[jbossseam-issues] [JBoss JIRA] Assigned: (JBSEAM-1770) Infinite loop when in some pages.xml configuration

Pete Muir (JIRA) jira-events at lists.jboss.org
Wed Aug 8 07:53:57 EDT 2007


     [ http://jira.jboss.com/jira/browse/JBSEAM-1770?page=all ]

Pete Muir reassigned JBSEAM-1770:
---------------------------------

    Assignee: Pete Muir

> Infinite loop when in some pages.xml configuration
> --------------------------------------------------
>
>                 Key: JBSEAM-1770
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-1770
>             Project: JBoss Seam
>          Issue Type: Bug
>    Affects Versions: 2.0.0.BETA1
>         Environment: windows XP, RHEL 5.0
>            Reporter: Richard Leherpeur
>         Assigned To: Pete Muir
>
> You can download this example on the Seam web site: navigation.zip
> I have the following classes:
> Code:
> @Name("user")
> @Scope(ScopeType.CONVERSATION)
> public class User implements Serializable {
> 	private String pet;
> 	public String getPet() {
> 	  return pet;
> 	}
> 	public void setPet(String pet) {
> 	  this.pet = pet;
> 	}
> }
> 	
> Code:
> @Name("navigation")
> @Scope(ScopeType.CONVERSATION)
> public class Navigation implements Serializable {
> 	@In(required=true)
> 	User user;
> 	@Logger
> 	private Log log;
> 	public String animalOutcome(){
> 		if (user == null){
> 			return "Dog"; // Just to make sure we don't return null
> 		}
> 		log.info("********* Outcome: " + user.getPet());
> 		return user.getPet();
> 	}
> 	public User getUser() {
> 	  return user;
> 	}
> 	public void setUser(User user) {
> 	  this.user = user;
> 	}
> }
> 	
> Code:
> @Name("animals")
> public class AnimalList
> {
>    private List<String> animals;
>    
>    @Unwrap
>    public List<String> unwrap()
>    {
>       if (animals == null)
>       {
>          animals = new ArrayList<String>();
>          animals.add("Dog");
>          animals.add("Cat");
>          animals.add("Goldfish");
>          animals.add("Rabbit");
>          animals.add("Snake");
>          animals.add("Parrot");
>       }
>       return animals;
>    }
> }
> 	
> Pages.xhtml is defined as followed:
> Code:
> <pages xmlns="http://jboss.com/products/seam/pages"
>        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>        xsi:schemaLocation="http://jboss.com/products/seam/pages http://jboss.com/products/seam/pages-2.0.xsd">
>    <page view-id="/pageOne.xhtml">
>       <begin-conversation join="true" pageflow="navigation" />
>    </page>
> 	<page view-id="/animalPage.xhtml" action="#{navigation.animalOutcome}">
> 		<navigation>
> 		    <rule if-outcome="Dog">
> 			<redirect view-id="/animal/dog.xhtml"/>
> 		    </rule>
> 		    <rule if-outcome="Cat">
> 			<redirect view-id="/animal/cat.xhtml"/>
> 		    </rule>
> 		    <rule if-outcome="Goldfish">
> 			<redirect view-id="/animal/goldfish.xhtml"/>
> 		    </rule>
> 		    <rule if-outcome="Rabbit">
> 			<redirect view-id="/animal/rabbit.xhtml"/>
> 		    </rule>
> 		    <rule if-outcome="Snake">
> 			<redirect view-id="/animal/snake.xhtml"/>
> 		    </rule>
> 		    <rule if-outcome="Parrot">
> 			<redirect view-id="/animal/parrot.xhtml"/>
> 		    </rule>
> 		</navigation>
> 	</page>
>   
> </pages>
> 	
> The pageflow is defined as:
> Code:
> <pageflow-definition 
> 	xmlns="http://jboss.com/products/seam/pageflow"
