The program suspend occasionally,until I press "enter"

Question

Please help! my program is simple, but it don't run stablely! :((
Occasionally,it suspend, and when I press "enter",it resume, but when run for
a few hours,it suspend again.
my program just like that:
=======================
try {
while (true) {
now = Calendar.getInstance();
year = now.get(Calendar.YEAR);
month = now.get(Calendar.MONTH) + 1;
date = now.get(Calendar.DATE);
hour = now.get(Calendar.HOUR_OF_DAY);
minute = now.get(Calendar.MINUTE);
second = now.get(Calendar.SECOND);
//run on the fifth minute every hour
if (lastHour != hour && minute == 5) {
System.out.println("Running...");
System.out.println("date time:" + year + "-" + month + "-" +
date + " " +
hour + ":" + minute + ":" + second);
/* do the routine job start */
// must ftp a file, and do something else
System.out.println("successfully!");
catch (Exception ex) {
System.out.println(ex.getMessage());
/* do the routine job end */
lastHour = hour;
// sleep for 30 seconds
try {
Thread.sleep(30000);
catch (InterruptedException ex1) {
System.out.println(ex1.getMessage());
catch (Exception ex2) {
ex2.printStackTrace();
=======================
the ouput of the program is just like that:
Running
date time:2003-10-17 16:5:12
Finish ftp. File size: 729088 bytes.
successfully!
---- suspend here, when I found the File size din't change on 17:20:22,
---- I press "enter",and the following shows
Running
date time:2003-10-17 17:5:18
Finish ftp. File size: 671744 bytes.
successfully!
==========================================
I can figure out what happened to my program , the Thread.sleep interrupted ? the ftp interrupted ?
please give me some advices,I greatly appreciate your help!!!

Answer 1

the program suspend occasionally,until I press my keyboard,
Please help! It have tortured me for a long time.
my program is simple, but it don't run stablely! :((
Occasionally, it suspend, and when I press my keyboard, it resume, but when run for a day,it suspend again.
my program just like that:
===============================================
// a rountine job, run every hour
// timer = new Timer();
// timer.scheduleAtFixedRate(new RemindTask(), time, 60 * 60* 1000); // 1 hour
System.out.println("Start to run,save log, date time:" + year + "-" + month + "-" + date + " " +
hour + ":" + minute + ":" + second + " Current=" + System.currentTimeMillis());
logSaver2.saveLog("date time:" + year + "-" + month + "-" + date + " " + hour + ":" + minute + ":" + second);
System.out.println("end log, start ftp, Current=" + System.currentTimeMillis());
// must ftp a file, and to dump the file into database
System.out.println("finish!");
==================================================
logSaver2.saveLog just do this:
RandomAccessFile myRAFile;
myRAFile.seek(myRAFile.length()); //move to the end of the file
myRAFile.writeBytes(s); //Start appending!
====================================================
the ouput of the program is just like that:
Start to run,save log, date time:2003-12-11 08:10:00 Current=1071101400854
end log, start ftp, Current=1071101400856
finish!
------------- it suspend,I checked the log file, it have recorded "date time:2003-12-11 09:10:10",
--------------and when I press keyboard on 09:38:40, the following shows, and it runs normally
Start to run,save log, date time:2003-12-11 09:10:10 Current=1071105200898
end log, start ftp, Current=1071107280241
finish!
======================================================
notice that when it suspend, the difference of the two "Current" values will be large,
and when it run on time, the difference of the two "Current" values will be small,
but I just do "savelog" at that time span!
and some experience:
I once used the windows ftp client to do the ftp, and the program suspend frequently(once a few hour),
and I used the enterpriseftp-1.2.3 now, the program suspend occasionally(maybe twice a day)
I cann't figure out what happened to my program.
please give me some advices,I greatly appreciate your help!!!