You are a couple a clicks away ;)
http://community.jboss.org/wiki/READTHISFIRSTIntegrationwithSpringandProjectSnowdrop
Relevant in your case:
https://issues.jboss.org/browse/SNOWDROP-4
Although you don't do classpath scanning, the contextConfigLocation is using a wildcard classpath, which typically results in the same issues.
The relevant bits from the Snowdrop doc are:
http://docs.jboss.org/snowdrop/1.0.1/html/ch02.html#d0e70
BTW, I didn't ask you, but you seem to be using Spring 2.5.6 - is that correct?