="height:inherit;">
<f:facet name="nodeStamp">
<af:switcher facetName="#{node.hierType.structureDefName}" id="todo_switcher">
<!-- render the Application Node -->
<f:facet name="app_model.listToDoAppsVO">
<!-- display the Application as the node name -->
<af:outputText value="#{node.Appname}" id="ot_app">
</af:outputText>
</f:facet>
<f:facet name="app_model.listToDoTypesVO">
<!-- Create the node definition for the Report Type -->
<af:commandImageLink id="pt_ot16"
text="#{node.Viewtype}"
icon="/pics/folder-icon.png"
action="callRouter"
actionListener="#{backingBeanScope.cognition3coltempBacking.toDoViewGoActionListener}"
/>
</f:facet>
</af:switcher>
</f:facet>
</af:tree>However, when the page is run the Tree displays correctly initially, but as soon as a link is pressed I get a Null Pointer exception with the following Stack Trace info (top 30 or so lines):
java.lang.NullPointerException
at oracle.jbo.uicli.binding.JUCtrlValueBinding.createAndNotifyDCE(JUCtrlValueBinding.java:327)
at oracle.jbo.uicli.binding.JUCtrlHierNodeBinding.createAndNotifyDCE(JUCtrlHierNodeBinding.java:2646)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlHierNodeBinding.createAndNotifyDCE(FacesCtrlHierNodeBinding.java:137)
at oracle.jbo.uicli.binding.JUCtrlValueBinding.notifyRefreshDCE(JUCtrlValueBinding.java:299)
at oracle.jbo.uicli.binding.JUIteratorBinding.notifyRefreshDCE(JUIteratorBinding.java:497)
at oracle.adf.model.binding.DCIteratorBinding.refreshControlAndNotifyDCE(DCIteratorBinding.java:705)
at oracle.adf.model.binding.DCIteratorBinding.rangeRefreshed(DCIteratorBinding.java:914)
at oracle.adf.model.binding.DCIteratorBinding.iteratorReset(DCIteratorBinding.java:1332)
at oracle.jbo.common.RowSetHelper.fireMgmtIteratorReset(RowSetHelper.java:282)
at oracle.jbo.server.ViewRowSetIteratorImpl.notifyIteratorReset(ViewRowSetIteratorImpl.java:3778)
at oracle.jbo.server.ViewRowSetImpl.resetIterators(ViewRowSetImpl.java:4004)
at oracle.jbo.server.ViewRowSetImpl.execute(ViewRowSetImpl.java:1271)
at oracle.jbo.server.ViewRowSetImpl.executeQueryForMasters(ViewRowSetImpl.java:1413)
at oracle.jbo.server.ViewRowSetImpl.executeQueryForMode(ViewRowSetImpl.java:1319)
at oracle.jbo.server.ViewRowSetImpl.executeQuery(ViewRowSetImpl.java:1304)
at oracle.jbo.server.ViewObjectImpl.executeQuery(ViewObjectImpl.java:7119)
at oracle.adf.model.bc4j.DCJboDataControl.executeIteratorBindingIfNeeded(DCJboDataControl.java:1366)
at oracle.adf.model.binding.DCIteratorBinding.executeQueryIfNeeded(DCIteratorBinding.java:2219)
at oracle.jbo.uicli.binding.JUCtrlHierBinding.getRootNodeBinding(JUCtrlHierBinding.java:92)
at oracle.adfinternal.view.faces.model.binding.RowDataManager.getParent(RowDataManager.java:245)
at oracle.adfinternal.view.faces.model.binding.RowDataManager.setRowIndex(RowDataManager.java:51)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlHierBinding$FacesModel.setRowIndex(FacesCtrlHierBinding.java:800)
at org.apache.myfaces.trinidad.component.UIXCollection.setRowIndex(UIXCollection.java:530)
at org.apache.myfaces.trinidad.component.UIXTree.__encodeBegin(UIXTree.java:488)
at org.apache.myfaces.trinidad.component.UIXCollection.encodeBegin(UIXCollection.java:607)If I replace the tree with a simpler component (e.g Command Image link) I don't get the error.
Any ideas please? I'm using JDeveloper 11.1.2.1.0 incidentally...
