Examples of java.lang.Process

java.lang.Process
The {@link ProcessBuilder#start()} and{@link Runtime#exec(String[],String[],File) Runtime.exec}methods create a native process and return an instance of a subclass of Process that can be used to control the process and obtain information about it. The class Process provides methods for performing input from the process, performing output to the process, waiting for the process to complete, checking the exit status of the process, and destroying (killing) the process.
The methods that create processes may not work well for special processes on certain native platforms, such as native windowing processes, daemon processes, Win16/DOS processes on Microsoft Windows, or shell scripts. The created subprocess does not have its own terminal or console. All its standard io (i.e. stdin, stdout, stderr) operations will be redirected to the parent process through three streams ( {@link #getOutputStream()}, {@link #getInputStream()}, {@link #getErrorStream()}). The parent process uses these streams to feed input to and get output from the subprocess. Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the input stream or read the output stream of the subprocess may cause the subprocess to block, and even deadlock.
The subprocess is not killed when there are no more references to the Process object, but rather the subprocess continues executing asynchronously.
There is no requirement that a process represented by a Process object execute asynchronously or concurrently with respect to the Java process that owns the Process object. @author unascribed @version 1.25, 03/30/06 @see ProcessBuilder @see Runtime#exec(String[],String[],File) @since JDK1.0

             */
            Runtime rt = null;
            BufferedReader commandsStdOut = null;
            BufferedReader commandsStdErr = null;
            BufferedOutputStream commandsStdIn = null;
            Process proc = null;
            byte[] bBuf = new byte[1024];
            char[] cBuf = new char[1024];
            int bufRead = -1;


            //create query arguments
            Enumeration paramNames = params.keys();
            StringBuffer cmdAndArgs = new StringBuffer(command);
            if (paramNames != null && paramNames.hasMoreElements()) {
                cmdAndArgs.append(" ");
                while (paramNames.hasMoreElements()) {
                    String k = (String) paramNames.nextElement();
                    String v = params.get(k).toString();
                    if ((k.indexOf("=") < 0) && (v.indexOf("=") < 0)) {
                        cmdAndArgs.append(k);
                        cmdAndArgs.append("=");
                        v = java.net.URLEncoder.encode(v);
                        cmdAndArgs.append(v);
                        cmdAndArgs.append(" ");
                    }
                }
            }


            /*String postIn = getPostInput(params);
            int contentLength = (postIn.length()
                    + System.getProperty("line.separator").length());
            if ("POST".equals(env.get("REQUEST_METHOD"))) {
                env.put("CONTENT_LENGTH", new Integer(contentLength));
            }*/


        StringBuffer perlCommand = new StringBuffer("perl ");
        if (command.endsWith(".pl") || command.endsWith(".cgi")) {
            perlCommand.append(cmdAndArgs.toString());
            cmdAndArgs = perlCommand;
        }


            rt = Runtime.getRuntime();
            proc = rt.exec(cmdAndArgs.toString(), hashToStringArray(env), wd);


            /*
             * provide input to cgi
             * First  -- parameters
             * Second -- any remaining input
             */
            /*commandsStdIn = new BufferedOutputStream(proc.getOutputStream());
            if (debug >= 2 ) {
                log("runCGI stdin=[" + stdin + "], qs="
                    + env.get("QUERY_STRING"));
            }
            if ("POST".equals(env.get("REQUEST_METHOD"))) {
                if (debug >= 2) {
                    log("runCGI: writing ---------------\n");
                    log(postIn);
                    log("runCGI: new content_length=" + contentLength
                        + "---------------\n");
                }
                commandsStdIn.write(postIn.getBytes());
            }
            if (stdin != null) {
                //REMIND: document this
                /* assume if nothing is available after a time, that nothing is
                 * coming...
                 */
                /*if (stdin.available() <= 0) {
                    if (debug >= 2 ) {
                        log("runCGI stdin is NOT available ["
                            + stdin.available() + "]");
                    }
                    try {
                        Thread.currentThread().sleep(iClientInputTimeout);
                    } catch (InterruptedException ignored) {
                    }
                }
                if (stdin.available() > 0) {
                    if (debug >= 2 ) {
                        log("runCGI stdin IS available ["
                            + stdin.available() + "]");
                    }
                    bBuf = new byte[1024];
                    bufRead = -1;
                    try {
                        while ((bufRead = stdin.read(bBuf)) != -1) {
                            if (debug >= 2 ) {
                                log("runCGI: read [" + bufRead
                                    + "] bytes from stdin");
                            }
                            commandsStdIn.write(bBuf, 0, bufRead);
                        }
                        if (debug >= 2 ) {
                            log("runCGI: DONE READING from stdin");
                        }
                    } catch (IOException ioe) {
                        //REMIND: replace with logging
                        //REMIND: should I throw this exception?
                        log("runCGI: couldn't write all bytes.");
                        ioe.printStackTrace();
                    }
                }
            }
            commandsStdIn.flush();
            commandsStdIn.close();*/
      String sContentLength = (String) env.get("CONTENT_LENGTH");
      if(!"".equals(sContentLength)) {
          commandsStdIn = new BufferedOutputStream(proc.getOutputStream());
          byte[] content = new byte[Integer.parseInt(sContentLength)];
          stdin.read(content);
          commandsStdIn.write(content);
          commandsStdIn.flush();
          commandsStdIn.close();
      }


