Java Progress Bar Not Showing Progress

systemErr · 06-22-2009, 01:59 AM

I'm writing a java program that uses a JProgressBar. My program performs inserts on a database and the progress bar keeps track of this by showing a percentage of the task being completed. My problem is that when I run "long" tasks, say a couple minutes, the progress-bar doesn't show any progress. The inserts are performed on the database, but no indication of progress is made via the progress-bar. However, for shorter tasks, the progress-bar shows progress just fine.

Any ideas what causes this?

ShosMeister · 06-23-2009, 08:03 AM

Some sample code of how you are implementing the progress bar would be helpful. My guess is that it's not getting time to update unless it's run in a separate thread.

v1_0 · 07-14-2009, 08:54 AM

One thing to think about: if your database transactions take a different amount of time each, then your progress is just 'number of transactions' as opposed to 'time'.

Is it possible that your first transaction is taking a very long time (perhaps things are getting cached, or you are doing a select), and all your other transactions are very quick? In that case, your status bar will sit for a while (as no transactions are completed) then 'jump' to done as your 2-n transactions get done quickly.

06-22-2009, 01:59 AM	#1 (permalink)
systemErr Registered User Join Date: Apr 2008 Posts: 104 OS: Win XP Home SP2	Java Progress Bar Not Showing Progress I'm writing a java program that uses a JProgressBar. My program performs inserts on a database and the progress bar keeps track of this by showing a percentage of the task being completed. My problem is that when I run "long" tasks, say a couple minutes, the progress-bar doesn't show any progress. The inserts are performed on the database, but no indication of progress is made via the progress-bar. However, for shorter tasks, the progress-bar shows progress just fine. Any ideas what causes this?

06-23-2009, 08:03 AM	#2 (permalink)
ShosMeister Registered User Join Date: Jan 2008 Location: Harpers Ferry, WV Posts: 400 OS: OS X 10.4.x	Re: Java Progress Bar Not Showing Progress Some sample code of how you are implementing the progress bar would be helpful. My guess is that it's not getting time to update unless it's run in a separate thread.

07-14-2009, 08:54 AM	#3 (permalink)
v1_0 Registered User Join Date: Dec 2008 Posts: 5 OS: XP	Re: Java Progress Bar Not Showing Progress One thing to think about: if your database transactions take a different amount of time each, then your progress is just 'number of transactions' as opposed to 'time'. Is it possible that your first transaction is taking a very long time (perhaps things are getting cached, or you are doing a select), and all your other transactions are very quick? In that case, your status bar will sit for a while (as no transactions are completed) then 'jump' to done as your 2-n transactions get done quickly.