1 Reply Latest reply on Feb 22, 2007 10:54 AM by Greg Zoller

    Entities Get Updated--Screen Doesn't (Usually)

    Greg Zoller Newbie

      I'm having a strange problem where particular entity changes are not (usually) being reflected on my screens. I start with a vanilla seam-gen application that generates these artifacts:


      DepartmentList.xhtml (main application screen)
      DepartmentList.page.xml
      ProjectList.xhmtl (List of Projects)
      ProjectList.page.xhtml

      Department.java (@Entity)
      DepartmentList.java (extends EntityQuery)
      DeparmentHome (extends EntityHome)
      Project.java (@Entity)
      ProjectList.java (extends EntityQuery)
      ProjectHome (extends EntityHome)


      Easiest way to show you where I'm going is to look at a picture of part of the DepartmentList screen: http://sawdust.50webs.com/images/spurs_display.jpg
      (No comments on the artwork please--I'm a server-side guy! I'll let the UI pros do what they do best.)
      You'll see departments with a sub-listing of projects for ea. dept.

      You see the "tape recorder" buttons? They change the status on Projects (update the entity). When I push these buttons the Project entities actually are correctly persisted to the database but no changes appear on the DisplayList screen. :-( Reloading the screen or visiting most other screens has no effect--the db and the screen are still out-of-sync.

      Here's the weird part: If I first go to the ProjectList.xhtml screen (not touching anything there--just let it render) then immediately go back to DepartmentList.xhtml then click on a tape-recorder button for one click only the on-screen status changes immediately as desired. Subsequent clicks continue to change the persisted Project status but no screen changes occur unless I again visit ProjectList.xhtml. Huh?

      This is hard to diagnose w/o seeing all the code, but I didn't want to dump reams of useless code into the forum. I'll post a chunk of ProjectList.xhtml since there seems to be some "magic" in simply visiting this page. If other files would be helpful let me know and I'll post them.

      When I click a tape-recorder button in DepartmentList.xhtml (<s:link> w/image) I pass the ProjectId as a <f:param>. A stateful session bean does an em.find() on the ProjectId to get the Project entity, simply calls proj.setStatus() and we're done. Nothing fancy. Somewhere, somehow--something in the UI is still holding onto a copy of the previous Project object.

      Thanks in advance for any advice/clues!
      Greg

      ProjectList.xhtml
      <!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
       "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
      
      <ui:composition xmlns="http://www.w3.org/1999/xhtml"
       xmlns:s="http://jboss.com/products/seam/taglib"
       xmlns:ui="http://java.sun.com/jsf/facelets"
       xmlns:f="http://java.sun.com/jsf/core"
       xmlns:h="http://java.sun.com/jsf/html"
       template="layout/template.xhtml">
      
      <ui:define name="body">
      
       <h:messages globalOnly="true" styleClass="message" id="globalMessages"/>
       <div class="results" id="projectList">
      
       <h3>Projects</h3>
      
       <h:outputText value="No project exists"
       rendered="#{empty projectList.resultList}"/>
      
       <h:dataTable id="projectList"
       var="project"
       value="#{projectList.resultList}"
       rendered="#{not empty projectList.resultList}">
       <h:column>
       <f:facet name="header">
       <s:link styleClass="columnHeader"
       value="projectId #{projectList.order=='projectId asc' ? messages.down : ( projectList.order=='projectId desc' ? messages.up : '' )}">
       <f:param name="order" value="#{projectList.order=='projectId asc' ? 'projectId desc' : 'projectId asc'}"/>
       </s:link>
       </f:facet>
       #{project.projectId}
       </h:column>
       <h:column>
       <f:facet name="header">
       <s:link styleClass="columnHeader"
       value="version #{projectList.order=='version asc' ? messages.down : ( projectList.order=='version desc' ? messages.up : '' )}">
       <f:param name="order" value="#{projectList.order=='version asc' ? 'version desc' : 'version asc'}"/>
       </s:link>
       </f:facet>
       #{project.version}
       </h:column>
       <h:column>
       <f:facet name="header">
       <s:link styleClass="columnHeader"
       value="department deptId #{projectList.order=='department.deptId asc' ? messages.down : ( projectList.order=='department.deptId desc' ? messages.up : '' )}">
       <f:param name="order" value="#{projectList.order=='department.deptId asc' ? 'department.deptId desc' : 'department.deptId asc'}"/>
       </s:link>
       </f:facet>
       #{project.department.deptId}
       </h:column>
      
       <!-- CLIP! Lots more like this to draw out the rest of Project's fields -->
       </h:dataTable>
      
       </div>
      
       <div class="tableControl">
      
       <s:link view="/ProjectList.xhtml"
       rendered="#{projectList.previousExists}"
       value="#{messages.left}#{messages.left} First Page"
       id="firstPage">
       <f:param name="firstResult" value="0"/>
       </s:link>
      
       <s:link view="/ProjectList.xhtml"
       rendered="#{projectList.previousExists}"
       value="#{messages.left} Previous Page"
       id="previousPage">
       <f:param name="firstResult"
       value="#{projectList.previousFirstResult}"/>
       </s:link>
      
       <s:link view="/ProjectList.xhtml"
       rendered="#{projectList.nextExists}"
       value="Next Page #{messages.right}"
       id="nextPage">
       <f:param name="firstResult"
       value="#{projectList.nextFirstResult}"/>
       </s:link>
      
       <s:link view="/ProjectList.xhtml"
       rendered="#{projectList.nextExists}"
       value="Last Page #{messages.right}#{messages.right}"
       id="lastPage">
       <f:param name="firstResult"
       value="#{projectList.lastFirstResult}"/>
       </s:link>
      
       </div>
      
       <s:div styleClass="actionButtons" rendered="#{empty from}">
       <s:button view="/ProjectEdit.xhtml"
       id="create"
       value="Create project">
       <f:param name="projectProjectId"/>
       </s:button>
       </s:div>
      
      </ui:define>
      
      </ui:composition>
      


        • 1. Re: Entities Get Updated--Screen Doesn't (Usually)
          Greg Zoller Newbie

          Play the happy music--I found it!

          I really hate when people solve their own problems and don't post their solutions. Then when I search the forum and say "Hey, I've got the exact problem... but where's the solution?"

          So after a couple hours of line-by-line combing through code the answer lay hidden in one spot. I noticed that in the seam-gen generated header buttons ProjectList.xhml was called like this:

           <s:link view="/ProjectList.xhtml"
           value="Project List"
           propagation="none"/>
          


          The <s:link>'s I was using for my "tape-recorder" buttons didn't have the propagation="none" field. I added it and there it is--working.

          Now that its working I have to go back and figure out what this attribute actually does! :-)