Hi,
Rapidshare currently forbids free file downloads, so I cannot take a look at your sample.
But: as far as I know, you should use this value for "URL_PKG_PREFIXES" in application clients (not "org.jboss.naming:org.jnp.interfaces"):
props.setProperty(Context.URL_PKG_PREFIXES, "org.jboss.naming.client");
Best regards
Wolfgang