Reason why file can't be deleted?

When I want to delete a file via
file.delete()
the result is false. No IOException or other Exdeption just false. But what is the reason? When I try to delete the same file from another (simple test) application, i can delete the same file (result = true).
this happens for any new files in my directory. So, how can I find out the reason why the result is false and the file is not deleted?

yes, i'm pretty shure as i open the file to zip the
content to a new zip file, closing all the
input/output streams and then to a delete on the
original file. no exception, no error it just doesn't
get deleted and the return value is false. :-(
btw: the original file is not read only or something.
the files i want to zip are generated/copied on the
fly. and after processing, i want to zip them (which
works) and delete the original unzipped files (which
doesn't work).I know the feeling. But I'm pretty sure the file you want to delete isn't in the mood to getting deleted -:). Give it another try. Explicitly close is. Then delete it.

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df -h
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/dev/disk0s10 52162400 35274040 16888360 68% /Volumes/<name of other HD>
Then, enter this command, hit the return key, and peruse the output for the culprit(s) on that other drive:
lsof /dev/disk0s10
The only thing that should be listed is something like this, but that shouldn't prevent the disk from unmounting.
Finder 260 username 27r VDIR 14,20 68 425847 /Volumes/HD/.Trashes/501
If there are other processes and open files, you'll have to stop the processes. Launch Activity Monitor, check the process number that's running (in this example it's Finder w/process #260), select it, click on the Quit Process button, and click on the Quit button in the dialog box that pops up. Now, try deleting the folders.
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