I recently installed jolokia and jmx4perl on two VMs - both Ubuntu 10.04. On the one machine it works alright, on the other machine I get: me@my-machine:~$ j4psh http://localhost:8080/jolokia/version Can't use string ("6.1") as a HASH ref while "strict refs" in use at /usr/local/share/perl/5.10.1/JMX/Jmx4Perl/J4psh.pm line 203. Someone any idea about this? Any help appreciated, thx in advance Dirk