I'm opening this issue because nobody was able to answer my question in the discussions section. So, I strongly believe this is an issue of the JBoss 7.

Let's to the issue: ctx.getCallerPrincipal() should work in the same way, no matter if it was a remote or a local lookup. For more details and an source code example, please see this thread: https://community.jboss.org/thread/202291