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Apache Dubbo Component

Java SDK (apache/dubbo)

Dubbo Version

dubbo java 3.3.2
jdk 21
windows idea

Steps to reproduce this issue

@OverRide
public List locales() {
List locales = this.locales;
if (locales == null) {
locales = HttpUtils.parseAcceptLanguage(headers.getFirst(HttpHeaderNames.CONTENT_LANGUAGE.getKey()));
if (locales.isEmpty()) {
locales.add(Locale.getDefault());
}
this.locales = locales;
}
return locales;
}
public static List parseAcceptLanguage(String header) {
List<Item> locales = new ArrayList<>();
if (header == null) {
return Collections.emptyList();
}
for (String item : StringUtils.tokenize(header, ',')) {
String[] pair = StringUtils.tokenize(item, ';');
locales.add(new Item<>(parseLocale(pair[0]), pair.length > 1 ? Float.parseFloat(pair[1]) : 1.0F));
}
return Item.sortAndGet(locales);
}

Collections.emptyList() is final

if Collections.emptyList()
locales.add(Locale.getDefault()) throw exception

What you expected to happen

no exception

Anything else

No response

Are you willing to submit a pull request to fix on your own?

• Yes I am willing to submit a pull request on my own!

Code of Conduct

• I agree to follow this project's Code of Conduct