When using sbt with forking (fork in run := true), every output from my application to stdout is prefixed by [info]; output to stderr is prefixed with [error].

This behavior is somewhat annoying when using a Java logging framework which outputs to stderr. The resulting debug messages typically look like this:

[error] [main] INFO MyClass ...
[error] [main] DEBUG MyClass ...

I would like to suppress these prefixes like when running the code without forking. What I tried:

  • setting sbt -Dsbt.log.noformat=true in the sbt launch script. But this only removes colored ANSI output; prefixes are still there just without color
  • setting logLevel in run := Level.Error in build.sbt. This does not seem to have any influence on logging with forking.

Is there any way to suppress the prefixes?

scala logging sbt
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