I've got a sample app to test locale : import java.util.Locale; public class TestLocales { public static void main(String args[]) { Locale[] lLocs = Locale.getAvailableLocales(); for (Locale lLoc: lLocs) { System.out.println(lLoc); } } } When I run it on OpenJDK 1.7 (32/64/OS-X), here is what I get : sun/text/resources/ ar be With OS/X 1.6 VM : ja_JP es_PE en ja_JP_JP es_PA sr_BA mk es_GT ar_AE no_NO sq_AL bg ar_IQ ar_YE hu pt_PT el_CY ar_QA mk_MK sv de_CH en_US fi_FI is cs en_MT sl_SI sk_SK it tr_TR zh th ar_SA no en_GB sr_CS lt ro en_NZ no_NO_NY lt_LT es_NI nl ga_IE fr_BE es_ES ar_LB ko fr_CA et_EE ar_KW sr_RS es_US es_MX ar_SD in_ID ru lv es_UY lv_LV iw pt_BR ar_SY hr et es_DO fr_CH hi_IN es_VE ar_BH en_PH ar_TN fi de_AT es nl_NL es_EC zh_TW ar_JO be is_IS es_CO es_CR es_CL ar_EG en_ZA th_TH el_GR it_IT ca hu_HU fr en_IE uk_UA pl_PL fr_LU nl_BE en_IN ca_ES ar_MA es_BO en_AU sr zh_SG pt uk es_SV ru_RU ko_KR vi ar_DZ vi_VN sr_ME sq ar_LY ar zh_CN be_BY zh_HK ja iw_IL bg_BG in mt_MT es_PY sl fr_FR cs_CZ it_CH ro_RO es_PR en_CA de_DE ga de_LU de es_AR sk ms_MY hr_HR en_SG da mt pl ar_OM tr th_TH_TH el ms sv_SE da_DK es_HN Any ideas about this ?