For several I was convinced that the application deployment process implemented by WebSphere was the worst-performing in the world. Well, that happened until I met JBoss AS 6. In order to properly deploy an application JBoss simply explodes all of its JARs into a temporary folder, “$JBOSS_HOME/server/<server>/tmp”. This is a known JBoss bug, more details can be found here: https://issues.jboss.org/browse/JBAS-8786.
Depending on the footprint of your application tens of JAR files will be unpacked into the aforementioned folder every time you deploy ...
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