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Jar Locking

Jar Locking

2006-08-31       - By Stephen McConnell
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> -----Original Message-----
> From: Marc Farrow [mailto:marc.farrow@(protected)]
> Sent: Thursday, 31 August 2006 6:13 AM
> To: ant-user
> Subject: Jar Locking
>
> Everytime I run an ant task (either in NetBeans or from
> within Java Code), the executing jar gets locked and I cannot
> delete the jar.  I am copying the ant script and the
> dependent jar that it needs to run and then executing the ant
> tasks.  Then I wish to delete the "new" copy I just created
> to run, but a jar I am using is locked and will not allow me.
>  This in on a Windows 2000 machine.

The jar file is locked because it is referenced in a classloader.  The lock
will be released once the classloader is garbage collected but that will not
happen until all references to all classes defined by the jar are no longer
referenced.  If the jar file in question is referenced by Ant then chances
are that your file will not be released until the Ant Project instance is no
longer in use.

The solution to the problem is to handle the creation and updating
operations under two distinct projects.  One project handles the creation of
a new jar file, and the second project handles the replication of the jar
(with the assumption that your second project does not include a classpath
reference to the jar file).

Cheers, Steve.


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