I wrote a test, which deploys 2 .rar archives and tries to activate objects from both archives.
Test doesn't pass. Seems, it can find objects by jndi names, if they were deployed in .rar together with test, but it can't find objects from another archive.
Probably, there is a class loading problem.
Test org.jboss.as.test.smoke.embedded.deployment.rar.examples.IronJacamarMultipleActivationTestCase.java
is in my branch https://github.com/vratsel/jboss-as/commit/a694b08fd04d8b70729a019b5b72e68cf5b20a7b.