#vulnerable code 
                              public static int runCommand(final CCTask task, final File workingDir, final String[] cmdline,
      final boolean newEnvironment, final Environment env) throws BuildException {
    try {
      task.log(Commandline.toString(cmdline), task.getCommandLogLevel());
      final Execute exe = new Execute(new LogStreamHandler(task, Project.MSG_INFO, Project.MSG_ERR));
      if (System.getProperty("os.name").equals("OS/390")) {
        exe.setVMLauncher(false);
      }
      exe.setAntRun(task.getProject());
      exe.setCommandline(cmdline);
      exe.setWorkingDirectory(workingDir);
      if (env != null) {
        final String[] environment = env.getVariables();
        if (environment != null) {
          for (final String element : environment) {
            task.log("Setting environment variable: " + element, Project.MSG_VERBOSE);
          }
        }
        exe.setEnvironment(environment);
      }
      exe.setNewenvironment(newEnvironment);
      return exe.execute();
    } catch (final java.io.IOException exc) {
      throw new BuildException("Could not launch " + cmdline[0] + ": " + exc, task.getLocation());
    }
  } 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                              public static int runCommand(final CCTask task, final File workingDir, final String[] cmdline,
      final boolean newEnvironment, final Environment env) throws BuildException {
    try {
      task.log(Commandline.toString(cmdline), task.getCommandLogLevel());

     /* final Execute exe = new Execute(new LogStreamHandler(task, Project.MSG_INFO, Project.MSG_ERR));
      if (System.getProperty("os.name").equals("OS/390")) {
        exe.setVMLauncher(false);
      }
      exe.setAntRun(task.getProject());
      exe.setCommandline(cmdline);
      exe.setWorkingDirectory(workingDir);
      if (env != null) {
        final String[] environment = env.getVariables();
        if (environment != null) {
          for (final String element : environment) {
            task.log("Setting environment variable: " + element, Project.MSG_VERBOSE);
          }
        }
        exe.setEnvironment(environment);
      }
      exe.setNewenvironment(newEnvironment);
      return exe.execute();
            */
	  return CommandExecution.runCommand(cmdline,workingDir,task);
    } catch (final java.io.IOException exc) {
      throw new BuildException("Could not launch " + cmdline[0] + ": " + exc, task.getLocation());
    }
  }