Why is my backtrace being filtered?

I am experiencing an exception in a third party library. For some reason, the backtrace is skipping a lot of lines. I put this in an initializer:

Rails.backtrace_cleaner.remove_silencers!
Rails.backtrace_cleaner.remove_filters!

      

        
        
        
      

    

These lines have no effect.

What else can affect the content of the return line? Is there a global object that I can inspect, or a method call that I can find in suspicious gems?

I am using JRuby, Rails 4.1 and the corresponding library is dullard .

further explanation

here is an example of how reverse traces usually work. This code ...

def a
  raise "i am in a"
end

def b
  puts "i am in b"
  a
end

def c
  puts "i am in c"
  b
end

c

      

        
        
        
      

    

outputs this result ...

➔ ruby exceptiontest.rb
i am in c
i am in b
exceptiontest.rb:2:in `a': i am in a (RuntimeError)
    from exceptiontest.rb:7:in `b'
    from exceptiontest.rb:12:in `c'
    from exceptiontest.rb:15:in `<main>'

      

        
        
        
      

    

with my problem, I am getting this output ...

➔ ruby exceptiontest.rb
i am in c
i am in b
exceptiontest.rb:2:in `a': i am in a (RuntimeError)
    from exceptiontest.rb:15:in `<main>'