JRuby hangs parsing "&"

[bhollis]

Under JRuby 1.7.2 this:

Nokogiri::XML("&")

Will cause JRuby to hang in some sort of infinite loop until you get a java.lang.OutOfMemoryError. It can actually be any entity reference, not necessarily &. I know it's not valid XML, but I'd rather get an error or an empty document than hang the JVM.