            /* we want to wait for the process to exit,  Process.waitFor()
             * is useless in our situation; see
             * http://developer.java.sun.com/developer/
             *                               bugParade/bugs/4223650.html
             */


            boolean isRunning = true;
            commandsStdOut = new BufferedReader
                (new InputStreamReader(proc.getInputStream()));
            commandsStdErr = new BufferedReader
                (new InputStreamReader(proc.getErrorStream()));
            BufferedWriter servletContainerStdout = null;


            try {
                if (response.getOutputStream() != null) {
                    servletContainerStdout =
                        new BufferedWriter(new OutputStreamWriter
                            (response.getOutputStream()));
                }
            } catch (IOException ignored) {
                //NOOP: no output will be written
            }


            while (isRunning) {


                try {
                    //read stderr first
                    cBuf = new char[1024];
                    while ((bufRead = commandsStdErr.read(cBuf)) != -1) {
                        if (servletContainerStdout != null) {
                            servletContainerStdout.write(cBuf, 0, bufRead);
                        }
                    }


                    //set headers
                    String line = null;
                    while (((line = commandsStdOut.readLine()) != null)
                           && !("".equals(line))) {
                        if (debug >= 2) {
                            log("runCGI: addHeader(\"" + line + "\")");
                        }
                        if (line.startsWith("HTTP")) {
                            //TODO: should set status codes (NPH support)
                            /*
                             * response.setStatus(getStatusCode(line));
                             */
                        } else {
                            response.addHeader
                                (line.substring(0, line.indexOf(":")).trim(),
                                 line.substring(line.indexOf(":") + 1).trim());
                        }
                    }


                    //write output
                    cBuf = new char[1024];
                    while ((bufRead = commandsStdOut.read(cBuf)) != -1) {
                        if (servletContainerStdout != null) {
                            if (debug >= 4) {
                                log("runCGI: write(\"" + cBuf + "\")");
                            }
                            servletContainerStdout.write(cBuf, 0, bufRead);
                        }
                    }


                    if (servletContainerStdout != null) {
                        servletContainerStdout.flush();
                    }


                    proc.exitValue(); // Throws exception if alive


                    isRunning = false;


                } catch (IllegalThreadStateException e) {
                    try {

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             */
            Runtime rt = null;
            BufferedReader commandsStdOut = null;
            BufferedReader commandsStdErr = null;
            BufferedOutputStream commandsStdIn = null;
            Process proc = null;
            byte[] bBuf = new byte[1024];
            char[] cBuf = new char[1024];
            int bufRead = -1;


            //create query arguments
            Enumeration paramNames = params.keys();
            StringBuffer cmdAndArgs = new StringBuffer(command);
            if (paramNames != null && paramNames.hasMoreElements()) {
                cmdAndArgs.append(" ");
                while (paramNames.hasMoreElements()) {
                    String k = (String) paramNames.nextElement();
                    String v = params.get(k).toString();
                    if ((k.indexOf("=") < 0) && (v.indexOf("=") < 0)) {
                        cmdAndArgs.append(k);
                        cmdAndArgs.append("=");
                        v = java.net.URLEncoder.encode(v);
                        cmdAndArgs.append(v);
                        cmdAndArgs.append(" ");
                    }
                }
            }


