getRuntime question

[Mr.David Shapiro]

I have a binary from another company I kick off within my java program that is supposed to write to a log file. It creates the log file, but does not show anything to the screen. If I add redirecting of stderr to stdout (i.e., 2>&1) to the command I run, I see I am guessing stderr lines to my stdout, but the log does not get anything added until around 4099 bytes. If I run the command normally outside of my program by the way it writes to the log immediate and to stdout. Am I using the wrong method to display lines the lines from getRuntime? Here is a snippet of code I use:

    public String runExec(String c, boolean stdout, boolean stderr,boolean shell) {
                String result = null;
                String s = null;
                this.al.clear();
                Runtime r = Runtime.getRuntime();
                Process p = null;
                try {
                        if (this.DEBUG) {
                                System.out.println("c: " + c);
                                System.out.println("shell: " + shell);
                        }
 
                        // if command needs a shell, use this
                        if (shell == true) {
                                try {
                                        p = r.exec(new String[] {"/bin/ksh", c} );
                                } catch (Exception e) {
                                        System.out.println("Error executing command in runExec. rc= " + p.exitValue());
                                }
                        // otherwise, just run command, but pass in environment
                        } else {
                                for (int i = 0; i < env.length; i++) {
                                        if (this.DEBUG) {
                                                System.out.println("env: " + env[i]);
                                        }
                                }
                                try {
                                        p = r.exec(c, this.env);
                                } catch (Exception e) {
                                        System.out.println("Error executing command in runExec. rc= " + p.exitValue());
                                }
                        }
 
                        /*
                        Available with Java 1.5
                        Process p = new java.lang.ProcessBuilder(c).start();
                        */
 
                        BufferedReader stdInput = new BufferedReader(
                                new InputStreamReader(
                                        p.getInputStream()
                                )
                        );
                        BufferedReader stdError = new BufferedReader(
                                new InputStreamReader(
                                        p.getErrorStream()
                                )
                        );
                        // read the output from the command
                        while ((s = stdInput.readLine()) != null) {
                                this.al.add(s);
                                if (stdout) {
                                        System.out.println(s);
                                }
 
                         }
                        // read any errors from the attempted command
                        while ((s = stdError.readLine()) != null) {
                                if (stderr) {
                                        System.out.println(s);
                                }
                        }
                } catch (IOException e) {
                 e.printStackTrace();
                                System.exit(-1);
                }
                return ArrayListToString(this.al);
    }