Program: 89739
Project: 89739
Buggy source:
/** 
 * Calls the Unix sort command with the options <code>$filesNames -o $outputfile -T WaybackSettings#WAYBACK_AGGREGATOR_TEMP_DIR. Sets the LC_ALL environment variable before making the call.
 * @param files The files to merge and sort
 * @param outputFile The resulting sorted file
 * @param additionalArgs A list af extra arguments, which (if different fromnull) are added to the sort call.<p> Note: If any of the args contain a whitespace the call will fail.
 */
private void processFiles(File[] files,File outputFile,List<String> additionalArgs){
  if (files.length == 0) {
    return;
  }
  Process p=null;
  try {
    List<String> inputFileList=new LinkedList<String>();
    for (int i=0; i < files.length; i++) {
      if (files[i].exists() && files[i].isFile()) {
        inputFileList.add(files[i].getCanonicalPath());
      }
 else {
        log.warn("String_Node_Str" + files[i] + "String_Node_Str"+ "String_Node_Str");
      }
    }
    List<String> cmd=new LinkedList<String>();
    cmd.add("String_Node_Str");
    cmd.addAll(inputFileList);
    cmd.add("String_Node_Str");
    cmd.add(outputFile.getCanonicalPath());
    cmd.add("String_Node_Str");
    cmd.add(Settings.get(WaybackSettings.WAYBACK_AGGREGATOR_TEMP_DIR));
    if (additionalArgs != null || additionalArgs.isEmpty()) {
      for (      String argument : additionalArgs) {
        ArgumentNotValid.checkTrue(argument.indexOf(' ') == -1,"String_Node_Str" + argument + "String_Node_Str");
      }
      cmd.addAll(additionalArgs);
    }
    ProcessBuilder pb=new ProcessBuilder(cmd);
    pb.environment().put("String_Node_Str","String_Node_Str");
    pb.directory(new File(System.getProperty("String_Node_Str")));
    p=pb.start();
    p.waitFor();
    if (p.exitValue() != 0) {
      log.error("String_Node_Str" + p.exitValue());
    }
  }
 catch (  Exception e) {
    log.error("String_Node_Str",e);
  }
}

Fixed version (ground truth):
/** 
 * Calls the Unix sort command with the options <code>$filesNames -o $outputfile -T WaybackSettings#WAYBACK_AGGREGATOR_TEMP_DIR. Sets the LC_ALL environment variable before making the call.
 * @param files The files to merge and sort
 * @param outputFile The resulting sorted file
 * @param additionalArgs A list af extra arguments, which (if different fromnull) are added to the sort call.<p> Note: If any of the args contain a whitespace the call will fail.
 */
private void processFiles(File[] files,File outputFile,List<String> additionalArgs){
  if (files.length == 0) {
    return;
  }
  Process p=null;
  try {
    List<String> inputFileList=new LinkedList<String>();
    for (int i=0; i < files.length; i++) {
      if (files[i].exists() && files[i].isFile()) {
        inputFileList.add(files[i].getCanonicalPath());
      }
 else {
        log.warn("String_Node_Str" + files[i] + "String_Node_Str"+ "String_Node_Str");
      }
    }
    List<String> cmd=new LinkedList<String>();
    cmd.add("String_Node_Str");
    cmd.addAll(inputFileList);
    cmd.add("String_Node_Str");
    cmd.add(outputFile.getCanonicalPath());
    cmd.add("String_Node_Str");
    cmd.add(Settings.get(WaybackSettings.WAYBACK_AGGREGATOR_TEMP_DIR));
    if (additionalArgs != null && !additionalArgs.isEmpty()) {
      for (      String argument : additionalArgs) {
        ArgumentNotValid.checkTrue(argument.indexOf(' ') == -1,"String_Node_Str" + argument + "String_Node_Str");
      }
      cmd.addAll(additionalArgs);
    }
    ProcessBuilder pb=new ProcessBuilder(cmd);
    pb.environment().put("String_Node_Str","String_Node_Str");
    pb.directory(new File(System.getProperty("String_Node_Str")));
    p=pb.start();
    p.waitFor();
    if (p.exitValue() != 0) {
      log.error("String_Node_Str" + p.exitValue());
    }
  }
 catch (  Exception e) {
    log.error("String_Node_Str",e);
  }
}