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Editorial Team
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Asked: 2026-05-27T04:06:25+00:00

When I type in chinese characters in the REPL, only question marks are displayed,

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When I type in chinese characters in the REPL, only question marks are displayed, as in my second screenshot. How can I fix this? My scala version is 2.9.0.1 and OS windows

before input the Chinese: 中国 using 搜狗输入法

after input

Can't display the Chinese word correctly

Even if I start REPL with a property -Dfile.encoding="UTF-8"

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1 Answer

  1. Editorial Team

    Ah, you’re on Windows. I don’t think this is supported at the moment. I some idea of what’s going on. See https://issues.scala-lang.org/browse/SI-4711 for the investigation.

    The root of the issue is:

    1. jline2 (its jansi dependency) loads a DLL that uses some variant of 8 bits getc to read characters at the console and does not support double byte characters. The API call that could be used instead is ReadConsoleInputW.
    2. The REPL output printing uses the underlying Java System.out which does not print unicode characters reliably – although your first snapshot in your question seems to imply that it works*.

    I’m not part of the Scala team, but I tried to fix it and I may have something working more or less. See https://github.com/fusesource/jansi-native/blame/master/src/main/java/org/fusesource/jansi/internal/WindowsSupport.java (based on WriteConsoleW and ReadConsoleInputW and other additions in the REPL ILoop source – the changes are somewhere in my fork on github – not updated in a while.

    If you are interested, I may be able to provide an experimental fork of the 2.9.0.1 scala-compiler.jar and jline.jar and you could tell me if it works.

    *What is the code that prints :1: xx 2:xx 3:xx 4:x 5:x where x is some chinese character?

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