Thanks.Hi Frank,
Thanks for your reply. The Partial Submit worked up to a point - the expected navigation to the new view now works when the link is initially pressed. However, if the link is tried again the Null Pointer Exception occurs again.
By the way, the Tree is on a Page Template, where there is another Tree that utilises an af:switcher - and the command link from this tree now fails with the same NPE error. I notice there are warnings for both trees in the Page Template View such that 'Reference "node.hierType" not found'. Not sure how relevant this is given that the Trees both display correctly initially.
The Stack Trace is as follows (can't post the whole thing as it exceeds the 30000 char limit):
<UIXInclude> <_warnUnpoppedContextChanges> ADF_FACES-10021:During the processing of the include component, the context change found did not match the current component. Expected oracle.adf.view.rich.component.fragment.UIXInclude$IncludeContextChange, but got UIXCollection.CollectionComponentChange[Component class: oracle.adf.view.rich.component.rich.data.RichTree, component ID: pt_t8].
<FaceletViewHandlingStrategy> <handleRenderException> Error Rendering View[/app_todoTF/app_common_todo]
java.lang.NullPointerException
at oracle.jbo.uicli.binding.JUCtrlHierNodeBinding.findChildNode(JUCtrlHierNodeBinding.java:867)
at oracle.jbo.uicli.binding.JUCtrlHierBinding.bringNodeToRangeKeyPath(JUCtrlHierBinding.java:788)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlHierBinding.bringNodeToRangeKeyPath(FacesCtrlHierBinding.java:111)
at oracle.adfinternal.view.faces.model.binding.RowDataManager.setRowKey(RowDataManager.java:130)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlHierBinding$FacesModel.setRowKey(FacesCtrlHierBinding.java:830)
at org.apache.myfaces.trinidad.component.UIXCollection.setRowKey(UIXCollection.java:513)
at oracle.adfinternal.view.faces.renderkit.rich.TreeRendererUtils._isMultiRootedTree(TreeRendererUtils.java:2507)
at oracle.adfinternal.view.faces.renderkit.rich.TreeRendererUtils.addClientPropertyFlags(TreeRendererUtils.java:1915)
at oracle.adfinternal.view.faces.renderkit.rich.TreeRenderer.addClientProperties(TreeRenderer.java:742)
at oracle.adfinternal.view.faces.renderkit.rich.TreeRenderer.encodeAll(TreeRenderer.java:351)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at org.apache.myfaces.trinidad.component.UIXCollection.encodeEnd(UIXCollection.java:617)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
at oracle.adfinternal.view.faces.renderkit.rich.PanelBoxRenderer._encodeAllChildren(PanelBoxRenderer.java:1518)
at oracle.adfinternal.view.faces.renderkit.rich.PanelBoxRenderer._renderContentRow(PanelBoxRenderer.java:1440)
at oracle.adfinternal.view.faces.renderkit.rich.PanelBoxRenderer.encodeAll(PanelBoxRenderer.java:381)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer._encodeChild(PanelGroupLayoutRenderer.java:447)
at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer.access$1500(PanelGroupLayoutRenderer.java:30)
at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer$EncoderCallback.processComponent(PanelGroupLayoutRenderer.java:734)
at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer$EncoderCallback.processComponent(PanelGroupLayoutRenderer.java:637)
at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:187)
at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:318)
at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:283)
at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer.encodeAll(PanelGroupLayoutRenderer.java:360)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer.access$600(ShowDetailItemRenderer.java:37)
at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer$ChildEncoderCallback.processComponent(ShowDetailItemRenderer.java:640)
at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer$ChildEncoderCallback.processComponent(ShowDetailItemRenderer.java:613)
at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:187)
at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:318)
at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:283)
at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer._encodeChildren(ShowDetailItemRenderer.java:550)
at oracle.adfinternal.view.faces.renderkit.rich.ShowDetailItemRenderer.encodeAll(ShowDetailItemRenderer.java:121)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
at oracle.adfinternal.view.faces.renderkit.rich.PanelAccordionRenderer._encodeNonScreenReaderDetailItem(PanelAccordionRenderer.java:1572)
at oracle.adfinternal.view.faces.renderkit.rich.PanelAccordionRenderer._encodeDetailItem(PanelAccordionRenderer.java:1638)
at oracle.adfinternal.view.faces.renderkit.rich.PanelAccordionRenderer.access$4900(PanelAccordionRenderer.java:58)
at oracle.adfinternal.view.faces.renderkit.rich.PanelAccordionRenderer$PanelEncoderCallback.processComponent(PanelAccordionRenderer.java:2775)
