Warnings when headless in the CI

[wendigo]

When mvnd is used with a mvnw (wrapper) in the Github Actions it generates a warning that can't be disabled:

Jun 17, 2024 3:20:16 PM org.jline.utils.Log logr
WARNING: Unable to create a system terminal, creating a dumb terminal (enable debug logging for more information)
[main] WARNING org.jline - Unable to create a system terminal, creating a dumb terminal (enable debug logging for more information)

[cstamas]

This message is coming from jline: https://github.com/jline/jline3/blob/de8243b895e38f81606c44afa3ee0217441c06da/terminal/src/main/java/org/jline/terminal/TerminalBuilder.java#L459

[HannesWell]

I found out that one can enforce the usage of a dump terminal to suppress this warning by specifing the environment variable TERM='dumb'.

Specifying MAVEN_OPTS='-Dorg.jline.terminal.type=dumb' unfortunately didn't work somehow.
Edit: It looks like Maven-Daemon doesn't support MAVEN_OPTS at all: #572

It would be ideal if Maven-Daemon would detect automatically that it's running in a CI environment (e.g. by checking if the environment variable CI is specified) and then would automatically configure JLine accordingly. Or even if JLine would do it itself.

[laeubi]

Should -B not be the option to enable a (dumb) terminal?