[ajug-members] multiple jar versionsfor one application

[Les Hazlewood]

You cannot do this unless the jars are loaded by two different classloaders
that are both visible to the current application.  Classloader priority can
change depending on your deployment platform (JBoss, Geronimo, etc).

If you're not using a 'platform' like the above, and just using the normal
JVM, this isn't possible.  In this case, the first jar found in the JVM's
classpath will be used to satisfy the dependency and the other identical
fully qualified class name will be ignored.

Regards,

Les

On Thu, May 1, 2008 at 10:25 AM, Chris Abney <Chris.Abney at theice.com> wrote:

> Does any one know of a good way to access multiple versions of the same
> Jar file from one application.
>
> For example:
>
>
> public class myClass {
> :
>   public void doIt() {
>      org.chrisabney.functors.WorkerBee daddyBee = new
> org.chrisabney.functors.WorkerBee();  //The older version
>      org.chrisabney.functors.WorkerBee sonBee   = new
> org.chrisabney.functors.WorkerBee();  //The newer version
>
>      daddyBee.doIt(); //The old boring way
>      sonBee.doIt();   //The new wacky way
>   }
> }
>
>
>
>
> Chris Abney
>
>
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