I have developed a web page using JBoss GA 4.2.1, Seam and PostgreSQL. I can deploy it successfully on Windows platform. But when I deploy it in Red Hat 4, I really get a serious problem. I don't know why and What's going on..... Are there anyone can help me? | 22:41:21,833 ERROR [ExceptionFilter] handling uncaught exception | javax.servlet.ServletException: /QuestionList.xhtml @23,85 value="#{questionList .question.content}": Target Unreachable, identifier 'questionList' resolved to n ull | at javax.faces.webapp.FacesServlet.service(FacesServlet.java:256) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:290) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:83) | at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.jav a:63) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:87) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:63) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:46) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseX MLFilter.java:127) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter. java:277) | at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:40) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:140) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) | at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi lter.java:96) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV alve.java:230) | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV alve.java:175) | at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit yAssociationValve.java:179) | at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica torBase.java:433) | at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv e.java:84) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j ava:128) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j ava:104) | at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedC onnectionValve.java:157) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal ve.java:109) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav a:241) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java :844) | at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce ss(Http11Protocol.java:580) | at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:44 7) | at java.lang.Thread.run(Thread.java:595) | Caused by: javax.el.PropertyNotFoundException: /QuestionList.xhtml @23,85 value= "#{questionList.question.content}": Target Unreachable, identifier 'questionList ' resolved to null | at com.sun.facelets.el.TagValueExpression.getType(TagValueExpression.jav a:62) | at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConverte dValue(HtmlBasicInputRenderer.java:81) | at javax.faces.component.UIInput.getConvertedValue(UIInput.java:934) | at javax.faces.component.UIInput.validate(UIInput.java:860) | at javax.faces.component.UIInput.executeValidate(UIInput.java:1065) | at javax.faces.component.UIInput.processValidators(UIInput.java:666) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBa se.java:1033) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBa se.java:1033) | at javax.faces.component.UIForm.processValidators(UIForm.java:229) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBa se.java:1033) | at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:66 2) | at org.ajax4jsf.framework.ajax.AjaxViewRoot.access$201(AjaxViewRoot.java :53) | at org.ajax4jsf.framework.ajax.AjaxViewRoot$3.invokeRoot(AjaxViewRoot.ja va:315) | at org.ajax4jsf.framework.ajax.JsfOneOneInvoker.invokeOnRegionOrRoot(Jsf OneOneInvoker.java:53) | at org.ajax4jsf.framework.ajax.AjaxContext.invokeOnRegionOrRoot(AjaxCont ext.java:191) | at org.ajax4jsf.framework.ajax.AjaxViewRoot.processValidators(AjaxViewRo ot.java:329) | at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValida tionsPhase.java:100) | at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251) | at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117) | at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244) | ... 