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Date: Thu, 15 Jan 2004 17:09:05 +0100
From: =?ISO-8859-1?Q?Antoine_L=E9vy-Lambert?= <antoine@antbuild.com>
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To: Ant Developers List <dev@ant.apache.org>
Subject: Re: New Launcher and JPackage RPMs
References: <m3zncp8cip.fsf@bodewig.bost.de> <4006B228.6090702@corvil.com>
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Hi Peter,

can we improve the new classloader so that the work of inspecting the 
jars does not happen each time an <antcall/> is done ?

Antoine
Peter Reilly wrote:

> Stefan Bodewig wrote:
>
>> Hi,
>>
>> today I found myself discussing with the JPackage folks on their list
>> about the problems the RPM setup has with the new Launcher.
>>
>> They put all the installed jars into a single directory and let config
>> files put together the classpath before they invoke Ant IIUC.
>>
>> So far we've told people that the new Launcher would pull in all jars
>> from ANT_HOME/lib (and in addition from ~/.ant/lib, but we didn't say
>> that very loud) - but this is not true.  It pulls in all jars from the
>> directory containing ant-launcher.jar, no matter where it is.
>>
>> In stock installs this is the same, but not in the RPM installation
>> where this behavior pulls in the whole Java universe.
>>  
>>
> This may have performance implications.
> I was looking at slowdowns from 1.5 to 1.6. One issue is
> <typedef resource="cpptasks.tasks"/>
> This is slower in 1.6 than it is in 1.5. This is due to the new
> classloader (I think). The new classloader added the jars in 
> ${ant.home}/lib to the
> classpath and also opens each jar looking for classpath information in 
> it.
> If the <typedef/> is at the top level, this happens each time an 
> ant-call is
> done - so a common idiom causes problems:
>
> <project name="project">
>    <include name="common.xml"/> ( or &common;)    <target 
> name="compile-mains">
>        <foreach list="a,b,c,d,e,f,g,h,i" param="program" 
> target="compile"/>
>    </target>
>    <target name="compile">
>       ....
>    </target>
> </project>
>
>
> Where common.xml contains:
> <taskdef resource="net/sf/antcontrib/antcontrib.properties" />
> <taskdef resource="cpptasks.tasks"/>
> <typedef resource="cpptasks.types"/>
>
> Peter
>
>> I'm not convinced that we need to adjust anything, but it is an
>> interesting thing to note.
>>
>> Stefan
>>
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>>
>>
>>  
>>
>
>
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