Can you paste the stacktrace. It would be more helpful to know where exactly is the nullpointer exception happening..
It might not be the component's fault. This is the behaviour I was experiencing with myfaces 1.09 , might be something similar in your case. I had a bunch of different radio buttons in a datatable, all disconnected and having an individual selectOneRadio. For each radio that was not selected, myfaces was setting the corresponding backing bean value to null. And my application was crashing because if some earlier radio button was clicked, but not a later one, then the end result would be a null value in the backing bean due to the later radio button. Hope this helps.. Rahul -----Original Message----- From: steve rock [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 17, 2005 3:55 PM To: MyFaces Discussion Subject: Re: h:selectManyCheckbox throwing NullPointerException when none selected. Why? Second request. Stopping me from implementing a new feature in production. I basically have a list of checkboxes on a form that throws an error if none of them are selected. I need to be able to not have to select any checkboxes. Any ideas? -Steve On 8/14/05, steve rock <[EMAIL PROTECTED]> wrote: > Here's my component. > > <h:selectManyCheckbox id="stationFeatures" layout="pageDirection" > value="#{userTool.newUserFeatures}" > > <f:selectItems value="#{userTool.featureSelectItems}"/> > </h:selectManyCheckbox> > > It presents a list of radio stations a user can select. However as > part of the business requirements they can have none selected. When I > select none and submit the form, I get a NullPointerException. How > come? > > > Here is the stack trace: > > java.lang.NullPointerException > at org.apache.myfaces.renderkit._SharedRendererUtils.getConvertedUISelectManyVa lue(_SharedRendererUtils.java:118) > at org.apache.myfaces.renderkit.RendererUtils.getConvertedUISelectManyValue(Ren dererUtils.java:792) > at org.apache.myfaces.renderkit.html.HtmlCheckboxRendererBase.getConvertedValue (HtmlCheckboxRendererBase.java:260) > at javax.faces.component.UISelectMany.getConvertedValue(UISelectMany.java:295) > at javax.faces.component.UIInput.validate(UIInput.java:291) > at javax.faces.component.UISelectMany.validate(UISelectMany.java:284) > at javax.faces.component.UIInput.processValidators(UIInput.java:166) > at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java :427) > at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java :427) > at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java :427) > at javax.faces.component.UIForm.processValidators(UIForm.java:66) > at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java :427) > at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:162) > at org.apache.myfaces.lifecycle.LifecycleImpl.processValidations(LifecycleImpl. java:208) > at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:92) > at javax.faces.webapp.FacesServlet.service(FacesServlet.java:109) > at org.apache.myfaces.webapp.MyFacesServlet.service(MyFacesServlet.java:70) > at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:237) > at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:157) > at com.m2g.stationtools.web.filters.StationToolsRequestContextFilter.doFilter(S tationToolsRequestContextFilter.java:49) > at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:186) > at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:157) > at org.apache.myfaces.component.html.util.ExtensionsFilter.doFilter(ExtensionsF ilter.java:112) > at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:186) > at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:157) > at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:214) > at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex t.java:104) > at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) > at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContext Valve.java:198) > at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:152) > at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex t.java:104) > at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssoci ationValve.java:72) > at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex t.java:102) > at org.jboss.web.tomcat.security.JBossSecurityMgrRealm.invoke(JBossSecurityMgrR ealm.java:275) > at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex t.java:102) > at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase .java:540) > at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex t.java:102) > at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) > at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137 ) > at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex t.java:104) > at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117 ) > at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex t.java:102) > at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) > at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :109) > at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContex t.java:104) > at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) > at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929) > at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160) > at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799) > at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:705) > at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577) > at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:683) > at java.lang.Thread.run(Thread.java:534) >
