For the past 2 days I have tried to create a simple dataTable but all I get is a NullPointerException. I stripped the code down to the bare minimum and now have:
LOMenu.jsp: ----------- <%@ taglib uri="http://java.sun.com/jsf/html"; prefix="h" %> <%@ taglib uri="http://java.sun.com/jsf/core"; prefix="f" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <f:view> <f:loadBundle basename="ca.gc.nrc.iit.toml.frontend.bundles.LOMenu" var="MessageBundle"/> <html> <head> <link href="css/stylesheet.css" rel="stylesheet" type="text/css"/> <title> <h:outputText value="#{MessageBundle.dialogtitle}" /> </title> </head> <body> <h:form id="LOMenuForm"> <h:outputText value="#{MessageBundle.dialogtitle}" /> <h:dataTable value="#{bookListBean.books}" var="book" border="1"> <h:column> <h:outputText value="#{book.classificationSystemName}" /> </h:column> </h:dataTable> </h:form> </body> </html> </f:view> The relevant pieces of faces-config are: ----------------------------------------- <managed-bean> <managed-bean-name>bookListBean</managed-bean-name> <managed-bean-class>ca.gc.nrc.iit.toml.frontend.LOMenuBackingBean</managed-b ean-class> <managed-bean-scope>session</managed-bean-scope> </managed-bean> <managed-bean> <managed-bean-name>book</managed-bean-name> <managed-bean-class>ca.gc.nrc.iit.toml.common.ClassificationSystemBean</mana ged-bean-class> <managed-bean-scope>request</managed-bean-scope> </managed-bean> LOMenuBackingBean.java: ------------------------ package ca.gc.nrc.iit.toml.frontend; import java.util.*; import ca.gc.nrc.iit.toml.common.*; public class LOMenuBackingBean { private Vector books = null; public Collection getBooks() { ClassificationSystemBean a = new ClassificationSystemBean(1, "title 1", "bla", false); ClassificationSystemBean b = new ClassificationSystemBean(2, "title 2", "lala", true); ClassificationSystemBean c = new ClassificationSystemBean(3, "title 3", "smurf", false); this.books.add(a); this.books.add(b); this.books.add(c); return this.books; } public void setClassificationSystems(Vector classificationSystems) { this.books = classificationSystems; } } ClassificationSystemBean.java: ------------------------------- package ca.gc.nrc.iit.toml.common; public class ClassificationSystemBean implements Serializable { private String classificationSystemName; public String getClassificationSystemName() { return classificationSystemName; } public void setClassificationSystemName(String classificationSystemName) { this.classificationSystemName = classificationSystemName; } } ----------------- I use MyFaces 1.0.9 and deploy the war in Tomcat 5.5.9 All I get is the following Stack Trace and I really, really don't know why. Everything works fine if I remove the dataTable tag (in that case, all I see is the message bundle output). But whenever I enter that dataTable, I get the exception. No matter what I tried, I always get the exception. I even did a copy&paste from some dataTable tutorials I found - same result. What do I do wrong? I have tried to work with Vector, List, Collection and others in LOMenuBacking Bean but nothing seems to work. All I ever get is the exception. Thanks so much! Matt javax.faces.FacesException: Expression: '#{bookListBean.books}' at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(Servl etExternalContextImpl.java:411) at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHand lerImpl.java:280) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:300) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:110) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:744) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Unknown Source) Caused by: org.apache.jasper.JasperException: Expression: '#{bookListBean.books}' at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3 70) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher. java:672) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDis patcher.java:463) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatch er.java:398) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher .java:301) at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(Servl etExternalContextImpl.java:405) ... 