> 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>     	xsi:schemaLocation="http://jboss.com/products/seam/pageflow http://jboss.com/products/seam/pageflow-2.0.xsd"
> 	name="navigation">
>    
>    <start-page name="displayChoice" view-id="/pageOne.xhtml">
>       <redirect/>
>       <transition name="next" to="animalPage" />
>    </start-page>
>    <page name="animalPage" view-id="/animalPage.xhtml">
>       <end-conversation/>
>       <redirect/>
>    </page>
>    
> </pageflow-definition>
> 	
> And finally the pageOne.xhtml:
> Code:
> <html xmlns="http://www.w3.org/1999/xhtml"
>       xmlns:c="http://java.sun.com/jstl/core"
> 	  xmlns:ui="http://java.sun.com/jsf/facelets"
> 	  xmlns:h="http://java.sun.com/jsf/html"
> 	  xmlns:f="http://java.sun.com/jsf/core"
>       	  xmlns:s="http://jboss.com/products/seam/taglib">
>    <head>
>       <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
>       <title>Test Navigation</title>
>    </head>
>    <body>
>       <div id="container">
> 	   <h3>Choose an animal</h3>
> 	   <h:form>
> 		<h:selectOneMenu value="#{user.pet}">
> 			<s:selectItems value="#{animals}" var="animal" label="#{animal}" noSelectionLabel="Select your pet"/>
> 		</h:selectOneMenu>
> 		<h:commandButton value="Go To Pet Page" action="next" />
> 	   </h:form>
>       </div>
>    </body>
> </html>
> 	
> When I select an animal, I get the following stacktrace:
> Code:
> INFO: Added Library from: jar:file:/C:/Jboss/jboss-4.2.0.GA/server/default/tmp/d
> eploy/tmp50163navigation.ear-contents/navigation-exp.war/WEB-INF/lib/jsf-facelet
> s.jar!/META-INF/jstl-core.taglib.xml
> 13:23:07,046 INFO  [Navigation] ********* Outcome: Cat
> 13:23:07,218 INFO  [Navigation] ********* Outcome: Cat
> 13:23:07,281 INFO  [Navigation] ********* Outcome: Cat
> 13:23:07,359 INFO  [Navigation] ********* Outcome: Cat
> 13:23:07,437 INFO  [Navigation] ********* Outcome: Cat
> 13:23:07,515 INFO  [Navigation] ********* Outcome: Cat
> 13:23:07,609 INFO  [Navigation] ********* Outcome: Cat
> 13:23:07,687 INFO  [Navigation] ********* Outcome: Cat
> 13:23:07,781 INFO  [Navigation] ********* Outcome: Cat
> 13:23:07,859 INFO  [Navigation] ********* Outcome: Cat
> 1:
> Code:
> <page view-id="/animalPage.xhtml">
> 	<navigation evaluate="#{navigation.outcome}">
> ...
> 	
> where #{navigation.outcome} returns outcome
> -> redirection to /animalPage.xhtml (which doesn't exist) because evaluate EL expression is never called
> 2:
> Code:
> <page view-id="/animalPage.xhtml" action="#{navigation.animalOutcome}">
> 	<navigation evaluate="#{navigation.outcome}">
> ...
> 	
> where #{navigation.animalOutcome} returns void and #{navigation.outcome} returns outcome
> -> We enter a loop where action expression is called then evaluate expression is called, etc....
> 3:
> Code:
> <page view-id="/animalPage.xhtml" action="#{navigation.animalOutcome}">
> 	<navigation from-action="#{navigation.animalOutcome}">
> ...
> 	
> where #{navigation.animalOutcome} returns outcome
> -> We enter a loop where action expression is called indefinitely
> 4:
> Code:
> <page view-id="/animalPage.xhtml" action="#{navigation.animalOutcome}">
> 	<navigation>
> ...
> 	
> where #{navigation.animalOutcome} returns outcome
> -> We enter a loop where action expression is called indefinitely

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