HyukjinKwon edited a comment on issue #25133: [SPARK-28365][ML] Fallback locale to en_US in StopWordsRemover if system default locale isn't in available locales in JVM URL: https://github.com/apache/spark/pull/25133#issuecomment-511247541 Seems like some locales like `en-TW` or `pl-US` is not available in Java - https://www.oracle.com/technetwork/java/javase/java8locales-2095355.html . Seems like not all locales are supported and in this cases the locale seems to be a undefined locale: ```scala scala> val locale = java.util.Locale.forLanguageTag("a") locale: java.util.Locale = scala> java.text.NumberFormat.getInstance(locale).format(12345) res1: String = 12,345 ``` If the locale isn't available in JVM users have to manually change system or JVM locale, or access to private property in PySpark (`_jvm`) to use this particular API. For instance, if the locale specifies, " an English-speaking, Taiwanese locale." which I believe is a legitimate locale but not available in JVM, it seems not going to work. I found one [StackOverFlow question](https://stackoverflow.com/questions/55246080/pyspark-stopwordsremover-parameter-locale-given-invalid-value) about `pl-US`. In addition, I found one similar fix (`https://github.com/godotengine/godot/pull/6910`) in this case.
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