[news.eclipse.platform] classes appearing twice in my plugin

[Derek <subs@xxxxxxxxxxxxxxxxxxxxx>]

Hi,

I have just noticed that all of the classes in my plugins are appearing 
twice in the plugin.jar. For example, my com.xyz.plugin.jar contains
bin
|- com
 |- xyz
  |- plugin
   |- Activator.class
com
|- xyz
 |- plugin
  |- Activator.class

That is, it contains the same .class files in both 
bin/com/xyz/plugin/... AND com/xyz/plugin/...

Any ideas why this is happening?

Thanks
--
Derek