I found some tickets mentioning that Singletons were broken in the last releases of JBossAS 6 but they were marked as fixed. I checked out the current trunk an hour ago (rev 109826) , built the distribution zip with "./build.sh -P-sources,dist-zip" (no special maven settings in my settings.xml) and unzipped it to my home directory. I tested it with my current project and it failed again. I wrote a little test project to give you my exact setup to reproduce the error. I hope I didn't misused the spec but to my understanding, this testcase should work.

The attached file has an OUTPUT.txt file which contains the log and error message.