使用readChar()后JLine不显示字符

import org.jline.reader.EndOfFileException;
import org.jline.reader.LineReader;
import org.jline.reader.LineReaderBuilder;
import org.jline.reader.UserInterruptException;
import org.jline.terminal.Terminal;
import org.jline.terminal.TerminalBuilder;

public class JLineExample {
    public static void main(String[] args) {
        try {
            Terminal terminal = TerminalBuilder.builder()
                    .system(true)
                    .build();
            LineReader reader = LineReaderBuilder.builder()
                    .terminal(terminal)
                    .build();

            String line;
            while ((line = reader.readLine("> ")) != null) {
                System.out.println("You entered: " + line);
            }
        } catch (UserInterruptException e) {
            System.out.println("Interrupted");
        } catch (EndOfFileException e) {
            System.out.println("EOF");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}