SelectItem in TaskBean.java and Task.jsp
pjmvn Jan 11, 2006 8:42 PMHi all.
I have a problem, please help me.
In TaskBean.java, i have a function is called: getExamDebug
public List getExamDebug(){ System.out.println("debug from exam"); List temp1 = new ArrayList(); SelectItem item=new SelectItem("item1", "item1"); temp1.add(item); item=new SelectItem("item2", "item2"); temp1.add(item); System.out.println("debug from exam"); return temp1; }
When this function is called, it will return only a List of SelectItem object.
In Task.jsp i have this code:
.... <h:inputHidden id="taskInstanceId" value="#{taskBean.taskInstanceId}"/> <h2><h:outputText value="#{taskBean.taskInstance.name}" /></h2> <h:selectOneListbox> <f:selectItems value="#{taskBean.examDebug}" /> </h:selectOneListbox> ...
Do not pay attention to my file.par.
In the first run of Web Appp
After i login and the task.jsp is displayed. I have a OneListBox have two item as code above.
But when i click "Save an Close" to translate to a user called "A".
And then i login with User "A", next i select a task from TaskList of this User the task.jsp is error.
Error:
08:31:12,687 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception java.lang.IllegalArgumentException: Collection referenced by UISelectItems with binding '#{taskBean.listData}' and Component-Path : {Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /task.jsp][Class: javax.faces.component.html.HtmlForm,Id: taskform][Class: javax.faces.component.html.HtmlPanelGrid,Id: _id4][Class: javax.faces.component.html.HtmlSelectOneListbox,Id: _id5][Class: javax.faces.component.UISelectItems,Id: _id6]} does not contain Objects of type SelectItem at org.apache.myfaces.util.SelectItemsIterator.next(SelectItemsIterator.java:182) at org.apache.myfaces.renderkit.RendererUtils.internalGetSelectItemList(RendererUtils.java:487) at org.apache.myfaces.renderkit.RendererUtils.getSelectItemList(RendererUtils.java:461) at org.apache.myfaces.renderkit.html.HtmlRendererUtils.internalRenderSelect(HtmlRendererUtils.java:277) at org.apache.myfaces.renderkit.html.HtmlRendererUtils.renderListbox(HtmlRendererUtils.java:240) at org.apache.myfaces.renderkit.html.HtmlListboxRendererBase.encodeEnd(HtmlListboxRendererBase.java:73) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:331) at org.apache.myfaces.renderkit.RendererUtils.renderChild(RendererUtils.java:450) at org.apache.myfaces.renderkit.html.HtmlGridRendererBase.renderChildren(HtmlGridRendererBase.java:203) at org.apache.myfaces.renderkit.html.HtmlGridRendererBase.encodeEnd(HtmlGridRendererBase.java:85) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:331) at javax.faces.webapp.UIComponentTag.encodeEnd(UIComponentTag.java:349) at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:253) at org.apache.myfaces.taglib.UIComponentBodyTagBase.doEndTag(UIComponentBodyTagBase.java:55) at org.apache.jsp.task_jsp._jspx_meth_h_panelGrid_0(org.apache.jsp.task_jsp:466) at org.apache.jsp.task_jsp._jspx_meth_h_form_0(org.apache.jsp.task_jsp:336) at org.apache.jsp.task_jsp._jspx_meth_tiles_put_1(org.apache.jsp.task_jsp:264) at org.apache.jsp.task_jsp._jspx_meth_tiles_insert_0(org.apache.jsp.task_jsp:202) at org.apache.jsp.task_jsp._jspx_meth_f_view_0(org.apache.jsp.task_jsp:166) at org.apache.jsp.task_jsp._jspService(org.apache.jsp.task_jsp:131) 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:322) 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:415) at org.apache.myfaces.application.jsp.JspTilesViewHandlerImpl.dispatch(JspTilesViewHandlerImpl.java:233) at org.apache.myfaces.application.jsp.JspTilesViewHandlerImpl.renderView(JspTilesViewHandlerImpl.java:219) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:300) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:95) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jbpm.webapp.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:25) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jbpm.webapp.filter.PersistenceFilter.doFilter(PersistenceFilter.java:28) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jbpm.webapp.filter.ContextFilter.doFilter(ContextFilter.java:19) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jbpm.webapp.filter.LogFilter.doFilter(LogFilter.java:38) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81) 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.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59) 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.processConnection(Http11Protocol.java:744) 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:595) 08:31:12,859 DEBUG [PersistenceContext] rolling back transaction 08:31:12,875 ERROR [[FacesServlet]] Servlet.service() for servlet FacesServlet threw exception javax.faces.FacesException: Collection referenced by UISelectItems with binding '#{taskBean.listData}' and Component-Path : {Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /task.jsp][Class: javax.faces.component.html.HtmlForm,Id: taskform][Class: javax.faces.component.html.HtmlPanelGrid,Id: _id4][Class: javax.faces.component.html.HtmlSelectOneListbox,Id: _id5][Class: javax.faces.component.UISelectItems,Id: _id6]} does not contain Objects of type SelectItem at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:421) at org.apache.myfaces.application.jsp.JspTilesViewHandlerImpl.dispatch(JspTilesViewHandlerImpl.java:233) at org.apache.myfaces.application.jsp.JspTilesViewHandlerImpl.renderView(JspTilesViewHandlerImpl.java:219) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:300) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:95) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jbpm.webapp.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:25) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jbpm.webapp.filter.PersistenceFilter.doFilter(PersistenceFilter.java:28) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jbpm.webapp.filter.ContextFilter.doFilter(ContextFilter.java:19) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jbpm.webapp.filter.LogFilter.doFilter(LogFilter.java:38) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81) 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.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59) 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.processConnection(Http11Protocol.java:744) 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:595) Caused by: org.apache.jasper.JasperException: Collection referenced by UISelectItems with binding '#{taskBean.listData}' and Component-Path : {Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /task.jsp][Class: javax.faces.component.html.HtmlForm,Id: taskform][Class: javax.faces.component.html.HtmlPanelGrid,Id: _id4][Class: javax.faces.component.html.HtmlSelectOneListbox,Id: _id5][Class: javax.faces.component.UISelectItems,Id: _id6]} does not contain Objects of type SelectItem at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370) 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:415) ... 35 more
I do not know why this error occur ?????
Please give an answer.
Thank very much.