            /*String postIn = getPostInput(params);
            int contentLength = (postIn.length()
                    + System.getProperty("line.separator").length());
            if ("POST".equals(env.get("REQUEST_METHOD"))) {
                env.put("CONTENT_LENGTH", new Integer(contentLength));
            }*/


        StringBuffer perlCommand = new StringBuffer("perl ");
        if (command.endsWith(".pl") || command.endsWith(".cgi")) {
            perlCommand.append(cmdAndArgs.toString());
            cmdAndArgs = perlCommand;
        }


            rt = Runtime.getRuntime();
            proc = rt.exec(cmdAndArgs.toString(), hashToStringArray(env), wd);


            /*
             * provide input to cgi
             * First  -- parameters
             * Second -- any remaining input
             */
            /*commandsStdIn = new BufferedOutputStream(proc.getOutputStream());
            if (debug >= 2 ) {
                log("runCGI stdin=[" + stdin + "], qs="
                    + env.get("QUERY_STRING"));
            }
            if ("POST".equals(env.get("REQUEST_METHOD"))) {
                if (debug >= 2) {
                    log("runCGI: writing ---------------\n");
                    log(postIn);
                    log("runCGI: new content_length=" + contentLength
                        + "---------------\n");
                }
                commandsStdIn.write(postIn.getBytes());
            }
            if (stdin != null) {
                //REMIND: document this
                /* assume if nothing is available after a time, that nothing is
                 * coming...
                 */
                /*if (stdin.available() <= 0) {
                    if (debug >= 2 ) {
                        log("runCGI stdin is NOT available ["
                            + stdin.available() + "]");
                    }
                    try {
                        Thread.currentThread().sleep(iClientInputTimeout);
                    } catch (InterruptedException ignored) {
                    }
                }
                if (stdin.available() > 0) {
                    if (debug >= 2 ) {
                        log("runCGI stdin IS available ["
                            + stdin.available() + "]");
                    }
                    bBuf = new byte[1024];
                    bufRead = -1;
                    try {
                        while ((bufRead = stdin.read(bBuf)) != -1) {
                            if (debug >= 2 ) {
                                log("runCGI: read [" + bufRead
                                    + "] bytes from stdin");
                            }
                            commandsStdIn.write(bBuf, 0, bufRead);
                        }
                        if (debug >= 2 ) {
                            log("runCGI: DONE READING from stdin");
                        }
                    } catch (IOException ioe) {
                        //REMIND: replace with logging
                        //REMIND: should I throw this exception?
                        log("runCGI: couldn't write all bytes.");
                        ioe.printStackTrace();
                    }
                }
            }
            commandsStdIn.flush();
            commandsStdIn.close();*/
      String sContentLength = (String) env.get("CONTENT_LENGTH");
      if(!"".equals(sContentLength)) {
          commandsStdIn = new BufferedOutputStream(proc.getOutputStream());
          byte[] content = new byte[Integer.parseInt(sContentLength)];
          stdin.read(content);
          commandsStdIn.write(content);
          commandsStdIn.flush();
          commandsStdIn.close();
      }


            /* we want to wait for the process to exit,  Process.waitFor()
             * is useless in our situation; see
             * http://developer.java.sun.com/developer/
             *                               bugParade/bugs/4223650.html
             */


            boolean isRunning = true;
            commandsStdOut = new BufferedReader
                (new InputStreamReader(proc.getInputStream()));
            commandsStdErr = new BufferedReader
                (new InputStreamReader(proc.getErrorStream()));
            BufferedWriter servletContainerStdout = null;


            try {
                if (response.getOutputStream() != null) {
                    servletContainerStdout =
                        new BufferedWriter(new OutputStreamWriter
                            (response.getOutputStream()));
                }
            } catch (IOException ignored) {
                //NOOP: no output will be written
            }


            while (isRunning) {


                try {
                    //read stderr first
                    cBuf = new char[1024];
                    while ((bufRead = commandsStdErr.read(cBuf)) != -1) {
                        if (servletContainerStdout != null) {
                            servletContainerStdout.write(cBuf, 0, bufRead);
                        }
                    }


                    //set headers
                    String line = null;
                    while (((line = commandsStdOut.readLine()) != null)
                           && !("".equals(line))) {
                        if (debug >= 2) {
                            log("runCGI: addHeader(\"" + line + "\")");
                        }
                        if (line.startsWith("HTTP")) {
                            //TODO: should set status codes (NPH support)
                            /*
                             * response.setStatus(getStatusCode(line));
                             */
                        } else {
                            response.addHeader
                                (line.substring(0, line.indexOf(":")).trim(),
                                 line.substring(line.indexOf(":") + 1).trim());
                        }
                    }


