[JBoss Seam] - Component bindings in Conversation scope - jboss-user

Monday, 18 December 2006

I think I'm correct in saying that currently you cannot have a conversation scoped
component that has UIComponent bindings.

e.g. of a minimal example

Facelet view

  | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  | <html xmlns="http://www.w3.org/1999/xhtml"
  |       xmlns:f="http://java.sun.com/jsf/core"
  |       xmlns:h="http://java.sun.com/jsf/html"
  | 	  xmlns:ui="http://java.sun.com/jsf/facelets">
  |   <head>
  |     <title></title>
  |   </head>
  |   <body>
  |     <h:form>
  |       <h:outputText value="Text"
binding="#{testBean.outputText}"/>
  | 
  |       <h:commandButton value="Submit"/>
  |     </h:form>
  |   </body>
  | </html>
  | 

And the bean

  | @Name( "testBean" )
  | @Scope( ScopeType.CONVERSATION )
  | public class TestBean
  | {
  |     private HtmlOutputText outputText;
  | 
  |     public HtmlOutputText getOutputText()
  |     {
  |         return outputText;
  |     }
  | 
  |     public void setOutputText( HtmlOutputText outputText )
  |     {
  |         this.outputText = outputText;
  |     }
  | }
  | 

It is fine during the initial rendering of the page but if you click the button to do a
postback the setOutputText() is called during the restore view phase which is before the
conversation context is created by Seam (done in the afterPhase() of the restore view), so
the component is unavailable.

For completeness here's the exception.

  | javax.el.PropertyNotFoundException: /index.xhtml @11,68
binding="#{testBean.outputText}": Target Unreachable, identifier
'testBean' resolved to null
  | 	at com.sun.facelets.el.TagValueExpression.setValue(TagValueExpression.java:95)
  | 	at
com.sun.faces.lifecycle.RestoreViewPhase.doPerComponentActions(RestoreViewPhase.java:228)
  | 	at
com.sun.faces.lifecycle.RestoreViewPhase.doPerComponentActions(RestoreViewPhase.java:233)
  | 	at
com.sun.faces.lifecycle.RestoreViewPhase.doPerComponentActions(RestoreViewPhase.java:233)
  | 	at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:186)
  | 	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:248)
  | 	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(ApplicationFilterChain.java:290)
  | 	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  | 	at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
  | 	at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
  | 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
  | 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
  | 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
  | 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:212)
  | 	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:818)
  | 	at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:624)
  | 	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
  | 	at java.lang.Thread.run(Thread.java:595)
  | 

The short term workaround would be to put component bindings in an event scoped component
and inject it into the conversation component but I'd prefer not to do this.

Is it possible via some configuration/option to allow this particular combination?  I
looked at the SeamPhaseListener and it would be trivial to move the conversation setup
code into the beforePhase() of restore view but I have no idea what side-effects this will
have and if it will work.

Is the conversation setup done after restore view for a particular reason? Would be very
useful to me personally as I think I will frequently need to bind UI components to do
certain types of dynamic page creation in the code. I'm willing to spend some time
looking at/trying this if it's worth investigating a change.

Cheers.

Mike.

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[JBoss Seam] - Component bindings in Conversation scope