The exception i'm getting is : Caused by: java.lang.NullPointerException at org.ajax4jsf.renderkit.AjaxRendererUtils.buildEventOptions(AjaxRendererUtils.java:267) at org.ajax4jsf.renderkit.AjaxRendererUtils.buildEventOptions(AjaxRendererUtils.java:251) at org.ajax4jsf.renderkit.AjaxRendererUtils.buildOnEvent(AjaxRendererUtils.java:220) at org.ajax4jsf.renderkit.AjaxRendererUtils.buildOnClick(AjaxRendererUtils.java:165) at org.ajax4jsf.renderkit.AjaxCommandRendererBase.getOnClick(AjaxCommandRendererBase.java:83) at org.ajax4jsf.renderkit.html.CommandButtonRenderer.doEncodeEnd(CommandButtonRenderer.java:115) at org.ajax4jsf.renderkit.html.CommandButtonRenderer.doEncodeEnd(CommandButtonRenderer.java:162) at org.ajax4jsf.renderkit.RendererBase.encodeEnd(RendererBase.java:134) at com.ibm.faces.renderkit.DefaultAjaxRenderer.encodeEnd(DefaultAjaxRenderer.java:83) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:850) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:946) at javax.faces.render.Renderer.encodeChildren(Renderer.java:148) at com.ibm.faces.renderkit.DefaultAjaxRenderer.encodeChildren(DefaultAjaxRenderer.java:73) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:826) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:936) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:942) at com.sun.faces.application.ViewHandlerImpl.doRenderView(ViewHandlerImpl.java:289) at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:220) at com.ibm.faces.portlet.PortletViewHandlerImpl.renderView(PortletViewHandlerImpl.java:79) at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100) at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:179) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) at com.ibm.faces.portlet.FacesPortlet.doRender(FacesPortlet.java:374) ... 175 more