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From "Shyam Koppikar" <vkopp...@tds.net>
Subject Re: Classloader question
Date Tue, 02 Oct 2001 03:20:55 GMT

----- Original Message -----
From: "Geir Magnusson Jr." <geirm@optonline.net>
To: <ant-user@jakarta.apache.org>
Sent: Monday, October 01, 2001 4:16 AM
Subject: Classloader question


> Howdy,
>
> I am trying to get rid of the issues that popped up recently with Ant 1.4
> and Velocity.  I will phrase the question generally...
>
> How do I, in a custom Ant task, dependably access the 'task classloader'?
>
> Here's the issue I believe I am facing.  Suppose I have the following :
>
> <target name="foo">
>
>     <taskdef name="texen"
> classname="org.apache.velocity.texen.ant.TexenTask">
>       <classpath>
>         <pathelement location="../test/texen-classpath/test.jar"/>
>         <path refid="classpath"/>
>       </classpath>
>     </taskdef>
>
>     <texen
>       useClassPath="true"
>       contextProperties="service.props"
>       controlTemplate="Control.vm"
>       outputDirectory="../test/texen-classpath/results"
>       outputFile="report"
>     />
> </target>
>
> Now, in the Texen code, I want to, via a classloader, access the stuff
added
> to the  classpath defined in the <taskdef/>.
>
> What we were doing was something on the order of
>
>   ClassLoader cl = this.getClass().getClassLoader();
>
> But that doesn't fly in 1.4 as it appears that 1.4 delegates upwards for
> classloading (rather than downwards...)  I may have the interpretation of
> the cause  wrong - the symptom is that if you put the jar with Texen (the
> velocity.jar) in the classpath before invoking ant, you get the problem.
If
> you don't, all is fine.
>
> So what I want to do is ensure I always get the 'lower' classloader (or
find
> another solution.)
>
> Thanks.
>
> Geir
>
>
> --
> Geir Magnusson Jr.     geirm@optonline.net
> System and Software Consulting
> "They that can give up essential liberty to obtain a little temporary
safety
> deserve neither liberty nor safety." - Benjamin Franklin
>
>
>


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