[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-3836) NPE in parameter conversion after rule redirect: valueExpression.getType returns null!

[Francisco Jose Peredo Noguez (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBSEAM-3836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12442235#action_12442235 ] 

Francisco Jose Peredo Noguez commented on JBSEAM-3836:
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I wonder... isn't Seam trying to be too smart for its own sake? Why does it try to guess the type of an EL expression like "#{categoriaBienCveCategoriaFor}? Why not just wait until it needs to evaluate it, and the ask for then ask for type of the resulting value?

> NPE in parameter conversion after rule redirect: valueExpression.getType returns null!
> --------------------------------------------------------------------------------------
>
>                 Key: JBSEAM-3836
>                 URL: https://jira.jboss.org/jira/browse/JBSEAM-3836
>             Project: Seam
>          Issue Type: Bug
>    Affects Versions: 2.1.0.SP1
>            Reporter: Francisco Jose Peredo Noguez
>
> I am getting this WARNING in my logs: 
> WARN  org.jboss.seam.navigation.Param - could not create converter for: categoriaBienCveCategoria
> java.lang.NullPointerException
> 	at org.jboss.seam.jsf.SeamApplication$ConverterLocator.locateConverter(SeamApplication.java:166) [jboss-seam.jar:2.1.0.SP1]
> (The full stacktrace is available in the referenced  forum thread)
> This happens when I hit a navigation rule like this:
> <rule if-outcome="persisted" if="#{not empty categoriaBienCveCategoriaFor}">
>         	<end-conversation/>
>         	<redirect view-id="#{categoriaBienFrom}">
>         		<param name="categoriaBienCveCategoria" value="#{categoriaBienCveCategoriaFor}"/>
>         		<param name="categoriaBienFrom" value="/Crud/CategoriaBien/CategoriaBienList.xhtml"/>        		
>         	</redirect>
> 		</rule>
> As a side effect the categoriaBienCveCategoria is not set with the value in #{categoriaBienCveCategoriaFor}, and that makes my validation rule useless.
> But I found a weird workaround, if I change:
> <param name="categoriaBienCveCategoria" value="#{categoriaBienCveCategoriaFor}"/>
> to
> <param name="categoriaBienCveCategoria" value="#{categoriaBienCveCategoriaFor+0}"/>
> Everything works fine (and the WARN dissapears) I think this is a bug in the way Seam 2.1.0SP1 is dealing with conversions.
> In org.jboss.seam.navigation.Param.getConverter() the call valueExpression.getType() is returning null for #{categoriaBienCveCategoriaFor} 

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