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Message-ID: <44C10FF9.8010708@oliver-heger.de>
Date: Fri, 21 Jul 2006 19:33:45 +0200
From: Oliver Heger <oliver.heger@oliver-heger.de>
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To: Jakarta Commons Users List <commons-user@jakarta.apache.org>
Subject: Re: [configuration]  PropertiesConfiguration 1.2: infinite loop in
 property interpolation -- Bug?
References: 
 <512D8032B0DA7E4F8B06BD3F33C4F3FE32CD56@S01B1F4N.rzud.urdorf.ubs.ch>
In-Reply-To: 
 <512D8032B0DA7E4F8B06BD3F33C4F3FE32CD56@S01B1F4N.rzud.urdorf.ubs.ch>
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beat.hess@ubs.com wrote:
> suppose the property
> 
> == PROPERTY FILE STARTS
> test = ${a}${a}${a}
> == PROPERTY FILE ENDS
> 
> where ${a} is not defined.
> 
> If I'm using PropertiesConfiguration.getString("test"), the exception 
> "unhandled exception: infinite loop in property interpolation of
> ${a}${a}${a}: a->a"
> is thrown.
> 
> In my application, ${a} is undefined in the first servlet call, but
> defined
> in the second call.
> 
> As a work around, I had to introduce some helper variables:
> 
> == PROPERTY FILE STARTS
> a1 = ${a}
> a2 = ${a}
> a3 = ${a}
> test = ${a1}${a2}${a3}
> == PROPERTY FILE ENDS
> 
> Would be nice, if this could be fixed some time.
> 
> Cheers, Beat
> 

Beat,

thanks for spotting this.

In [Commons Lang] there is a class VariableFormatter, which deals with 
similar variable substitution stuff, but was not released yet. This 
class is more powerful and should be able to handle your situation. When 
this class gets released I plan to use it for [configuration]'s 
interpolation mechanism. So this problem should be solved then.

Oliver

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