java.lang.NullPointerException at org.primefaces.model.chart.BarChartModel.getTicks - jsf

Question

I am using Tomcat7 and when I run my server I get this error. I wasn't getting this error it was working fine but all of a sudden this error came up. Web page shows up this error comes up only when I submit the form in the page.
java.lang.NullPointerException
at org.primefaces.model.chart.BarChartModel.getTicks(BarChartModel.java:82)
at org.primefaces.component.chart.renderer.BarRenderer.encodeOptions(BarRenderer.java:81)
at org.primefaces.component.chart.renderer.BasePlotRenderer.render(BasePlotRenderer.java:30)
at org.primefaces.component.chart.ChartRenderer.encodeScript(ChartRenderer.java:98)
at org.primefaces.component.chart.ChartRenderer.encodeEnd(ChartRenderer.java:67)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:924)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
at org.richfaces.renderkit.RendererBase.renderChildren(RendererBase.java:282)
at org.richfaces.renderkit.html.TogglePanelItemRenderer.doEncodeChildren(TogglePanelItemRenderer.java:140)
at org.richfaces.renderkit.html.TabRenderer.doEncodeChildren(TabRenderer.java:113)
at org.richfaces.renderkit.RendererBase.encodeChildren(RendererBase.java:158)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:894)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at org.richfaces.renderkit.RendererBase.renderChildren(RendererBase.java:282)
at org.richfaces.renderkit.html.TogglePanelRenderer.doEncodeChildren(TogglePanelRenderer.java:129)
at org.richfaces.renderkit.RendererBase.encodeChildren(RendererBase.java:158)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:894)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:304)
at com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:114)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:894)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:458)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:134)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)

Answer 1

After debugging the error I found out that I had used a variable of BarChartModel but accidentally deleted the line where I had set it.

Answer 2

java.lang.NullPointerException
at org.primefaces.model.chart.BarChartModel.getTicks(BarChartModel.java:82
because in your BarChartModel:-
if you are using Map and set the key/value like this:
map.set(key, value);
so, key cannot be null.