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Date: Fri, 19 Nov 2004 02:14:37 -0800 (PST)
From: "Marc DeXeT (JIRA)" <commons-dev@jakarta.apache.org>
To: commons-dev@jakarta.apache.org
Subject: 
 =?ISO-8859-1?Q?[jira]_Mis-=E0-jour:_(JELLY-165)_CatchTag_closest_from?=
 =?ISO-8859-1?Q?_java_tryCatch_block_(with_expected_exceptions_list)?=
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     [ http://nagoya.apache.org/jira/browse/JELLY-165?page=history ]

Marc DeXeT updated JELLY-165:
-----------------------------

    Attachment: patchCatchTag.txt

Patch file for catchTag improvement

> CatchTag closest from java tryCatch block (with expected exceptions list)
> -------------------------------------------------------------------------
>
>          Key: JELLY-165
>          URL: http://nagoya.apache.org/jira/browse/JELLY-165
>      Project: jelly
>         Type: Improvement
>   Components: core / taglib.core
>     Versions: 1.0-beta-5
>  Environment: JDK1.4_02 Windows XP Redhat AS 2.1
>     Reporter: Marc DeXeT
>  Attachments: CatchTag.java, catchTagTest.zip, catchTagTest.zip, patchCatchTag.txt
>
> The actual CatchTag doesn't distinct kind of exception. 
> <catch var="e">
>   <doTag/>
> </cacth>
> <if test="${! empty(e)}">
>   <process/>
> </if>
> try { 
>   doTag(); 
> } catch (Throwable t) { 
>   process (); 
> }
> It above all doesn't allow tryCatch nesting. 
> Improvements are following 
> 1) LIST :
> This Tag implements expected exception list. If an unexpected exception is thrown, tag throws it upper.
> So it's possible to get 
> try { 
>   try { 
>     try { 
>       process(); 
>      } catch( exceptionA lower} {
>         doLower();
>      }
>   } catch( exceptionB middle ) {
>       doMidlle();
>   }
> } catch( exceptionC upper) {
>  doUpper();
> }
> 2) Get REAL exception
> As improvement, it implements too dissect exception stack to get the first not Jelly exception and put to context this one.
> 3) Respect exception class parenthood. A assignable exception will be catched if her ancestor is in excpetion list.
> See unit test for more details.

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