Progressbar - how to load an undeterminated task in determinated way

i have an issue using a determinate progress bar to load an indeterminate task. I just can't figure it out . . how am i going to know how long will it takes. . ex: ( loader , GUI ) < my loader class will load my GUI class at the same time my loader class will put my progress bar in progress. this is needed to show my client that this application is still working ( it load some stuffs .. ) . lets just say that my progress bar's length is 10 , my task is five then .. when my task stop . it'll show 5 as a completed task. not 10 .. so can you help me guys ? i have used several methods but still. it's not working. .

Sorry, this is more a design critique than a solution... Why not just get rid of the progress bar, and replace it with a simple animation that does NOT attempt to inform the user how long the GUI is expected to take to load (which is irrelevant to a user who really has no option but to wait for it... assuming that we're not talking minutes in which case a progress % and ETA allows the user to make the decision to go away and make a cup of coffee, instead of just sitting there fuming at the incompetence of those damn java monkeys... but I digress)... it just reassures them that the little man in the box is still doing his stuff.

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