35 more | 22:41:21,846 ERROR [ExceptionFilter] exception root cause | javax.el.PropertyNotFoundException: /QuestionList.xhtml @23,85 value="#{question List.question.content}": Target Unreachable, identifier 'questionList' resolved to null | at com.sun.facelets.el.TagValueExpression.getType(TagValueExpression.jav a:62) | at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConverte dValue(HtmlBasicInputRenderer.java:81) | at javax.faces.component.UIInput.getConvertedValue(UIInput.java:934) | at javax.faces.component.UIInput.validate(UIInput.java:860) | at javax.faces.component.UIInput.executeValidate(UIInput.java:1065) | at javax.faces.component.UIInput.processValidators(UIInput.java:666) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBa se.java:1033) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBa se.java:1033) | at javax.faces.component.UIForm.processValidators(UIForm.java:229) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBa se.java:1033) | at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:66 2) | at org.ajax4jsf.framework.ajax.AjaxViewRoot.access$201(AjaxViewRoot.java :53) | at org.ajax4jsf.framework.ajax.AjaxViewRoot$3.invokeRoot(AjaxViewRoot.ja va:315) | at org.ajax4jsf.framework.ajax.JsfOneOneInvoker.invokeOnRegionOrRoot(Jsf OneOneInvoker.java:53) | at org.ajax4jsf.framework.ajax.AjaxContext.invokeOnRegionOrRoot(AjaxCont ext.java:191) | at org.ajax4jsf.framework.ajax.AjaxViewRoot.processValidators(AjaxViewRo ot.java:329) | at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValida tionsPhase.java:100) | at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251) | at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117) | at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:290) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:83) | at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.jav a:63) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:87) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:63) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:46) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseX MLFilter.java:127) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter. java:277) | at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:40) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:140) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) | at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi lter.java:96) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV alve.java:230) | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV alve.java:175) | at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit yAssociationValve.java:179) | at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica torBase.java:433) | at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv e.java:84) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j ava:128) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j ava:104) | at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedC onnectionValve.java:157) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal ve.java:109) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav a:241) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java :844) | at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce ss(Http11Protocol.java:580) | at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:44 7) | at java.lang.Thread.run(Thread.java:595) | 22:41:21,920 ERROR [DebugPageHandler] redirecting to debug page | javax.el.PropertyNotFoundException: /QuestionList.xhtml @23,85 value="#{question List.question.content}": Target Unreachable, identifier 'questionList' resolved to null | at com.sun.facelets.el.TagValueExpression.getType(TagValueExpression.jav a:62) | at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConverte dValue(HtmlBasicInputRenderer.java:81) | at javax.faces.component.UIInput.getConvertedValue(UIInput.java:934) | at javax.faces.component.UIInput.validate(UIInput.java:860) | at javax.faces.component.UIInput.executeValidate(UIInput.java:1065) | at javax.faces.component.UIInput.processValidators(UIInput.java:666) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBa se.java:1033) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBa se.java:1033) | at javax.faces.component.UIForm.processValidators(UIForm.java:229) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBa se.java:1033) | at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:66 2) | at org.ajax4jsf.framework.ajax.AjaxViewRoot.access$201(AjaxViewRoot.java :53) | at org.ajax4jsf.framework.ajax.AjaxViewRoot$3.invokeRoot(AjaxViewRoot.ja va:315) | at org.ajax4jsf.framework.ajax.JsfOneOneInvoker.invokeOnRegionOrRoot(Jsf OneOneInvoker.java:53) | at org.ajax4jsf.framework.ajax.AjaxContext.invokeOnRegionOrRoot(AjaxCont ext.java:191) | at org.ajax4jsf.framework.ajax.AjaxViewRoot.processValidators(AjaxViewRo ot.java:329) | at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValida tionsPhase.java:100) | at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251) | at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117) | at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:290) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:83) | at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.jav