plexus-utils version 2.0.5 or higher
plexus-io version 1.0 or higher
plexus-archiever version 1.0 or higher
The combined effect of these three issues can amount to corruption of created archives, missing files in archives or deadlocks. This is predominant on jvm environments running in -server mode, which includes all 64 bit environments.
This bug affects all released versions of maven and all the xAR plugins.