Inconsistent behavior of Nokogiri 1.5.0 Java

[rubiii]

Running the following code:

require "rubygems"
require "nokogiri"

class Document < Nokogiri::XML::SAX::Document; end

document = Document.new
parser = Nokogiri::XML::SAX::Parser.new document
parser.parse(" ")

results in the following error:

RuntimeError: couldn't parse document: Premature end of file.
    parse_with at nokogiri/XmlSaxParserContext.java:252
  parse_memory at /Users/me/.rvm/gems/jruby-1.6.5/gems/nokogiri-1.5.0-java/lib/nokogiri/xml/sax/parser.rb:110
         parse at /Users/me/.rvm/gems/jruby-1.6.5/gems/nokogiri-1.5.0-java/lib/nokogiri/xml/sax/parser.rb:83
        (root) at /Users/me/gh/nokogiri_java_test.rb:8

This does not happen with Nokogiri 1.4.x (JRuby) and Nokogiri 1.5.0 (MRI).
Noticed this while running the specs for a project of mine.

[yokolet]

I fixed the issue in rev. f325a09

This is not a simple bug though it looks really simple. The reason is Nokogiri accepts various types of inputs, also Java API doesn't have any method to know how many bytes are read during parsing. There's no consistent way to know a given document has whitespace(s) only or empty document. Java parser raises the same exception for both whitespace(s) only and empty documents. Only when given input is a string, Nokogiri counts the size before parsing. If the size is less than 1, Nokogiri raises exception. So, this reported case, won't raise exception.