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Servlet exception that caused a "White Screen" on the browser  RSS feed

 
Greenhorn
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Hi,

I am encountering a issue of getting a white screen on the browser. This problem can't be re-produced but it does happen from time to time. When it happens, it gets more and more often and at the end I have to restart the application. However, it come back after a while.

I found the exception on the log as below. Does anyone have a clue on what could be the cause of the problem?

Any help is greatly appreciated.

-Raymond

[12/21/10 11:15:53:606 EST] 000000a1 ServletWrappe E SRVE0068E: Uncaught exception thrown in one of the service methods of the servlet: /welcome.jspx. Exception thrown : java.lang.NullPointerException
at oracle.adfinternal.view.faces.renderkit.core.xhtml.table.TableRenderingContext.getRenderStage(TableRenderingContext.java:104)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.ObjectImageRenderer.getAlign(ObjectImageRenderer.java:110)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.ObjectImageRenderer.renderAllAttributes(ObjectImageRenderer.java:69)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.ObjectImageRenderer.encodeBegin(ObjectImageRenderer.java:50)
at oracle.adfinternal.view.faces.renderkit.core.CoreRenderer.encodeBegin(CoreRenderer.java:139)
at oracle.adf.view.faces.component.UIXComponentBase.encodeBegin(UIXComponentBase.java:593)
at oracle.adfinternal.view.faces.renderkit.core.CoreRenderer.encodeChild(CoreRenderer.java:221)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.PanelGroupRenderer._encodeChild(PanelGroupRenderer.java:142)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.PanelGroupRenderer._encodeChildren(PanelGroupRenderer.java:124)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.PanelGroupRenderer.encodeAll(PanelGroupRenderer.java:72)
at oracle.adfinternal.view.faces.renderkit.core.CoreRenderer.encodeEnd(CoreRenderer.java:159)
at oracle.adf.view.faces.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:624)
at oracle.adfinternal.view.faces.renderkit.core.CoreRenderer.encodeChild(CoreRenderer.java:236)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.PanelGroupRenderer._encodeChild(PanelGroupRenderer.java:147)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.PanelGroupRenderer._encodeChildren(PanelGroupRenderer.java:124)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.PanelGroupRenderer.encodeAll(PanelGroupRenderer.java:72)
at oracle.adfinternal.view.faces.renderkit.core.CoreRenderer.encodeEnd(CoreRenderer.java:159)
at oracle.adf.view.faces.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:624)
at oracle.adfinternal.view.faces.uinode.UIComponentUINode._renderComponent(UIComponentUINode.java:317)
at oracle.adfinternal.view.faces.uinode.UIComponentUINode.render(UIComponentUINode.java:262)
at oracle.adfinternal.view.faces.uinode.UIComponentUINode.render(UIComponentUINode.java:239)
at oracle.adfinternal.view.faces.ui.BaseRenderer.renderChild(BaseRenderer.java:412)
at oracle.adfinternal.view.faces.ui.BaseRenderer.renderNamedChild(BaseRenderer.java:384)
at oracle.adfinternal.view.faces.ui.laf.base.xhtml.BorderLayoutRenderer._renderTableContent(BorderLayoutRenderer.java:101)
at oracle.adfinternal.view.faces.ui.laf.base.xhtml.BorderLayoutRenderer.renderContent(BorderLayoutRenderer.java:59)
at oracle.adfinternal.view.faces.ui.BaseRenderer.render(BaseRenderer.java:81)
at oracle.adfinternal.view.faces.ui.laf.base.xhtml.XhtmlLafRenderer.render(XhtmlLafRenderer.java:67)
at oracle.adfinternal.view.faces.uinode.UIXComponentUINode.renderInternal(UIXComponentUINode.java:177)
at oracle.adfinternal.view.faces.uinode.UINodeRendererBase.encodeEnd(UINodeRendererBase.java:53)
at oracle.adf.view.faces.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:624)
at oracle.adfinternal.view.faces.renderkit.RenderUtils.encodeRecursive(RenderUtils.java:54)
at oracle.adfinternal.view.faces.renderkit.RenderUtils.encodeRecursive(RenderUtils.java:50)
at oracle.adfinternal.view.faces.renderkit.core.CoreRenderer.encodeChild(CoreRenderer.java:232)
at oracle.adfinternal.view.faces.renderkit.core.CoreRenderer.encodeAllChildren(CoreRenderer.java:255)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.PanelPartialRootRenderer.renderContent(PanelPartialRootRenderer.java:65)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.BodyRenderer.renderContent(BodyRenderer.java:117)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.PanelPartialRootRenderer.encodeAll(PanelPartialRootRenderer.java:147)
at oracle.adfinternal.view.faces.renderkit.core.xhtml.BodyRenderer.encodeAll(BodyRenderer.java:60)
at oracle.adfinternal.view.faces.renderkit.core.CoreRenderer.encodeEnd(CoreRenderer.java:159)
at oracle.adf.view.faces.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:624)
at javax.faces.webapp.UIComponentTag.encodeEnd(UIComponentTag.java:623)
at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:546)
at oracle.adf.view.faces.webapp.UIXComponentTag.doEndTag(UIXComponentTag.java:100)
at com.ibm._jsp._welcome_5F_jspx._jspx_meth_afh_body_0(_welcome_5F_jspx.java:274)
at com.ibm._jsp._welcome_5F_jspx._jspx_meth_afh_html_0(_welcome_5F_jspx.java:296)
at com.ibm._jsp._welcome_5F_jspx._jspx_meth_f_view_0(_welcome_5F_jspx.java:322)
at com.ibm._jsp._welcome_5F_jspx._jspService(_welcome_5F_jspx.java:66)
at com.ibm.ws.jsp.runtime.HttpJspBase.service(HttpJspBase.java:87)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1146)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1087)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:145)
at ca.on.gov.csc.ahp.web.filters.SessionCheckFilter.doFilter(SessionCheckFilter.java:96)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:130)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:87)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:848)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:691)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:588)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:525)
at com.ibm.wsspi.webcontainer.servlet.GenericServletWrapper.handleRequest(GenericServletWrapper.java:122)
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.handleRequest(AbstractJSPExtensionServletWrapper.java:232)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:321)
at com.ibm.faces.context.MultipartExternalContextImpl.dispatch(MultipartExternalContextImpl.java:411)
at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)
at oracle.adfinternal.view.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:157)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1146)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1087)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:145)
at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._invokeDoFilter(AdfFacesFilterImpl.java:367)
at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._doFilterImpl(AdfFacesFilterImpl.java:336)
at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl.doFilter(AdfFacesFilterImpl.java:196)
at oracle.adf.view.faces.webapp.AdfFacesFilter.doFilter(AdfFacesFilter.java:87)
at ca.on.gov.csc.ahp.common.AimsAdfFacesFilter.doFilter(AimsAdfFacesFilter.java:30)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:130)
at ca.on.gov.csc.ahp.web.filters.SessionCheckFilter.doFilter(SessionCheckFilter.java:96)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:130)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:87)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:848)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:691)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:588)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:525)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:90)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:764)
at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1478)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:133)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:458)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:387)
at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:102)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:196)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:751)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:881)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497)
 
It is sorta covered in the JavaRanch Style Guide.
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