5:20 a.m.
In the message example,I add some code in MessageManager.java?MessageManagerBean.java and
message.jsp like following.
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>
|
When I delete the last message of the message list,I get 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
|
But WhenI delete other message,it's normal. Why?[/url]
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