How to run exec in the same tty?

For some few days I’ve got a little issue with Gradle. When I’am running Gradle build from tty (for example in iTerm with oh-my-zsh), in which I’am invoking some other console commands, I was expecting that all invoked processes will be running also in this tty… But they are not! The output from such process is not even colored…
exec {
commandLine “tty”
produces output like: “is not a tty”. Have anyone idea, how to fix that?