Program: 29193
Project: 29193
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(){
synchronized (thisInstance.rotationRequested) {
        if (thisInstance.meter != null && thisInstance.meter.written <= 0) {
          return null;
        }
        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();
          }
          FileOutputStream oldFileFO=new FileOutputStream(oldFile);
          oldFileFO.close();
          openFile(getLogFileName());
          absoluteFile=getLogFileName();
          if (dayBasedFileRotation) {
            LogRotationTimer.getInstance().restartTimerForDayBasedRotation();
          }
 else {
            LogRotationTimer.getInstance().restartTimer();
          }
          cleanUpHistoryLogFiles();
        }
 catch (        IOException ix) {
          new ErrorManager().error("String_Node_Str",ix,ErrorManager.GENERIC_FAILURE);
        }
        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(){
synchronized (thisInstance.rotationLock) {
        if (thisInstance.meter != null && thisInstance.meter.written <= 0) {
          return null;
        }
        thisInstance.flush();
        thisInstance.close();
        try {
          if (!absoluteFile.exists()) {
            File creatingDeletedLogFile=new File(absoluteFile.getAbsolutePath());
            if (creatingDeletedLogFile.createNewFile()) {
              absoluteFile=creatingDeletedLogFile;
            }
          }
 else {
            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();
            }
            FileOutputStream oldFileFO=new FileOutputStream(oldFile);
            oldFileFO.close();
            openFile(getLogFileName());
            absoluteFile=getLogFileName();
            if (dayBasedFileRotation) {
              LogRotationTimer.getInstance().restartTimerForDayBasedRotation();
            }
 else {
              LogRotationTimer.getInstance().restartTimer();
            }
            cleanUpHistoryLogFiles();
          }
        }
 catch (        IOException ix) {
          new ErrorManager().error("String_Node_Str",ix,ErrorManager.GENERIC_FAILURE);
        }
        return null;
      }
    }
  }
);
}