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From: Stefan Bodewig <bodewig@apache.org>
To: dev@ant.apache.org
Subject: Re: "OutOfMemoryException: PermGen space" error with Ant?
References: <1340398906.49515.YahooMailNeo@web112710.mail.gq1.yahoo.com>
	<1340406612.1669.YahooMailNeo@web112713.mail.gq1.yahoo.com>
Date: Sun, 24 Jun 2012 10:41:14 +0200
In-Reply-To: <1340406612.1669.YahooMailNeo@web112713.mail.gq1.yahoo.com>
	(Charles Chan's message of "Fri, 22 Jun 2012 16:10:12 -0700 (PDT)")
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On 2012-06-23, Charles Chan wrote:

> I was using dbunit's Ant integration and have a for loop that exports
> a bunch of dataset into many small xml files (less than 5-50kb
> each). After repeating <dbunit> task for ~50 times, I got an
> OutOfMemoryException: PermGen space.

There are several hints about a memory leak in Ant related to not
cleaning up classloaders used for loading typedefs/taskdefs in
subbuilds.  So far we haven't pinned down the problem.

Are you defining the dbunit tasks inside the <for> or are you spawning
new <ant> or <subant> ot <antcall> tasks inside <for> that would do so?
If so you may be able to work around the problem by defining the tasks
inside the main build before the for loop.

The other things you may be leaking are JDBC drivers.  You could try to
load the driver inside the main build explicitly so it never ends up on
any other classloader (<available> should help).

Stefan

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