Singleton bean creation not allowed while the singletons of this factory are in destruction

What worked for me:
Ref: http://forums.alfresco.com/en/viewtopic.php?f=8&t=27622

Was using openJDK.
Changed to Sun JDK 1.6.0_24.
http://www.cyberciti.biz/faq/howto-ubuntu-linux-install-configure-jdk-jre/ - to change the JDK. I had already installed both JDKs earlier. Just that the default was openJDK.
Exception gone.