Wireld 500 Internal Server Error in my JSP page

My JSP page (maed by ADF) works good for about one week but after that it gives error:
500 Internal Server Error
javax.faces.el.EvaluationException: javax.faces.FacesException: javax.faces.FacesException: Can't instantiate class: 'invoiceEntry'.. class invoiceEntry : java.lang.NullPointerException
Would some one help tell me what the issue could be?
Here is the whole error message:
500 Internal Server Error
javax.faces.el.EvaluationException: javax.faces.FacesException: javax.faces.FacesException: Can't instantiate class: 'invoiceEntry'.. class invoiceEntry : java.lang.NullPointerException     at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:206)     at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:154)     at oracle.adf.view.faces.bean.FacesBeanImpl.getProperty(FacesBeanImpl.java:55)     at oracle.adfinternal.view.faces.renderkit.core.xhtml.ValueRenderer.getValue(ValueRenderer.java:63)     at oracle.adfinternal.view.faces.renderkit.core.xhtml.ValueRenderer.getConvertedString(ValueRenderer.java:32)     at oracle.adfinternal.view.faces.renderkit.core.xhtml.OutputTextRenderer.encodeEnd(OutputTextRenderer.java:56)     at oracle.adfinternal.view.faces.renderkit.core.CoreRenderer.encodeEnd(CoreRenderer.java:163)     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.CoreRenderer.encodeAllChildren(CoreRenderer.java:255)     at oracle.adfinternal.view.faces.renderkit.core.xhtml.PanelLabelAndMessageRenderer.renderFieldCellContents(PanelLabelAndMessageRenderer.java:59)     at oracle.adfinternal.view.faces.renderkit.core.xhtml.LabelAndMessageRenderer._renderFieldCell(LabelAndMessageRenderer.java:293)     at oracle.adfinternal.view.faces.renderkit.core.xhtml.LabelAndMessageRenderer.encodeAll(LabelAndMessageRenderer.java:163)     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.renderIndexedChild(BaseRenderer.java:330)     at oracle.adfinternal.view.faces.ui.BaseRenderer.renderIndexedChild(BaseRenderer.java:222)     at oracle.adfinternal.view.faces.ui.BaseRenderer.renderContent(BaseRenderer.java:129)     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.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.laf.base.xhtml.RowLayoutRenderer.renderChild(RowLayoutRenderer.java:95)     at oracle.adfinternal.view.faces.ui.BaseRenderer.renderIndexedChild(BaseRenderer.java:330)     at oracle.adfinternal.view.faces.ui.BaseRenderer.renderIndexedChild(BaseRenderer.java:222)     at oracle.adfinternal.view.faces.ui.BaseRenderer.renderContent(BaseRenderer.java:129)     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.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.renderIndexedChild(BaseRenderer.java:330)     at oracle.adfinternal.view.faces.ui.BaseRenderer.renderIndexedChild(BaseRenderer.java:222)     at oracle.adfinternal.view.faces.ui.BaseRenderer.renderContent(BaseRenderer.java:129)     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.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.composite.ContextPoppingUINode$ContextPoppingRenderer.render(ContextPoppingUINode.java:224)     at oracle.adfinternal.view.faces.ui.BaseUINode.render(BaseUINode.java:346)     at oracle.adfinternal.view.faces.ui.BaseUINode.render(BaseUINode.java:301)     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.desktop.PageHeaderLayoutRenderer._renderTabBar(PageHeaderLayoutRenderer.java:570)     at oracle.adfinternal.view.faces.ui.laf.base.desktop.PageHeaderLayoutRenderer.renderContent(PageHeaderLayoutRenderer.java:429)     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.ui.BaseUINode.render(BaseUINode.java:346)     at oracle.adfinternal.view.faces.ui.BaseUINode.render(BaseUINode.java:301)     at oracle.adfinternal.view.faces.ui.BaseRenderer.renderChild(BaseRenderer.java:412)     at oracle.adfinternal.view.faces.ui.BaseRenderer.renderIndexedChild(BaseRenderer.java:330)     at oracle.adfinternal.view.faces.ui.BaseRenderer.renderIndexedChild(BaseRenderer.java:222)     at oracle.adfinternal.view.faces.ui.BaseRenderer.renderContent(BaseRenderer.java:129)     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.ui.BaseUINode.render(BaseUINode.java:346)     at oracle.adfinternal.view.faces.ui.BaseUINode.render(BaseUINode.java:301)     at oracle.adfinternal.view.faces.ui.composite.UINodeRenderer.renderWithNode(UINodeRenderer.java:90)     at oracle.adfinternal.view.faces.ui.composite.UINodeRenderer.render(UINodeRenderer.java:36)     at oracle.adfinternal.view.faces.ui.laf.oracle.desktop.PageLayoutRenderer.render(PageLayoutRenderer.java:76)     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 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 invoiceEntryNew.jspService(_invoiceEntryNew.java:3702)     [SRC:/invoiceEntryNew.jsp:669]     at com.orionserver[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].http.OrionHttpJspPage.service(OrionHttpJspPage.java:56)     at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:350)     at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:509)     at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:413)     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)     at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:824)     at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:330)     at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.ServletRequestDispatcher.forward(ServletRequestDispatcher.java:253)     at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)     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.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65)     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 com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:16)     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:332)     at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:20)     at Session.ApplicationSessionExpiryFilter.doFilter(ApplicationSessionExpiryFilter.java:50)     at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:659)     at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:330)     at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:830)     at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.AJPRequestHandler.run(AJPRequestHandler.java:224)     at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.AJPRequestHandler.run(AJPRequestHandler.java:133)     at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)     at java.lang.Thread.run(Thread.java:534)Caused by: javax.faces.FacesException: javax.faces.FacesException: Can't instantiate class: 'invoiceEntry'.. class invoiceEntry : java.lang.NullPointerException     at com.sun.faces.application.ApplicationAssociate.createAndMaybeStoreManagedBeans(ApplicationAssociate.java:266)     at com.sun.faces.el.VariableResolverImpl.resolveVariable(VariableResolverImpl.java:78)     at oracle.adfinternal.view.faces.el.AdfFacesVariableResolver.resolveVariable(AdfFacesVariableResolver.java:40)     at oracle.adfinternal.view.faces.model.VariableResolverUtils$JspResolver.resolveVariable(VariableResolverUtils.java:79)     at com.sun.faces.el.impl.NamedValue.evaluate(NamedValue.java:125)     at com.sun.faces.el.impl.ComplexValue.evaluate(ComplexValue.java:146)     at com.sun.faces.el.impl.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:243)     at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:173)     ... 114 moreCaused by: javax.faces.FacesException: Can't instantiate class: 'invoiceEntry'.. class invoiceEntry : java.lang.NullPointerException     at com.sun.faces.config.ManagedBeanFactory.newInstance(ManagedBeanFactory.java:209)     at com.sun.faces.application.ApplicationAssociate.createAndMaybeStoreManagedBeans(ApplicationAssociate.java:256)     ... 121 moreCaused by: java.lang.ClassNotFoundException: class invoiceEntry : java.lang.NullPointerException     at java.beans.Beans.instantiate(Beans.java:208)     at java.beans.Beans.instantiate(Beans.java:48)     at com.sun.faces.config.ManagedBeanFactory.newInstance(ManagedBeanFactory.java:203)     ... 122 more

Looks like a NPE in your invoiceEntry class - I cannot tell for sure is that a managed bean or a jsp tag. My guess would be that the NPE is in that class' constructor... time to get out the debugger.
John

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