```
>  Dir.foreach("/var/empty", encoding: Encoding.find("filesystem")).to_a # => [".", ".."]
Traceback (most recent call last):
       16: from org.jruby.dist/org.jruby.RubyEnumerable.to_a(RubyEnumerable.java:493)
       15: from org.jruby.dist/org.jruby.RubyEnumerable.callEach(RubyEnumerable.java:98)
       14: from org.jruby.dist/org.jruby.runtime.Helpers.invoke(Helpers.java:442)
       13: from org.jruby.dist/org.jruby.RubyClass.finvoke(RubyClass.java:487)
       12: from org.jruby.dist/org.jruby.RubyClass.finvokeWithRefinements(RubyClass.java:497)
       11: from org.jruby.dist/org.jruby.RubyEnumerator$INVOKER$i$each.call(RubyEnumerator$INVOKER$i$each.gen)
       10: from org.jruby.dist/org.jruby.RubyEnumerator.each(RubyEnumerator.java:396)
        9: from org.jruby.dist/org.jruby.RubyEnumerator.__each__(RubyEnumerator.java:400)
        8: from org.jruby.dist/org.jruby.RubyBasicObject.callMethod(RubyBasicObject.java:393)
        7: from org.jruby.dist/org.jruby.runtime.Helpers.invoke(Helpers.java:454)
        6: from org.jruby.dist/org.jruby.RubyClass.finvoke(RubyClass.java:502)
        5: from org.jruby.dist/org.jruby.RubyClass.finvokeWithRefinements(RubyClass.java:514)
        4: from org.jruby.dist/org.jruby.internal.runtime.methods.JavaMethod$JavaMethodOneOrTwoBlock.call(JavaMethod.java:683)
        3: from org.jruby.dist/org.jruby.RubyDir$INVOKER$s$foreach.call(RubyDir$INVOKER$s$foreach.gen)
        2: from org.jruby.dist/org.jruby.RubyDir.foreach(RubyDir.java:520)
        1: from org.jruby.dist/org.jruby.RubyDir.getEncodingFromOpts(RubyDir.java:530)
Java::JavaLang::ClassCastException (class org.jruby.RubyNil cannot be cast to class org.jruby.RubyHash (org.jruby.RubyNil and org.jruby.RubyHash are in module org.jruby.dist of loader 'app'))
```