The backtick operator in Ruby (e.g. `date`) executes a system command.
In Jruby 1.5.3 this is not working and in my example caused some odd side effects. This is a known issue (http://jira.codehaus.org/browse/JRUBY-5133) that I'm sure will be fixed in the next release.
For now, use Jruby 1.4.1 as backticks seem to work fine here.
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