Program: 31161
Project: 31161
Buggy source:
public void start(){
  if (state != TclWrapperState.STOPPED)   return;
  tclContentFile=tclConsole.getState().getAttributeValue(TclComponentAttributes.CONTENT_FILE_ATTR);
  if (!tclContentFile.isFile())   return;
  state=TclWrapperState.STARTING;
  if (!fileExists) {
    new File(TCL_PATH).mkdirs();
    try {
      Files.copy(this.getClass().getResourceAsStream(TCL_RESOURCES_PATH + "String_Node_Str"),Paths.get(TCL_PATH + "String_Node_Str"),StandardCopyOption.REPLACE_EXISTING);
    }
 catch (    IOException e) {
      logger.error("String_Node_Str",e.getMessage());
      e.printStackTrace();
    }
    fileExists=true;
  }
  ProcessBuilder builder;
  List<String> command=new ArrayList<String>();
  command.add("String_Node_Str");
  command.add(TCL_PATH + "String_Node_Str");
  command.add("String_Node_Str" + tclConsole.getTclClient().getServerPort());
  command.add(tclContentFile.getAbsolutePath());
  builder=new ProcessBuilder(command);
  builder.directory(tclContentFile.getParentFile());
  builder.redirectErrorStream(true);
  try {
    process=builder.start();
  }
 catch (  IOException e) {
    e.printStackTrace();
    logger.error("String_Node_Str",e.getMessage());
    return;
  }
  new Thread(new Runnable(){
    @Override public void run(){
      BufferedReader reader=new BufferedReader(new InputStreamReader(process.getInputStream()));
      String line;
      try {
        String errorMessage="String_Node_Str";
        while ((line=reader.readLine()) != null) {
          errorMessage+="String_Node_Str" + line;
          if (line.contains("String_Node_Str")) {
            new Thread(new Runnable(){
              public void run(){
                Scanner sc=new Scanner(new InputStreamReader(process.getInputStream()));
                sc.close();
                stop();
              }
            }
).start();
            tclConsole.tclWrapperStartCallback();
            state=TclWrapperState.RUNNING;
            return;
          }
        }
        MessageBox userInfoBox=new MessageBox("String_Node_Str",errorMessage,JOptionPane.ERROR_MESSAGE);
        userInfoBox.show();
      }
 catch (      IOException e) {
        e.printStackTrace();
      }
    }
  }
).start();
}

Fixed version (ground truth):
public void start(){
  if (state != TclWrapperState.STOPPED)   return;
  tclContentFile=tclConsole.getState().getAttributeValue(TclComponentAttributes.CONTENT_FILE_ATTR);
  if (!tclContentFile.isFile())   return;
  state=TclWrapperState.STARTING;
  if (!fileExists) {
    new File(TCL_PATH).mkdirs();
    try {
      Files.copy(this.getClass().getResourceAsStream(TCL_RESOURCES_PATH + "String_Node_Str"),Paths.get(TCL_PATH + "String_Node_Str"),StandardCopyOption.REPLACE_EXISTING);
    }
 catch (    IOException e) {
      logger.error("String_Node_Str",e.getMessage());
      e.printStackTrace();
    }
    fileExists=true;
  }
  ProcessBuilder builder;
  List<String> command=new ArrayList<String>();
  command.add("String_Node_Str");
  command.add(TCL_PATH + "String_Node_Str");
  command.add("String_Node_Str" + tclConsole.getTclClient().getServerPort());
  command.add(tclContentFile.getAbsolutePath());
  builder=new ProcessBuilder(command);
  builder.directory(tclContentFile.getParentFile());
  builder.redirectErrorStream(true);
  try {
    process=builder.start();
  }
 catch (  IOException e) {
    e.printStackTrace();
    logger.error("String_Node_Str",e.getMessage());
    return;
  }
  new Thread(new Runnable(){
    @Override public void run(){
      BufferedReader reader=new BufferedReader(new InputStreamReader(process.getInputStream()));
      String line;
      try {
        String errorMessage="String_Node_Str";
        while ((line=reader.readLine()) != null) {
          errorMessage+="String_Node_Str" + line;
          if (line.contains("String_Node_Str")) {
            new Thread(new Runnable(){
              public void run(){
                Scanner sc=new Scanner(new InputStreamReader(process.getInputStream()));
                String nextLine;
                while (sc.hasNextLine()) {
                  nextLine=sc.nextLine();
                  if (nextLine.length() > 0)                   System.out.println(nextLine);
                }
                sc.close();
                stop();
              }
            }
).start();
            tclConsole.tclWrapperStartCallback();
            state=TclWrapperState.RUNNING;
            return;
          }
        }
        MessageBox userInfoBox=new MessageBox("String_Node_Str",errorMessage,JOptionPane.ERROR_MESSAGE);
        userInfoBox.show();
      }
 catch (      IOException e) {
        e.printStackTrace();
      }
    }
  }
).start();
}