How to force a jar to use(or the jvm that jar runs in) utf-8 instead of the system’s default encoding

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When you open a file for reading, you need to explicitly specify the encoding you want to use for reading the file:

Reader r = new InputStreamReader(new FileInputStream("myfile"), StandardCharsets.UTF_8);

Then the value of the default platform encoding (which you can change using -Dfile.encoding) no longer matters.

Note:

I would normally recommend to always specify the encoding explicitly for any operation that depends on the standard locale, such as character I/O. Many Java API methods default to the platform encoding, which I consider a bad design, because often the platform encoding is not the right one, plus it may suddenly change (if the user e.g. switches OS locale), breaking your app.

So just always say which encoding you want.

There are some cases where the platform encoding is the right one (such as when opening a file the user just created for you), but they are fairly rare.

Note 2:

java.nio.charset.StandardCharsets was introduced in Java 1.7. For older Java versions, you need to specify the input encoding as a String (ugh). The list of possible encodings depends on the JVM, but every JVM is guaranteed to at least have:

US-ASCII, ISO-8859-1,UTF-8,UTF-16BE,UTF-16LE,UTF-16.

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