                    //write output
                    cBuf = new char[1024];
                    while ((bufRead = commandsStdOut.read(cBuf)) != -1) {
                        if (servletContainerStdout != null) {
                            if (debug >= 4) {
                                log("runCGI: write(\"" + cBuf + "\")");
                            }
                            servletContainerStdout.write(cBuf, 0, bufRead);
                        }
                    }


                    if (servletContainerStdout != null) {
                        servletContainerStdout.flush();
                    }


                    proc.exitValue(); // Throws exception if alive


                    isRunning = false;


                } catch (IllegalThreadStateException e) {
                    try {

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    String command = getQueueInfoCommand[0] + " " + getQueueInfoCommand[1]
        + " " + getQueueInfoCommand[2];
    ProcessBuilder pb = new ProcessBuilder(getQueueInfoCommand);


    Process p = pb.start();


    Timer timeout = new Timer();
    TorqueTimerTask torqueTimerTask = new TorqueTimerTask(p, command);
    timeout.schedule(torqueTimerTask, TorqueTimerTask.timeoutInterval * 1000);


    BufferedReader result = new BufferedReader(new InputStreamReader(p
        .getInputStream()));
    ErStreamHandler errorHandler = new ErStreamHandler(p.getErrorStream(),
        command, true);
    errorHandler.start();


    String line = null;
    boolean start = false;

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    qstatCommand[2] = sb.toString();


    String command = qstatCommand[0] + " " + qstatCommand[1] + " "
        + qstatCommand[2];
    ProcessBuilder pb = new ProcessBuilder(qstatCommand);
    Process p = pb.start();


    Timer timeout = new Timer();
    TorqueTimerTask torqueTimerTask = new TorqueTimerTask(p, command);
    timeout.schedule(torqueTimerTask, TorqueTimerTask.timeoutInterval * 1000);


    BufferedReader result = new BufferedReader(new InputStreamReader(p
        .getInputStream()));
    ErStreamHandler errorHandler = new ErStreamHandler(p.getErrorStream(),
        command, false);
    errorHandler.start();
    String line = null;
    String hosts = null;
    long startTimeValue = -1;

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    String command = traceJobCommand[0] + " " + traceJobCommand[1] + " "
        + traceJobCommand[2];
    ProcessBuilder pb = new ProcessBuilder(traceJobCommand);


    Process p = pb.start();


    Timer timeout = new Timer();
    TorqueTimerTask torqueTimerTask = new TorqueTimerTask(p, command);
    timeout.schedule(torqueTimerTask, TorqueTimerTask.timeoutInterval * 1000);


    BufferedReader result = new BufferedReader(new InputStreamReader(p
        .getInputStream()));
    ErStreamHandler errorHandler = new ErStreamHandler(p.getErrorStream(),
        command, false);
    errorHandler.start();
    String line = null;
    String exit_status = null;
    String hosts = null;

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     */
    Runtime rt = null;
    BufferedReader commandsStdOut = null;
    BufferedReader commandsStdErr = null;
    BufferedOutputStream commandsStdIn = null;
    Process proc = null;
    byte[] bBuf = new byte[1024];
    char[] cBuf = new char[1024];
    int bufRead = -1;


    //create query arguments
    Enumeration paramNames = params.keys();
    StringBuffer cmdAndArgs = new StringBuffer(command);
    if (paramNames != null && paramNames.hasMoreElements()) {
        cmdAndArgs.append(" ");
        while (paramNames.hasMoreElements()) {
            String k = (String) paramNames.nextElement();
            String v = params.get(k).toString();
            if ((k.indexOf("=") < 0) && (v.indexOf("=") < 0)) {
                cmdAndArgs.append(k);
                cmdAndArgs.append("=");
                v = java.net.URLEncoder.encode(v);
                cmdAndArgs.append(v);
                cmdAndArgs.append(" ");
            }
        }
    }


    String postIn = getPostInput(params);
    int contentLength = (postIn.length()
            + System.getProperty("line.separator").length());
    if ("POST".equals(env.get("REQUEST_METHOD"))) {
        env.put("CONTENT_LENGTH", new Integer(contentLength));
    }


    rt = Runtime.getRuntime();
    proc = rt.exec(cmdAndArgs.toString(), hashToStringArray(env), wd);