17 more org.apache.jasper.JasperException: Expression: '#{bookListBean.books}' at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3 70) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher. java:672) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDis patcher.java:463) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatch er.java:398) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher .java:301) at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(Servl etExternalContextImpl.java:405) at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHand lerImpl.java:280) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:300) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:110) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:744) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Unknown Source) javax.faces.el.EvaluationException: Expression: '#{bookListBean.books}' at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:466) at javax.faces.component.UIData.getValue(UIData.java:1173) at javax.faces.component.UIData.createDataModel(UIData.java:850) at javax.faces.component.UIData.getDataModel(UIData.java:839) at javax.faces.component.UIData.getRowCount(UIData.java:145) at org.apache.myfaces.renderkit.html.HtmlTableRendererBase.encodeChildren(HtmlT ableRendererBase.java:128) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:32 9) at javax.faces.webapp.UIComponentTag.encodeChildren(UIComponentTag.java:380) at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:288) at org.apache.myfaces.taglib.UIComponentBodyTagBase.doEndTag(UIComponentBodyTag Base.java:98) at org.apache.jsp.LOMenu_jsp._jspx_meth_h_dataTable_0(org.apache.jsp.LOMenu_jsp :404) at org.apache.jsp.LOMenu_jsp._jspx_meth_h_form_0(org.apache.jsp.LOMenu_jsp:342) at org.apache.jsp.LOMenu_jsp._jspx_meth_f_view_0(org.apache.jsp.LOMenu_jsp:138) at org.apache.jsp.LOMenu_jsp._jspService(org.apache.jsp.LOMenu_jsp:76) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3 22) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher. java:672) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDis patcher.java:463) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatch er.java:398) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher .java:301) at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(Servl etExternalContextImpl.java:405) at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHand lerImpl.java:280) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:300) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:110) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:744) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Unknown Source) Caused by: javax.faces.el.EvaluationException: Bean: ca.gc.nrc.iit.toml.frontend.LOMenuBackingBean, property: books at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl. java:423) at org.apache.myfaces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.jav a:104) at org.apache.myfaces.el.ELParserHelper$MyPropertySuffix.evaluate(ELParserHelpe r.java:555) at org.apache.commons.el.ComplexValue.evaluate(ComplexValue.java:145) at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:441) ... 43 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl. java:419) ... 47 more Caused by: java.lang.NullPointerException at ca.gc.nrc.iit.toml.frontend.LOMenuBackingBean.getBooks(LOMenuBackingBean.jav a:21) ... 52 more javax.faces.el.EvaluationException: Bean: ca.gc.nrc.iit.toml.frontend.LOMenuBackingBean, property: books at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl. java:423) at org.apache.myfaces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.jav a:104) at org.apache.myfaces.el.ELParserHelper$MyPropertySuffix.evaluate(ELParserHelpe r.java:555) at org.apache.commons.el.ComplexValue.evaluate(ComplexValue.java:145) at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:441) at javax.faces.component.UIData.getValue(UIData.java:1173) at javax.faces.component.UIData.createDataModel(UIData.java:850) at javax.faces.component.UIData.getDataModel(UIData.java:839) at javax.faces.component.UIData.getRowCount(UIData.java:145) at org.apache.myfaces.renderkit.html.HtmlTableRendererBase.encodeChildren(HtmlT ableRendererBase.java:128) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:32 9) at javax.faces.webapp.UIComponentTag.encodeChildren(UIComponentTag.java:380) at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:288) at org.apache.myfaces.taglib.UIComponentBodyTagBase.doEndTag(UIComponentBodyTag Base.java:98) at org.apache.jsp.LOMenu_jsp._jspx_meth_h_dataTable_0(org.apache.jsp.LOMenu_jsp :404) at org.apache.jsp.LOMenu_jsp._jspx_meth_h_form_0(org.apache.jsp.LOMenu_jsp:342) at org.apache.jsp.LOMenu_jsp._jspx_meth_f_view_0(org.apache.jsp.LOMenu_jsp:138) at org.apache.jsp.LOMenu_jsp._jspService(org.apache.jsp.LOMenu_jsp:76) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3 22) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher. java:672) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDis patcher.java:463) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatch er.java:398) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher .java:301) at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(Servl etExternalContextImpl.java:405) at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHand lerImpl.java:280) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:300) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:110) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:744) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl. java:419) ... 