Hello Bas Ven,
For your first post could you check in your jboss management (http://127.0.0.1:9990/management) to make sure that the Commander factory is indeed registered with JNDI. Also for sportsclub, I am not sure where you downloaded the sportsclub example, but you could try from here: https://github.com/snowdrop/snowdrop-examples/tree/master/sportsclub (with the spring version you are using), these are the most up to date.
As for the spring jars conflicting, you could try adding a jboss-deployment-structure.xml file in your WEB-INF dir, with contents:
<jboss-deployment-structure xmlns="urn:jboss:deployment-structure:1.0">
<deployment>
<exclusions>
<module name="org.springframework.spring" slot="snowdrop"/>
</exclusions>
</deployment>
</jboss-deployment-structure>
Cheers,
Tejas M.