[jboss-user] [JBoss Seam] - Bug? Outjected boolean changes value mid-template

Mon Feb 4 15:26:20 EST 2008

I am seeing very odd behavior where the value of an outjected boolean changes in the middle of a template, but no assignment was done.  I think it has to do with how it is scoped.  

Expected/ Intended Behavior:
The value, newPortfolioForm is toggled based on whether or not a form should be displayed on a page.  It is triggered when the user clicks the "add" button.  The field is EVENT scoped, such that if the user clicks "add" and then decides to do something other than submit the form, the form will be hidden again (i.e. the action is cancelled).  However, on subsequent requests (i.e. any page refresh), it appears that the outjected value for newPortfolioForm is null and then changes back to true after a DataModel from the same SLSB is rendered.  

Here is my (simplified) template:

  | <html xmlns="http://www.w3.org/1999/xhtml"
  | 	xmlns:s="http://jboss.com/products/seam/taglib"
  | 	xmlns:f="http://java.sun.com/jsf/core"
  | 	xmlns:h="http://java.sun.com/jsf/html">
  | 	
  | 	<body>
  | 		<s:button value='Add' title='create a new profile'
  | 			action='#{portfolioHandler.addPortfolio}' 
  | 			rendered='#{!showPortfolioForm}' />
  | 		
  | 		<s:div rendered='#{showPortfolioForm == null}'>showPortfolioForm is null</s:div>
  | 		<s:div rendered='#{showPortfolioForm}'>showPortfolioForm is true</s:div>
  | 		#{portfolios} <br />
  | 		<s:div rendered='#{showPortfolioForm == true}'>showPortfolioForm is TRUE!!!</s:div>
  | 		<s:div rendered='#{showPortfolioForm == null}'>showPortfolioForm is null</s:div>
  | 		<s:div rendered='#{showPortfolioForm == false}'>showPortfolioForm is false</s:div>
  | 	</body>
  | </html>
  | 

And my SLSB:

  | @Stateless @Name("portfolioHandler")
  | public class PortfolioHandlerImpl implements PortfolioHandler {
  | 	
  | 	@DataModelSelection("portfolios")
  | 	@In(required=false) @Out(required=false) 
  | 	private Portfolio portfolio;
  | 	
  | 	@Out private boolean showPortfolioForm = false;
  | 	
  | 	@DataModel List<Portfolio> portfolios;
  | 	
  | 	public void addPortfolio() {
  | 		showPortfolioForm = true; // display the form
  | 	}
  | 	
  | 	public void updatePortfolio() {
  | 		// save method...
  | 	}
  | 
  | 	// factory and other CRUD methods here...
  | }
  | 

Output after initial page load (OK):

  | showPortfolioForm is null
  | org.jboss.seam.jsf.ListDataModel at c74f8c4 
  | showPortfolioForm is false
  | 

Output after button click (OK - consistent state):

  | showPortfolioForm is true
  | org.jboss.seam.jsf.ListDataModel at 1f65c446 
  | showPortfolioForm is TRUE!!!
  | 

Output after page reload (BAD - it changed!!):

  | showPortfolioForm is null
  | org.jboss.seam.jsf.ListDataModel at 35efd6ed 
  | showPortfolioForm is TRUE!!!
  | 

Now, I'm not surprised that showPortfolioForm was boxed to a Boolean and is null.  However -- why does the value change after #{portfolios} is referenced?!?  Null and false are close enough as far as boolean logic is concerned that I didn't notice this is actually happening on the first page load too -- the value is null and then false.  

I would submit that this is a bug -- the state within the template is not consistent, even though none of my code has changed it.  There is a similar effect if the scope is set to PAGE. If the value was re-initialized to false it would be OK, but why is it picking up the old value even though it is clearly out of scope?  

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