setting JAVA_TOOL_OPTIONS is required before mvn build package

[matlads]

I got this building

Reason: The system default encoding must be UTF-8 (add '-Dfile.encoding=UTF-8' the JVM command line). Current value=US-ASCII

The solution was to execute the following before building

export JAVA_TOOL_OPTIONS="-Dfile.encoding=UTF8"

Maybe the build pipeline could be adjusted to include this?

[rijnb]

Thanks!
The Maven POM already included:

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

But in rare cases a command-line build might still fail indeed. I've added a comment to the README to instruct people to add export JAVA_TOOL_OPTIONS="-Dfile.encoding=UTF8" to their .profile or .bashrc.

And the build system, the Travis build YAML file is updated to include this as well.
Assuming this addresses your issue sufficiently, I close it. Re-open if I missed something please.