I have been using JRuby in Rails while developing a small demo of
using GemStone persistence in place of ActiveRecord. I found that
detaching the runtime by sticking the runtime in a thread local
'currentInstance' did not quite do the trick.
It seemd to work fine in plain old Ruby scripts, but Rails apparently
uses runtimes differently. In particular, it looks like RubyNil's
getRuntime() gets called in a thread that does not have a thread
local runtime. So I put in lazy initialization (using a default
instance of runtime) in the Ruby.getCurrentInstance() method and that
fixed it. Can anyone explain the workings of Rails and how (and when)
it creates or uses runtimes? I think I will need some pointers to get
this right.
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