Run a command with ProcessBuilder in Java

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Jceks {
    public static void main(String[] args) {
        System.out.println("Hello jceks...");
        System.out.println(Arrays.toString(args));
        try {
            run(args);
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }

    public static void run(String[] command) throws Exception {
        System.out.println(String.join(" ", command));

        int exitCode = 0;
        StringBuilder output = new StringBuilder();
        ProcessBuilder pb = new ProcessBuilder(command);
        pb.redirectErrorStream(true);

        Process p = pb.start();
        exitCode = p.waitFor();

        BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String line;
        while ((line = reader.readLine())!= null) {
            output.append(line + "\n");
        }

        System.out.println(output);
    }
}