JRuby's "full" backtrace style (investigating a bug)

gistfile1.txt

[] ~/projects/jruby $ jruby -e '[BasicObject.new].flatten!'
NoMethodError: undefined method `respond_to?' for #<BasicObject:0x73846619>
  flatten! at org/jruby/RubyArray.java:2844
     <top> at -e:1

[] ~/projects/jruby $ jruby -Xbacktrace.style=full -e '[BasicObject.new].flatten!'
NoMethodError: undefined method `respond_to?' for #<BasicObject:0x73846619>
           getStackTrace at java/lang/Thread.java:1552
        getBacktraceData at org/jruby/runtime/backtrace/TraceType.java:183
            getBacktrace at org/jruby/runtime/backtrace/TraceType.java:47
        prepareBacktrace at org/jruby/RubyException.java:223
                preRaise at org/jruby/exceptions/RaiseException.java:215
                preRaise at org/jruby/exceptions/RaiseException.java:194
                  <init> at org/jruby/exceptions/RaiseException.java:139
                  <init> at org/jruby/exceptions/RaiseException.java:72
           methodMissing at org/jruby/RubyKernel.java:265
                    call at org/jruby/RubyKernel.java:115
                    call at org/jruby/internal/runtime/methods/DynamicMethod.java:209
       callMethodMissing at org/jruby/runtime/Helpers.java:178
                 finvoke at org/jruby/RubyClass.java:733
                  invoke at org/jruby/runtime/Helpers.java:416
              callMethod at org/jruby/RubyBasicObject.java:372
              respondsTo at org/jruby/RubyBasicObject.java:623
           convertToType at org/jruby/util/TypeConverter.java:67
  convertToTypeWithCheck at org/jruby/util/TypeConverter.java:183
          checkArrayType at org/jruby/RubyBasicObject.java:817
                 flatten at org/jruby/RubyArray.java:2800
            flatten_bang at org/jruby/RubyArray.java:2829
          flatten_bang19 at org/jruby/RubyArray.java:2844
            cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:293
                    call at org/jruby/runtime/callsite/CachingCallSite.java:131
                   <top> at -e:1
     invokeWithArguments at java/lang/invoke/MethodHandle.java:625
                    load at org/jruby/ir/Compiler.java:111
               runScript at org/jruby/Ruby.java:833
               runScript at org/jruby/Ruby.java:822
             runNormally at org/jruby/Ruby.java:752
             runFromMain at org/jruby/Ruby.java:574
           doRunFromMain at org/jruby/Main.java:401
             internalRun at org/jruby/Main.java:296
                     run at org/jruby/Main.java:225
                    main at org/jruby/Main.java:197