at oracle.adfinternal.view.faces.renderkit.rich.PanelAccordionRenderer$PanelEncoderCallback.processComponent(PanelAccordionRenderer.java:2719)
at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:187)
at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:318)
at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:283)
at oracle.adfinternal.view.faces.renderkit.rich.PanelAccordionRenderer.encodeAll(PanelAccordionRenderer.java:471)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeStartFacet(PanelStretchLayoutRenderer.java:942)
at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeVerticalPane(PanelStretchLayoutRenderer.java:1542)
at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeMiddlePanes(PanelStretchLayoutRenderer.java:350)
at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeAll(PanelStretchLayoutRenderer.java:316)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer._renderPane(PanelSplitterRenderer.java:1593)
at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer.encodeAll(PanelSplitterRenderer.java:263)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeCenterFacet(PanelStretchLayoutRenderer.java:879)
at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeCenterPane(PanelStretchLayoutRenderer.java:1294)
at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeMiddlePanes(PanelStretchLayoutRenderer.java:351)
at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeAll(PanelStretchLayoutRenderer.java:316)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer._renderPane(PanelSplitterRenderer.java:1593)
at oracle.adfinternal.view.faces.renderkit.rich.PanelSplitterRenderer.encodeAll(PanelSplitterRenderer.java:263)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
at oracle.adfinternal.view.faces.renderkit.rich.PageTemplateRenderer.encodeAll(PageTemplateRenderer.java:68)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
at oracle.adfinternal.view.faces.renderkit.rich.FormRenderer.encodeAll(FormRenderer.java:274)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
at oracle.adfinternal.view.faces.renderkit.rich.DocumentRenderer.encodeAll(DocumentRenderer.java:1277)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at oracle.adfinternal.view.faces.context.PartialViewContextImpl._processRender(PartialViewContextImpl.java:321)
at oracle.adfinternal.view.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:152)
at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:974)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1652)
at oracle.adfinternal.view.faces.component.AdfViewRoot.encodeAll(AdfViewRoot.java:91)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:399)
at org.apache.myfaces.trinidadinternal.application.ViewDeclarationLanguageFactoryImpl$ChangeApplyingVDLWrapper.renderView(ViewDeclarationLanguageFactoryImpl.java:350)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:273)
at org.apache.myfaces.trinidadinternal.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:165)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._renderResponse(LifecycleImpl.java:1027)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:334)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:232)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:173)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:122)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)
at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:293)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:199)
at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)
at java.security.AccessController.doPrivileged(Native Method)
at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)
at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)
at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
<LifecycleImpl> <_handleException> ADF_FACES-60098:Faces lifecycle receives unhandled exceptions in phase RENDER_RESPONSE 6
java.lang.NullPointerException
etc...Thanks. -
Really frustrating Null Pointer Exception
Hi I had the day off and was bored so I decided to start work on a poker game. Today I just started making a deck of cards and drawing a random card from it. However it isn't working as I get a very annoying null pointer exception which I don't understand. Anyway I will post my code:
public class DeckOfCards
public static void main(String args[])
Deck daDeck = new Deck();
Card[] drawnCards = new Card[10];
for (int i=0; i < 10; ++i)
drawnCards[i] = daDeck.DrawCard();
System.out.println(drawnCards.getTitle());
import java.util.*;
public class Deck
Suit Hearts;
Suit Diamonds;
Suit Spades;
Suit Clubs;
public void Deck()
Hearts = new Suit("Hearts");
Diamonds = new Suit("Diamonds");
Spades = new Suit("Spades");
Clubs = new Suit("Clubs");
public Card DrawCard()
System.out.println("Drawing card...");
Random generator = new Random();
Card card = null;
System.out.println("Card variable inited");
while (card == null)
System.out.println("Bleep");
switch (generator.nextInt(4))
case 0:
System.out.println("0");