a:63) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:87) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:63) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:46) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseX MLFilter.java:127) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter. java:277) | at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:40) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter .java:69) | at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:140) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) | at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi lter.java:96) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:206) | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV alve.java:230) | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV alve.java:175) | at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit yAssociationValve.java:179) | at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica torBase.java:433) | at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv e.java:84) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j ava:128) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j ava:104) | at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedC onnectionValve.java:157) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal ve.java:109) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav a:241) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java :844) | at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce ss(Http11Protocol.java:580) | at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:44 7) | at java.lang.Thread.run(Thread.java:595) | 22:41:22,204 ERROR [STDERR] Oct 11, 2007 10:41:22 PM com.sun.facelets.compiler.T agLibraryConfig loadImplicit | INFO: Added Library from: jar:file:/data/jboss-4.2.1.GA/server/default/tmp/deplo y/tmp29135kadoo.ear-contents/kadoo-exp.war/WEB-INF/lib/jboss-seam-pdf.jar!/META- INF/seam-pdf.taglib.xml | 22:41:22,208 ERROR [STDERR] Oct 11, 2007 10:41:22 PM com.sun.facelets.compiler.T agLibraryConfig loadImplicit | INFO: Added Library from: jar:file:/data/jboss-4.2.1.GA/server/default/tmp/deplo y/tmp29135kadoo.ear-contents/kadoo-exp.war/WEB-INF/lib/jsf-facelets.jar!/META-IN F/jstl-core.taglib.xml | 22:41:22,222 ERROR [STDERR] Oct 11, 2007 10:41:22 PM com.sun.facelets.compiler.T agLibraryConfig loadImplicit | INFO: Added Library from: jar:file:/data/jboss-4.2.1.GA/server/default/tmp/deplo y/tmp29135kadoo.ear-contents/kadoo-exp.war/WEB-INF/lib/jsf-facelets.jar!/META-IN F/jsf-core.taglib.xml | 22:41:22,232 ERROR [STDERR] Oct 11, 2007 10:41:22 PM com.sun.facelets.compiler.T agLibraryConfig loadImplicit | INFO: Added Library from: jar:file:/data/jboss-4.2.1.GA/server/default/tmp/deplo y/tmp29135kadoo.ear-contents/kadoo-exp.war/WEB-INF/lib/ajax4jsf-1.1.1.jar!/META- INF/a4j.taglib.xml | 22:41:22,241 ERROR [STDERR] Oct 11, 2007 10:41:22 PM com.sun.facelets.compiler.T agLibraryConfig loadImplicit | INFO: Added Library from: jar:file:/data/jboss-4.2.1.GA/server/default/tmp/deplo y/tmp29135kadoo.ear-contents/kadoo-exp.war/WEB-INF/lib/jboss-seam-mail.jar!/META -INF/seam-mail.taglib.xml | 22:41:22,249 ERROR [STDERR] Oct 11, 2007 10:41:22 PM com.sun.facelets.compiler.T agLibraryConfig loadImplicit | INFO: Added Library from: jar:file:/data/jboss-4.2.1.GA/server/default/tmp/deplo y/tmp29135kadoo.ear-contents/kadoo-exp.war/WEB-INF/lib/jsf-facelets.jar!/META-IN F/jsf-ui.taglib.xml | 22:41:22,255 ERROR [STDERR] Oct 11, 2007 10:41:22 PM com.sun.facelets.compiler.T agLibraryConfig loadImplicit | INFO: Added Library from: jar:file:/data/jboss-4.2.1.GA/server/default/tmp/deplo y/tmp29135kadoo.ear-contents/kadoo-exp.war/WEB-INF/lib/jsf-facelets.jar!/META-IN F/jsf-html.taglib.xml | 22:41:22,264 ERROR [STDERR] Oct 11, 2007 10:41:22 PM com.sun.facelets.compiler.T agLibraryConfig loadImplicit | INFO: Added Library from: jar:file:/data/jboss-4.2.1.GA/server/default/tmp/deplo y/tmp29135kadoo.ear-contents/kadoo-exp.war/WEB-INF/lib/jsf-facelets.jar!/META-IN F/jstl-fn.taglib.xml | 22:41:22,277 ERROR [STDERR] Oct 11, 2007 10:41:22 PM com.sun.facelets.compiler.T agLibraryConfig loadImplicit | INFO: Added Library from: jar:file:/data/jboss-4.2.1.GA/server/default/tmp/deplo y/tmp29135kadoo.ear-contents/kadoo-exp.war/WEB-INF/lib/richfaces-3.0.1.jar!/META -INF/rich.taglib.xml | 22:41:22,287 ERROR [STDERR] Oct 11, 2007 10:41:22 PM com.sun.facelets.compiler.T agLibraryConfig loadImplicit | INFO: Added Library from: jar:file:/data/jboss-4.2.1.GA/server/default/tmp/deplo y/tmp29135kadoo.ear-contents/kadoo-exp.war/WEB-INF/lib/jboss-seam-ui.jar!/META-I NF/s.taglib.xml | | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4094203#... 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