Program: 30134
Project: 30134
Buggy source:
/** 
 * A Simple rotate method to close the old file and start the new one when the limit is reached.
 */
public void rotate(){
  final GFFileHandler thisInstance=this;
  java.security.AccessController.doPrivileged(new java.security.PrivilegedAction(){
    public Object run(){
      thisInstance.flush();
      thisInstance.close();
      try {
        if (!absoluteFile.exists()) {
          File creatingDeletedLogFile=new File(absoluteFile.getAbsolutePath());
          creatingDeletedLogFile.createNewFile();
          absoluteFile=creatingDeletedLogFile;
        }
        File oldFile=absoluteFile;
        StringBuffer renamedFileName=new StringBuffer(absoluteFile + "String_Node_Str");
        logRotateDateFormatter.format(new Date(),renamedFileName,new FieldPosition(0));
        File rotatedFile=new File(renamedFileName.toString());
        boolean renameSuccess=oldFile.renameTo(rotatedFile);
        if (!renameSuccess) {
          FileUtils.copy(absoluteFile,rotatedFile);
          File freshServerLogFile=getLogFileName();
          FileOutputStream fo=new FileOutputStream(freshServerLogFile);
          fo.close();
        }
        openFile(getLogFileName());
        absoluteFile=getLogFileName();
        if (dayBasedFileRotation) {
          LogRotationTimer.getInstance().restartTimerForDayBasedRotation();
        }
 else {
          LogRotationTimer.getInstance().restartTimer();
        }
        cleanUpHistoryLogFiles();
      }
 catch (      IOException ix) {
        publish(new LogRecord(Level.SEVERE,"String_Node_Str" + ix.getMessage()));
      }
      return null;
    }
  }
);
}

Fixed version (ground truth):
/** 
 * A Simple rotate method to close the old file and start the new one when the limit is reached.
 */
public void rotate(){
  final GFFileHandler thisInstance=this;
  java.security.AccessController.doPrivileged(new java.security.PrivilegedAction(){
    public Object run(){
      thisInstance.flush();
      thisInstance.close();
      try {
        if (!absoluteFile.exists()) {
          File creatingDeletedLogFile=new File(absoluteFile.getAbsolutePath());
          creatingDeletedLogFile.createNewFile();
          absoluteFile=creatingDeletedLogFile;
        }
        File oldFile=absoluteFile;
        StringBuffer renamedFileName=new StringBuffer(absoluteFile + "String_Node_Str");
        logRotateDateFormatter.format(new Date(),renamedFileName,new FieldPosition(0));
        File rotatedFile=new File(renamedFileName.toString());
        boolean renameSuccess=oldFile.renameTo(rotatedFile);
        FileOutputStream oldFileFO=new FileOutputStream(oldFile);
        oldFileFO.close();
        if (!renameSuccess) {
          FileUtils.copy(absoluteFile,rotatedFile);
          File freshServerLogFile=getLogFileName();
          FileOutputStream fo=new FileOutputStream(freshServerLogFile);
          fo.close();
        }
        openFile(getLogFileName());
        absoluteFile=getLogFileName();
        if (dayBasedFileRotation) {
          LogRotationTimer.getInstance().restartTimerForDayBasedRotation();
        }
 else {
          LogRotationTimer.getInstance().restartTimer();
        }
        cleanUpHistoryLogFiles();
      }
 catch (      IOException ix) {
        publish(new LogRecord(Level.SEVERE,"String_Node_Str" + ix.getMessage()));
      }
      return null;
    }
  }
);
}