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From "Leonardo Uribe (JIRA)" <>
Subject [jira] [Resolved] (MYFACES-3988) An empty tag in a custom tag-lib causes an Exception
Date Thu, 19 Nov 2015 01:43:11 GMT


Leonardo Uribe resolved MYFACES-3988.
       Resolution: Fixed
         Assignee: Leonardo Uribe
    Fix Version/s: 2.2.9

I did a small change, just allow renderer-type and handler-class to receive empty values and
interpret them as null. I think that's enough in this case.

> An empty tag in a custom tag-lib causes an Exception
> ----------------------------------------------------
>                 Key: MYFACES-3988
>                 URL:
>             Project: MyFaces Core
>          Issue Type: Bug
>          Components: JSR-344
>    Affects Versions: 2.2.8
>            Reporter: Christopher Meyer
>            Assignee: Leonardo Uribe
>            Priority: Minor
>             Fix For: 2.2.9
> While developing a custom tag library we added an empty renderer-type tag like this:
> <tag>
>      <tag-name>myinput</tag-name>
>      <component>
>            <component-type>my.test.MyInput</component-type>
>           <renderer-type></renderer-type>
>      </component>
> </tag>
> This causes the following exception:
> Caused by: java.lang.Exception: Value Cannot be Empty
> 	at org.apache.myfaces.view.facelets.compiler.TagLibraryConfigUnmarshallerImpl$LibraryHandler.endElement(
> 	at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
> 	at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
> 	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
> ...
> This appears to be expected based on the code in TagLibraryConfigUnmarshallerImpl. From
what I can see the exception appears to be thrown on elements which are used in another spot.
If any of them are empty they will throw the above exception. Wildfly/Glassfish does not have
the same behavior, so my assumption is they just ignore it.
> Should the MyFaces code be modified to just continue on without the exception, based
on the reference implementation? I can quickly create something if so, I just wanted to bring
this up to the community at large since I don't know the reasoning behind the difference of
the implementations.

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