JDK 11 in Alpine images cannot read UTF-8 filenames about openjdk-docker

[icecreamhead]

I'm not sure if we have the exact same issue, but my workaround was to override the java tool options with utf-8 file encoding in my dockerfile.

ENV JAVA_TOOL_OPTIONS="-XX:+UseContainerSupport -Dfile.encoding=UTF-8"

[jrudolph]

I'm not sure if we have the exact same issue, but my workaround was to override the java tool options with utf-8 file encoding in my dockerfile.

ENV JAVA_TOOL_OPTIONS="-XX:+UseContainerSupport -Dfile.encoding=UTF-8"

No, this one is different. file.encoding is for file contents while sun.jnu.encoding is for file names.

[jrudolph]

I think, I understand now what's going on.

The adoptopenjdk docker image doesn't really build against musl. Instead, it just uses the precompiled binaries built against standard glibc and then installs some version of glibc into alpine.

musl itself always supports UTF-8 out of the box. So, if adoptopenjdk would be built against musl it would probably support UTF-8 out of the box.

However, if you run with glibc you will need proper glibc locales to support anything other than C which comes with a default encoding of ANSI_X3.4-1968, i.e. basically ASCII.

Proper musl support for adoptopenjdk would probably be interesting as it can make for even smaller images (e.g. there's a Zulu for Alpine release) but let's treat this as out-of-scope for this ticket.

Without going the full way to musl support, what needs to be done is actually quite simple: you need to generate at least one UTF-8 locale and use that as a default. As the current docker files already download glibc packages, the only thing missing would be to also install glibc-i18n and then run localedef -i en_US -f UTF-8 en_US.UTF-8 and set en_US.UTF-8 as the default locale in /etc/profile or as an environment variable (like it was done in #111 for ubuntu).

[stbischof]

Some news on this issue?

[grzesuav]

#111 - does it helps ?

[grzesuav]

I have added (I hope so) UTF-8 to alpine image

[grzesuav]

Thank @jrudolph for explaining, I will try to provide an alpine fix then

[grzesuav]

https://github.com/frol/docker-alpine-glibc/blob/master/Dockerfile will use this as reference

[grzesuav]

#155