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From Jason van Zyl <ja...@zenplex.com>
Subject Re: [Patch ??] [Jelly] java.lang.ClassCastException when using dynamic tags inside a loop
Date Fri, 13 Sep 2002 00:07:18 GMT
On Wed, 2002-09-11 at 17:57, Guido Schmutz wrote:
> Hi,
>  
> In the meantime I was able to debug the problem below and I've tracked it down to the
method run in the class StaticTagScript. In the following line, the variable tag holds a DynamicTag
and not a StaticTag inside a loop (step >= 2), causing the ClassCastException
>  
> tag = findDynamicTag(context, (StaticTag) tag);
>  
> With a instanceof check, the Exception can be avoided:
>  
> if (! (tag instanceof DynamicTag)) {
>      tag = findDynamicTag(context, (StaticTag) tag);
> }
>  
> I know that's not the right way to send patches, but I'm new to Jakarta projects and
CVS and I first have to learn how to do diffs. Additionally I'm also not sure, if I'm really
fixing the problem or if my script is not ok.

Patch applied with a slight modification. Thanks.
  
> Thanks for your help
> Guido
>  
> 
> 	-----Urspr√ľngliche Nachricht----- 
> 	Von: Guido Schmutz 
> 	Gesendet: Mi 11.09.2002 17.53 h 
> 	An: commons-dev@jakarta.apache.org 
> 	Cc: 
> 	Betreff: [Jelly] java.lang.ClassCastException when using dynamic tags inside a loop
> 	
> 	
> 	Hi,
> 	 
> 	I'm getting the following exception
> 	 
> 	Caught exception: java.lang.ClassCastException: org.apache.commons.jelly.impl.DynamicTag
> 	java.lang.ClassCastException: org.apache.commons.jelly.impl.DynamicTag
> 	 at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:113)
> 	 at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:134)
> 	 at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:190)
> 	 at org.apache.commons.jelly.tags.core.WhitespaceTag.doTag(WhitespaceTag.java:94)
> 	 at org.apache.commons.jelly.impl.BeanTagScript.run(BeanTagScript.java:180)
> 	 at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:134)
> 	 at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:190)
> 	 at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:176)
> 	 at org.apache.commons.jelly.impl.BeanTagScript.run(BeanTagScript.java:180)
> 	 at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:134)
> 	 at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:190)
> 	 at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:100)
> 	 at org.apache.commons.jelly.impl.BeanTagScript.run(BeanTagScript.java:180)
> 	 at org.apache.commons.jelly.Jelly.main(Jelly.java:128)
> 	
> 	when executing the following Jelly Script:
> 	 
> 	<?xml version="1.0"?>
> 	<j:jelly xmlns:j="jelly:core" 
> 	          xmlns:b="jelly:betwixt"
> 	          xmlns:x="jelly:xml"
> 	          xmlns:log="jelly:log" 
> 	          xmlns:define="jelly:define"
> 	          xmlns:u="tvdUtil">
> 	 
> 	<define:taglib uri="tvdUtil" trim="true">  
> 	<define:tag name="sep" trim="true">
> 	 <j:choose>
> 	  <j:when test="${index == 1}">${first}</j:when>
> 	  <j:otherwise>${next}</j:otherwise>
> 	 </j:choose></define:tag>
> 	 
> 	</define:taglib>
> 	
> 	<j:forEach begin="1" end="3" indexVar="i">
> 	 <j:whitespace trim="false">
> 	  <u:sep first=";" next="," index="${i}"/> index ${i}
> 	 </j:whitespace>
> 	</j:forEach>
> 	</j:jelly>
> 	
> 	This exception only happens, when there is more than one step in the loop (end >
2).
> 	 
> 	I'm new to Jelly, is there a problem in my script or is it a bug ?
> 	 
> 	Thanks for your help
> 	Guido
> 	 
> 	I
-- 
jvz.

Jason van Zyl
jason@zenplex.com
http://tambora.zenplex.org

In short, man creates for himself a new religion of a rational
and technical order to justify his work and to be justified in it.
  
  -- Jacques Ellul, The Technological Society


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