When you run ./gradlew in your Term, it sometimes spawns a few java utilities, like the linter. On OS X, these java utilities greet you with an annoying Java icon that appears and never disappears in your Dock, plus you lose focus on your Term.
To hide this icon forever (for all java apps started from your shell), add this line to your ~/.bashrc or ~/.zshrc:
export JAVA_TOOL_OPTIONS="-Dapple.awt.UIElement=true"