The below tests failed.
org.jivesoftware.smack.util.PacketParserUtilsTest
singleMessageBodyTest
singleMessageSubjectTest
multipleMessageBodiesTest
multipleMessageSubjectsTest

the first one in Locale.getAvailableLocales() is an Locale with no language code(empty string), which failed the test.(Also for old versions)
Tested in oracle JDK8_u5 x64 + windows.
http://docs.oracle.com/javase/7/docs/api/java/util/Locale.html#forLanguageTag(ja va.lang.String)
The language code "und" is mapped to language "".