[trill]

Hi, My problem here is after I ran my code, I cant delete the origin file that I have ftp it. For example, I ftp C:\a\a.txt to /home/trill/upload/a.txt. After doing this, I need to delete C:\a\a.txt but I got this message "Cannot delete a.txt:It is being used by another person or program".
Anyone knows what wrong with my code here?

Code:

BufferedReader reader = null;
Ftp ftp = null;
String tmp = null;
InetAddress Inet = null;
try{
String lStrUploadFileLog = "C:/FTPLog/FTPLog_05122003.log";
String lStrUploadFilePath = "/home/trill/upload/";
String lStrFTP_USER = "trill";
String lStrFTP_PWD = "password";
String lStrFTP_IP = "192.168.1.100";
String lStrLogFileDate = "LOG_FILE_DATE";

reader = new BufferedReader(new FileReader(new File(lStrUploadFileLog)));
Inet = InetAddress.getByName(lStrFTP_IP);
tmp = reader.readLine();
ftp = new Ftp(Inet,lStrFTP_USER,lStrFTP_PWD);
ftp.setType(ftp.BINARY);

if(tmp != null){
System.out.println("lStrUploadFileLog = "+lStrUploadFileLog);
System.out.println("lStrUploadFilePath+lStrLogFileDate = "+(lStrUploadFilePath+lStrLogFileDate));
ftp.startPut(lStrUploadFileLog,lStrUploadFilePath+lStrLogFileDate);
System.out.println("tmp = "+tmp);
StringTokenizer strtmp = new StringTokenizer(tmp,",");
int size_strtmp = strtmp.countTokens();

while (size_strtmp>0){
String lStrUploadFile = strtmp.nextToken();
size_strtmp--;
StringTokenizer strlStrUploadFile = new StringTokenizer(lStrUploadFile,"\\");
int size_strlStrUploadFile = strlStrUploadFile.countTokens();
String substr = lStrUploadFile.substring(lStrUploadFile.lastIndexOf("\\")+1,lStrUploadFile.length());

ftp.startPut(lStrUploadFile,lStrUploadFilePath+substr);
ftp.waitUntilTransferComplete();

System.out.println("File(s) download completed!");
}
try {
File ff = new File(lStrUploadFileLog);
System.out.println(ff.getAbsolutePath());
boolean state = ff.delete();
System.out.println(state);
} catch ( SecurityException se ) {
System.out.println("Error SecurityException: "+se );
se.printStackTrace();
}
catch(Exception e){
System.out.println("Error Exception1: "+e );
e.printStackTrace();
}
}
System.out.println("Upload to server completed!!!");
}catch(Exception e){

System.out.println("Error Exception: "+e);
}
finally{
if(reader != null)
reader.close();
if(ftp != null)
ftp.close();
reader = null;
ftp = null;
tmp = null;
Inet = null;
}

Thanks.