Getting files in a directory using java API from Kubernetes pod

Question

I am trying to get the list of files in a pod directory using this code this

Code I tried:

    import io.kubernetes.client.Exec;
     ..........
    
    Exec exec = new Exec();
            boolean tty = System.console() != null;
            String[] command = {"/bin/sh","-c", "ls", "/var/log"};
    
            final Process proc =
                    exec.exec(namespace, podName, command , false, tty);
    
            BufferedReader in = new BufferedReader(new InputStreamReader(proc.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                System.out.println(line);
            }
   proc.waitFor();
       

        in.close();

but this always output "data", instead of the files in the dir. How can i make it work. If. i try this using kubectl command line this works.