47 more Caused by: java.lang.NullPointerException at ca.gc.nrc.iit.toml.frontend.LOMenuBackingBean.getBooks(LOMenuBackingBean.jav a:21) ... 52 more java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl. java:419) at org.apache.myfaces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.jav a:104) at org.apache.myfaces.el.ELParserHelper$MyPropertySuffix.evaluate(ELParserHelpe r.java:555) at org.apache.commons.el.ComplexValue.evaluate(ComplexValue.java:145) at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:441) at javax.faces.component.UIData.getValue(UIData.java:1173) at javax.faces.component.UIData.createDataModel(UIData.java:850) at javax.faces.component.UIData.getDataModel(UIData.java:839) at javax.faces.component.UIData.getRowCount(UIData.java:145) at org.apache.myfaces.renderkit.html.HtmlTableRendererBase.encodeChildren(HtmlT ableRendererBase.java:128) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:32 9) at javax.faces.webapp.UIComponentTag.encodeChildren(UIComponentTag.java:380) at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:288) at org.apache.myfaces.taglib.UIComponentBodyTagBase.doEndTag(UIComponentBodyTag Base.java:98) at org.apache.jsp.LOMenu_jsp._jspx_meth_h_dataTable_0(org.apache.jsp.LOMenu_jsp :404) at org.apache.jsp.LOMenu_jsp._jspx_meth_h_form_0(org.apache.jsp.LOMenu_jsp:342) at org.apache.jsp.LOMenu_jsp._jspx_meth_f_view_0(org.apache.jsp.LOMenu_jsp:138) at org.apache.jsp.LOMenu_jsp._jspService(org.apache.jsp.LOMenu_jsp:76) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3 22) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher. java:672) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDis patcher.java:463) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatch er.java:398) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher .java:301) at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(Servl etExternalContextImpl.java:405) at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHand lerImpl.java:280) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:300) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:110) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:744) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.NullPointerException at ca.gc.nrc.iit.toml.frontend.LOMenuBackingBean.getBooks(LOMenuBackingBean.jav a:21) ... 52 more java.lang.NullPointerException at ca.gc.nrc.iit.toml.frontend.LOMenuBackingBean.getBooks(LOMenuBackingBean.jav a:21) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl. java:419) at org.apache.myfaces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.jav a:104) at org.apache.myfaces.el.ELParserHelper$MyPropertySuffix.evaluate(ELParserHelpe r.java:555) at org.apache.commons.el.ComplexValue.evaluate(ComplexValue.java:145) at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:441) at javax.faces.component.UIData.getValue(UIData.java:1173) at javax.faces.component.UIData.createDataModel(UIData.java:850) at javax.faces.component.UIData.getDataModel(UIData.java:839) at javax.faces.component.UIData.getRowCount(UIData.java:145) at org.apache.myfaces.renderkit.html.HtmlTableRendererBase.encodeChildren(HtmlT ableRendererBase.java:128) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:32 9) at javax.faces.webapp.UIComponentTag.encodeChildren(UIComponentTag.java:380) at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:288) at org.apache.myfaces.taglib.UIComponentBodyTagBase.doEndTag(UIComponentBodyTag Base.java:98) at org.apache.jsp.LOMenu_jsp._jspx_meth_h_dataTable_0(org.apache.jsp.LOMenu_jsp :404) at org.apache.jsp.LOMenu_jsp._jspx_meth_h_form_0(org.apache.jsp.LOMenu_jsp:342) at org.apache.jsp.LOMenu_jsp._jspx_meth_f_view_0(org.apache.jsp.LOMenu_jsp:138) at org.apache.jsp.LOMenu_jsp._jspService(org.apache.jsp.LOMenu_jsp:76) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3 22) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher. java:672) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDis patcher.java:463) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatch er.java:398) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher .java:301) at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(Servl etExternalContextImpl.java:405) at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHand lerImpl.java:280) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:300) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:110) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:744) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Unknown Source)