    /*
     * provide input to cgi
     * First  -- parameters
     * Second -- any remaining input
     */
    commandsStdIn = new BufferedOutputStream(proc.getOutputStream());
    if (debug >= 2 ) {
        log("runCGI stdin=[" + stdin + "], qs="
            + env.get("QUERY_STRING"));
    }
    if ("POST".equals(env.get("REQUEST_METHOD"))) {
        if (debug >= 2) {
            log("runCGI: writing ---------------\n");
            log(postIn);
            log("runCGI: new content_length=" + contentLength
                + "---------------\n");
        }
        commandsStdIn.write(postIn.getBytes());
    }
    if (stdin != null) {
        //REMIND: document this
        /* assume if nothing is available after a time, that nothing is
         * coming...
         */
        if (stdin.available() <= 0) {
            if (debug >= 2 ) {
                log("runCGI stdin is NOT available ["
                    + stdin.available() + "]");
            }
            try {
                Thread.currentThread().sleep(iClientInputTimeout);
            } catch (InterruptedException ignored) {
            }
        }
        if (stdin.available() > 0) {
            if (debug >= 2 ) {
                log("runCGI stdin IS available ["
                    + stdin.available() + "]");
            }
            bBuf = new byte[1024];
            bufRead = -1;
            try {
                while ((bufRead = stdin.read(bBuf)) != -1) {
                    if (debug >= 2 ) {
                        log("runCGI: read [" + bufRead
                            + "] bytes from stdin");
                    }
                    commandsStdIn.write(bBuf, 0, bufRead);
                }
                if (debug >= 2 ) {
                    log("runCGI: DONE READING from stdin");
                }
            } catch (IOException ioe) {
                //REMIND: replace with logging
                //REMIND: should I throw this exception?
                log("runCGI: couldn't write all bytes.");
                ioe.printStackTrace();
            }
        }
    }
    commandsStdIn.flush();
    commandsStdIn.close();


    /* we want to wait for the process to exit,  Process.waitFor()
     * is useless in our situation; see
     * http://developer.java.sun.com/developer/
     *                               bugParade/bugs/4223650.html
     */


    boolean isRunning = true;
    commandsStdOut = new BufferedReader
        (new InputStreamReader(proc.getInputStream()));
    commandsStdErr = new BufferedReader
        (new InputStreamReader(proc.getErrorStream()));
    BufferedWriter servletContainerStdout = null;


    try {
        if (response.getOutputStream() != null) {
            servletContainerStdout =
                new BufferedWriter(new OutputStreamWriter
                    (response.getOutputStream()));
        }
    } catch (IOException ignored) {
        //NOOP: no output will be written
    }


    while (isRunning) {


        try {
            //read stderr first
            cBuf = new char[1024];
            while ((bufRead = commandsStdErr.read(cBuf)) != -1) {
                if (servletContainerStdout != null) {
                    servletContainerStdout.write(cBuf, 0, bufRead);
                }
            }


            //set headers
            String line = null;
            while (((line = commandsStdOut.readLine()) != null)
                   && !("".equals(line))) {
                if (debug >= 2) {
                    log("runCGI: addHeader(\"" + line + "\")");
                }
                if (line.startsWith("HTTP")) {
                    //TODO: should set status codes (NPH support)
                    /*
                     * response.setStatus(getStatusCode(line));
                     */
                } else {
                    response.addHeader
                        (line.substring(0, line.indexOf(":")).trim(),
                         line.substring(line.indexOf(":") + 1).trim());
                }
            }


            //write output
            cBuf = new char[1024];
            while ((bufRead = commandsStdOut.read(cBuf)) != -1) {
                if (servletContainerStdout != null) {
                    if (debug >= 4) {
                        log("runCGI: write(\"" + cBuf + "\")");
                    }
                    servletContainerStdout.write(cBuf, 0, bufRead);
                }
            }


            if (servletContainerStdout != null) {
                servletContainerStdout.flush();
            }


            proc.exitValue(); // Throws exception if alive


            isRunning = false;


        } catch (IllegalThreadStateException e) {
            try {

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   *
   * @throws IOException            if any.
   * @throws InterruptedException if any.
   */
  public int execute() throws IOException, InterruptedException {
    Process process = processBuilder.start();
    redirectStreams( process );
    notifyExecutionStarted( process );


    int answer = process.waitFor();
    notifyExecutionFinished( answer );
    return answer;
  }

