[jruby-user] How do I fix RuntimeException: callback-style handles are no longer supported in JRuby?

I am using jdk 1.8, but I have errors with the jruby code
concerning collections and sorting. I had jruby 1.6.3, so I upgraded to
jruby 1.7.19.  But now I can't run the rake db:migrate command. I get
this error:

rake aborted!
load error: fast_xs -- java.lang.RuntimeException: callback-style
handles are no longer supported in JRuby

So I have 2 questions:
Which version of jruby should I use with jdk 1.8?
What does the exception "callback-style handles are no longer supported
in JRuby" mean? I'm not sure to what it is referring.

Thanks in advance for your help.

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