Error about ListDataModel in the message example!
jasonqzy May 9, 2007 6:40 AMIn the message example,I modify the MessageManager.java MessageManagerBean.java message.jsp.When I delete the last message,it throws exception.But it's normal where I delete other messages.
MessageManager.java
//$Id: MessageManager.java,v 1.2 2006/05/23 05:30:24 gavin Exp $ package org.jboss.seam.example.messages; import javax.ejb.Local; @Local public interface MessageManager { public String getTitle(); public void setTitle(String title); public void findMessages(); public void select(); public void delete(); public void destroy(); }
MessageManagerBean.java
//$Id: MessageManagerBean.java,v 1.7 2006/11/19 21:01:33 gavin Exp $ package org.jboss.seam.example.messages; import static javax.persistence.PersistenceContextType.EXTENDED; import static org.jboss.seam.ScopeType.SESSION; import java.io.Serializable; import java.util.List; import javax.ejb.Remove; import javax.ejb.Stateful; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import org.jboss.seam.annotations.Destroy; import org.jboss.seam.annotations.Factory; import org.jboss.seam.annotations.Name; import org.jboss.seam.annotations.Out; import org.jboss.seam.annotations.Scope; import org.jboss.seam.annotations.datamodel.DataModel; import org.jboss.seam.annotations.datamodel.DataModelSelection; @Stateful @Scope(SESSION) @Name("messageManager") public class MessageManagerBean implements Serializable, MessageManager { private String title = "Test"; @DataModel private List<Message> messageList; @DataModelSelection @Out(required=false) private Message message; @PersistenceContext(type=EXTENDED) private EntityManager em; @Factory("messageList") public void findMessages() { messageList = em.createQuery("select msg from Message msg order by msg.datetime desc").getResultList(); } public String getTitle(){ return title; } public void setTitle(String title){ this.title = title; } public void select() { if (message!=null) message.setRead(true); } public void delete() { if (message!=null) { messageList.remove(message); em.remove(message); message=null; } } @Remove @Destroy public void destroy() {} }
message.jsp
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %> <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %> <%@ taglib uri="http://jboss.com/products/seam/taglib" prefix="s" %> <html> <head> <title>Messages</title> </head> <body> <f:view> <h2>Message List</h2> <h:outputText value="#{messageManager.title}" /> <h:outputText value="No messages to display" rendered="#{messageList.rowCount==0}"/> <h:dataTable var="msg" value="#{messageList}" rendered="#{messageList.rowCount>0}"> <h:column> <f:facet name="header"> <h:outputText value="Read"/> </f:facet> <h:selectBooleanCheckbox value="#{msg.read}" disabled="true"/> </h:column> <h:column> <f:facet name="header"> <h:outputText value="Title"/> </f:facet> <s:link value="#{msg.title}" action="#{messageManager.select}"/> </h:column> <h:column> <f:facet name="header"> <h:outputText value="Date/Time"/> </f:facet> <h:outputText value="#{msg.datetime}"> <s:convertDateTime type="both" dateStyle="medium" timeStyle="short"/> </h:outputText> </h:column> <h:column> <s:button value="Delete" action="#{messageManager.delete}"/> </h:column> </h:dataTable> <h3><h:outputText value="#{message.title}"/></h3> <div><h:outputText value="#{message.text}"/></div> </f:view> </body> </html>
The error
18:16:55,984 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception javax.faces.el.EvaluationException: Cannot get value for expression '#{messageManager.title}' at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:402) at javax.faces.component.UIOutput.getValue(UIOutput.java:77) at org.apache.myfaces.shared_impl.renderkit.RendererUtils.getStringValue(RendererUtils.java:217) at org.apache.myfaces.shared_impl.renderkit.html.HtmlTextRendererBase.renderOutput(HtmlTextRendererBase.java:69) at org.apache.myfaces.shared_impl.renderkit.html.HtmlTextRendererBase.encodeEnd(HtmlTextRendererBase.java:57) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:536) at javax.faces.webapp.UIComponentTag.encodeEnd(UIComponentTag.java:495) at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:363) at org.apache.jsp.messages_jsp._jspx_meth_h_outputText_0(messages_jsp.java:172) at org.apache.jsp.messages_jsp._jspx_meth_f_view_0(messages_jsp.java:126) at org.apache.jsp.messages_jsp._jspService(messages_jsp.java:91) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:416) at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:234) at org.jboss.seam.jsf.SeamViewHandler.renderView(SeamViewHandler.java:59) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:384) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:138) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) 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:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) at java.lang.Thread.run(Thread.java:619) Caused by: javax.faces.el.EvaluationException: Exception getting value of property title of base of type : org.javassist.tmp.java.lang.Object_$$_javassist_1 at org.apache.myfaces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.java:96) at org.apache.myfaces.el.ELParserHelper$MyPropertySuffix.evaluate(ELParserHelper.java:532) at org.apache.commons.el.ComplexValue.evaluate(ComplexValue.java:145) at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:383) ... 46 more Caused by: javax.faces.el.EvaluationException: Bean: org.javassist.tmp.java.lang.Object_$$_javassist_1, property: title at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl.java:442) at org.apache.myfaces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.java:82) ... 49 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl.java:438) ... 50 more Caused by: javax.ejb.EJBException: java.lang.IllegalArgumentException: row is unavailable at org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:69) at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83) at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:197) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(StatefulInstanceInterceptor.java:83) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78) at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:131) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateful.StatefulContainer.localInvoke(StatefulContainer.java:203) at org.jboss.ejb3.stateful.StatefulLocalProxy.invoke(StatefulLocalProxy.java:98) at $Proxy94.getTitle(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.seam.util.Reflections.invoke(Reflections.java:20) at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31) at org.jboss.seam.intercept.ClientSideInterceptor$1.proceed(ClientSideInterceptor.java:72) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:57) at org.jboss.seam.interceptors.RemoveInterceptor.aroundInvoke(RemoveInterceptor.java:40) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69) at org.jboss.seam.interceptors.SynchronizationInterceptor.aroundInvoke(SynchronizationInterceptor.java:31) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69) at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:103) at org.jboss.seam.intercept.ClientSideInterceptor.invoke(ClientSideInterceptor.java:50) at org.javassist.tmp.java.lang.Object_$$_javassist_1.getTitle(Object_$$_javassist_1.java) ... 55 more Caused by: java.lang.IllegalArgumentException: row is unavailable at javax.faces.model.ListDataModel.getRowData(ListDataModel.java:63) at org.jboss.seam.databinding.DataModelBinder.getSelection(DataModelBinder.java:69) at org.jboss.seam.databinding.DataModelBinder.getSelection(DataModelBinder.java:19) at org.jboss.seam.Component.injectDataModelSelection(Component.java:1274) at org.jboss.seam.Component.injectDataModelSelections(Component.java:1254) at org.jboss.seam.Component.inject(Component.java:1196) at org.jboss.seam.interceptors.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:46) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69) at org.jboss.seam.interceptors.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:27) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69) at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:103) at org.jboss.seam.intercept.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:53) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:118) at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.entity.ExtendedPersistenceContextPropagationInterceptor.invoke(ExtendedPersistenceContextPropagationInterceptor.java:71) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79) ... 86 more