[jnigen] Jnigen fails with FormatException again

[glanium]

I've upgraded to jni 0.9.0 and jnigen 0.9.0.
However, I've got same FormatException error as #877

I've investigated the issue and there is one more cause.

https://github.com/dart-lang/native/blob/95d226d290d4d5c583c4e45b04048442f244c656/pkgs/jnigen/java/src/main/java/com/github/dart_lang/jnigen/apisummarizer/Main.java#L63C1-L71C6

When options.outputFile is specified, FileOutputStream is used for output.
This is ok.
However, when options.outputFile is not specified, System.out is used.
This is problem.
System.out is type of PrintStream!
PrintStream is encoding-aware!
So i guess jackson's JsonSerializer outputs json as UTF-16 in ja-JP locale by invoking PrintStream's encoding-aware methods.

thx.

[glanium]

In my machine,
when

java -jar .dart_tool/jnigen/ApiSummarizer.jar -c "jar\okio-3.0.0.jar;jar\okhttp-4.10.0.jar" --backend asm okhttp3.OkHttpClient > test.txt

test.txt is in UTF16-LE

when

java -jar .dart_tool/jnigen/ApiSummarizer.jar -c "jar\okio-3.0.0.jar;jar\okhttp-4.10.0.jar" --backend asm okhttp3.OkHttpClient -o test.txt

using -o option,

test.txt is in UTF8

[HosseinYousefi]

I see, it worked on my machine using ja-JP, that's why I closed it.

I can replace System.out with new PrintStream(System.out, true, StandardCharsets.UTF_8);and try again. I'll tag you in the PR to check it on your machine using git dependency so we're sure this time the issue is actually fixed.