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    }


    private void readVersion() throws IOException {


      final int DELAY = 10 * 1000;
      Process process;


      // cmd
      String[] cmd = new String[2];
      cmd[0] = "bulk_extractor";
      cmd[1] = "-V";


      // envp
      String[] envp = new String[0];  // LD_LIBRARY_PATH
//      envp[0] = "LD_LIBRARY_PATH=/usr/local/lib";


      process = Runtime.getRuntime().exec(cmd, envp);
//      process = Runtime.getRuntime().exec(cmd);
      readFromProcess = new BufferedReader(new InputStreamReader(process.getInputStream()));
      BufferedReader errorFromProcess = new BufferedReader(new InputStreamReader(process.getErrorStream()));
      stderrThread = new ThreadReaderModel(errorFromProcess);
      stderrThread.addReaderModelChangedListener(new Observer() {
        public void update(Observable o, Object arg) {
          String line = (String)arg;
          WLog.log("BulkExtractorVersionReader stderr: '" + line + "'");
        }
      });


      // start aborter timer
      ThreadAborterTimer aborter = new ThreadAborterTimer(process, DELAY);


      // read version
      final String VERSION_PREFIX = "bulk_extractor ";
      String input = readFromProcess.readLine();
      if ((input == null) || !input.startsWith(VERSION_PREFIX)) {
        // invalid input in read
        WError.showErrorLater("Error in reading bulk_extractor version: '" + input + "'",
                         "bulk_extractor failure", null);
      } else {


        // isolate the bulk_extractor version
        String bulk_extractorVersion = input.substring(VERSION_PREFIX.length());
        bulk_extractorVersion = bulk_extractorVersion.trim(); // bulk_extractor appends an unnecessary space


        WLog.log("BulkExtractorVersionReader.readVersion: bulk_extractor version " + bulk_extractorVersion + ", Bulk Extractor Viewer version " + Config.VERSION);
        // show both versions
        WError.showMessageLater("Versions:\nBulk Extractor Viewer: " + Config.VERSION
                      + "\nbulk_extractor: " + bulk_extractorVersion,
                      "Version Information");
//        WError.showMessageLater("\u2022 Bulk Extractor Viewer Version " + Config.VERSION
//                      + "\n\u2022 bulk_extractor Version " + bulk_extractorVersion,
//                      "Version Information");
      }


      // wait for the bulk_extractor process to terminate
      try {
        process.waitFor();
      } catch (InterruptedException ie) {
        WLog.log("BulkExtractorVersionReader process interrupted");
      }


      // stream off any unexpected stdout

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    String[] envp = new String[0];  // LD_LIBRARY_PATH
//    envp[0] = "LD_LIBRARY_PATH=/usr/local/lib";


    // run exec
//    Process process = Runtime.getRuntime().exec(cmd, envp);
    Process process = Runtime.getRuntime().exec(cmd);
    BufferedReader readFromProcess = new BufferedReader(new InputStreamReader(process.getInputStream()));
    BufferedReader errorFromProcess = new BufferedReader(new InputStreamReader(process.getErrorStream()));
 
/* USE IN NEXT bulk_extractor
    // consume stderr using a separate Thread
    ThreadReaderModel stderrThread = new ThreadReaderModel(errorFromProcess);
    stderrThread.addReaderModelChangedListener(new Observer() {
      public void update(Observable o, Object arg) {
        String line = (String)arg;
        WLog.log("BulkExtractorScanListReader stderr: '" + line + "'");
      }
    });
*/


    // start the abort timer
    final int DELAY = 5000; // ms.  This should never happen, but if it does, it prevents a hang.
    ThreadAborterTimer aborter = new ThreadAborterTimer(process, DELAY);


    // read the scanners the old way from stderr
    ScanListReaderThread stderrThread = new ScanListReaderThread(errorFromProcess);
    stderrThread.start();


    // read the scanners the new way from stdout
    ScanListReaderThread stdoutThread = new ScanListReaderThread(readFromProcess);
    stdoutThread.start();


    // wait for the bulk_extractor process to terminate
    try {
      process.waitFor();
    } catch (InterruptedException ie1) {
      WLog.log("BulkExtractorVersionReader process interrupted");
    }


    // wait for stderr Thread to finish

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