Program: 75177
Project: 75177
Buggy source:
private void _exec() throws IllegalActionException {
  try {
    _stopFireRequested=false;
    if (_process != null) {
      _terminateProcess();
    }
    Runtime runtime=Runtime.getRuntime();
    command.update();
    String[] commandArray=StringUtilities.tokenizeForExec(((StringToken)command.getToken()).stringValue());
    File directoryAsFile=directory.asFile();
    if (_debugging) {
      _debug("String_Node_Str" + ((StringToken)command.getToken()).stringValue() + "String_Node_Str"+ "String_Node_Str"+ directoryAsFile+ "String_Node_Str");
    }
    ArrayToken environmentTokens=(ArrayToken)environment.getToken();
    if (_debugging) {
      _debug("String_Node_Str" + environmentTokens);
    }
    String[] environmentArray=null;
    if (environmentTokens.length() >= 1) {
      environmentArray=new String[environmentTokens.length()];
      for (int i=0; i < environmentTokens.length(); i++) {
        StringToken nameToken=(StringToken)(((RecordToken)environmentTokens.getElement(i)).get("String_Node_Str"));
        StringToken valueToken=(StringToken)(((RecordToken)environmentTokens.getElement(i)).get("String_Node_Str"));
        environmentArray[i]=nameToken.stringValue() + "String_Node_Str" + valueToken.stringValue();
        if (_debugging) {
          _debug("String_Node_Str" + i + "String_Node_Str"+ environmentArray[i]+ "String_Node_Str");
        }
        if (i == 0 && environmentTokens.length() == 1 && environmentArray[0].equals("String_Node_Str")) {
          if (_debugging) {
            _debug("String_Node_Str" + "String_Node_Str" + "String_Node_Str"+ "String_Node_Str"+ "String_Node_Str");
          }
          environmentArray=null;
        }
      }
    }
    _process=runtime.exec(commandArray,environmentArray,directoryAsFile);
    _outputGobbler=new _StreamReaderThread(_process.getInputStream(),"String_Node_Str" + _streamReaderThreadCount++,this);
    _errorGobbler=new _StreamReaderThread(_process.getErrorStream(),"String_Node_Str" + _streamReaderThreadCount++,this);
    _errorGobbler.start();
    _outputGobbler.start();
    if (_streamReaderThreadCount > 1000) {
      _streamReaderThreadCount=0;
    }
    OutputStreamWriter inputStreamWriter=new OutputStreamWriter(_process.getOutputStream());
    _inputBufferedWriter=new BufferedWriter(inputStreamWriter);
  }
 catch (  IOException ex) {
    throw new IllegalActionException(this,ex,"String_Node_Str" + command + "String_Node_Str");
  }
}

Fixed version (ground truth):
private void _exec() throws IllegalActionException {
  try {
    _stopFireRequested=false;
    if (_process != null) {
      _terminateProcess();
    }
    Runtime runtime=Runtime.getRuntime();
    command.update();
    String[] commandArray=StringUtilities.tokenizeForExec(((StringToken)command.getToken()).stringValue());
    File directoryAsFile=directory.asFile();
    if (_debugging) {
      _debug("String_Node_Str" + ((StringToken)command.getToken()).stringValue() + "String_Node_Str"+ "String_Node_Str"+ directoryAsFile+ "String_Node_Str");
    }
    ArrayToken environmentTokens=(ArrayToken)environment.getToken();
    if (_debugging) {
      _debug("String_Node_Str" + environmentTokens);
    }
    String[] environmentArray=null;
    if (environmentTokens.length() >= 1) {
      environmentArray=new String[environmentTokens.length()];
      for (int i=0; i < environmentTokens.length(); i++) {
        StringToken nameToken=(StringToken)(((RecordToken)environmentTokens.getElement(i)).get("String_Node_Str"));
        StringToken valueToken=(StringToken)(((RecordToken)environmentTokens.getElement(i)).get("String_Node_Str"));
        environmentArray[i]=nameToken.stringValue() + "String_Node_Str" + valueToken.stringValue();
        if (_debugging) {
          _debug("String_Node_Str" + i + "String_Node_Str"+ environmentArray[i]+ "String_Node_Str");
        }
        if (i == 0 && environmentTokens.length() == 1 && environmentArray[0].equals("String_Node_Str")) {
          if (_debugging) {
            _debug("String_Node_Str" + "String_Node_Str" + "String_Node_Str"+ "String_Node_Str"+ "String_Node_Str");
          }
          environmentArray=null;
        }
      }
    }
    _process=runtime.exec(commandArray,environmentArray,directoryAsFile);
    _outputGobbler=new _StreamReaderThread(_process.getInputStream(),"String_Node_Str" + _streamReaderThreadCount++,this);
    _errorGobbler=new _StreamReaderThread(_process.getErrorStream(),"String_Node_Str" + _streamReaderThreadCount++,this);
    _errorGobbler.start();
    _outputGobbler.start();
    if (_streamReaderThreadCount > 1000) {
      _streamReaderThreadCount=0;
    }
    OutputStreamWriter inputStreamWriter=new OutputStreamWriter(_process.getOutputStream());
    _inputBufferedWriter=new BufferedWriter(inputStreamWriter);
  }
 catch (  IOException ex) {
    throw new IllegalActionException(this,ex,"String_Node_Str" + command.getExpression() + "String_Node_Str");
  }
}