return Hearts.getAvailableCard();
case 1:
System.out.println("1");
return Diamonds.getAvailableCard();
case 2:
System.out.println("2");
return Spades.getAvailableCard();
case 3:
System.out.println("3");
return Clubs.getAvailableCard();
default:
System.out.println("none");
System.out.println("Exited while loop");
return card;
import java.util.*;
public class Suit
Card[] cards = new Card[13];
public Suit(String suit_)
cards[0] = new Card("Two", suit_);
cards[1] = new Card("Three", suit_);
cards[2] = new Card("Four", suit_);
cards[3] = new Card("Five", suit_);
cards[4] = new Card("Six", suit_);
cards[5] = new Card("Seven", suit_);
cards[6] = new Card("Eight", suit_);
cards[7] = new Card("Nine", suit_);
cards[8] = new Card("Ten", suit_);
cards[9] = new Card("Jack", suit_);
cards[10] = new Card("Queen", suit_);
cards[11] = new Card("King", suit_);
cards[12] = new Card("Ace", suit_);
public Card getAvailableCard()
System.out.println("Getting an available card...");
Random generator = new Random();
Card card = new Card();
int randomNo = generator.nextInt(13);
System.out.println(randomNo);
if (cards[randomNo].isAvailable())
return cards[randomNo];
return card;
public class Card
String strValue;
String suitName;
int value;
int suit;
boolean available = true;
public Card()
strValue = "Out";
suitName = "cards";
public Card(String strValue_, String suitName_)
strValue = strValue_;
suitName = suitName_;
public String getTitle()
String title = strValue + " of " + suitName;
return title;
public void setAvailable(boolean available_)
available = available_;
public boolean isAvailable()
return available;
What the program is meant to do is create a deck of cards, then pick ten cards, randomly picking a suit and card in that suit. If the card has already been drawn ( not available ) then the DrawCard() method should repick a suit and card and try again. The program may be doing something differently to what I have said and may be a bit messy just because I have messed around with things trying to understand why I am getting the exception. This is the exception:
Exception in thread "main" java.lang.NullPointerException
at Deck.DrawCard(Deck.java:34)
at DeckOfCards.main(DeckOfCards.java:13)
The program doesn't even make it to the first line of the getAvailableCard() method in the Suit Class.
So all I am asking is can anyone see why I am getting the null pointer exception and what action could I take to fix it. Thankyou to anyone who has read this.Figure out what's null.
Print out cards and then cards[randomNo].
If those aren't null, then you need to look more closely at the erorr message and put in print statements to find out what is.
Whatever turns out to be null, you'll need to trace back and figure out why.
If it's the array, and the array is a member variable, then you need to know that reference member variables are initilaized to null.
If the array isn't null (because you did cards = new Card[something]) but cards[randomNo] is null, then it's because you didn't do this: for (int ix = 0; ix < cards.length; ix++) {
cards[ix] = new Card(...);
} -
Null Pointer Exception with iterator
Hi,
I'm trying to use an iterator on a collection bound to a jsf page fragment through datacontrol (data is retrieved from a web service).
Everything works fine except when this collection is null; I'm then getting a null pointer exception.
Is there an equivalent of <af:table emptytext="">? Or maybe, is there somewhere where I can configure my datacontrol to always return an empty collection instead of null?
Thanks.
Edit: my mistake; I made an error in the binding, which was pointing to another iterator already used.
Edited by: 965573 on 16 oct. 2012 02:17Hi,
You can try not to render the table when the length of the Collection is zero. This can be done by a JSTL function "length" available at:
http://java.sun.com/jsp/jstl/functions
Ex:#{fn:length(bindings.Collection)>0}"
Thanks, -
Error: Dereferencing of the NULL reference
Dear Friends,
one of our user is running a report on web bex and he is getting following error.
com.sap.ip.bi.base.application.exceptions.AbortMessageRuntimeException:
Termination message sent ABEND RS_EXCEPTION (000): Dereferencing of the NULL reference
MSGV1: Dereferencing of the NULL reference
But when we run this with our user we are not getting any error.
if we run this report using RSRT usin user's user id it is not giving any error.
only genrating error when we try to run using Web Bex .
Any help hightly Appicated.
MalikThanks friends,
i already check the given sap note but that note is for support pack till17 and we have already 19 support level.
thats why this is not the solution.
second i check it publishing. its working fine with all the users except 3 of our users. i dont know why the error is
comming with them only.
and i also check the url no specific variable values.
any other idea.
regards
Naeem
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