Java.io.File.delete worked in 1.1, 1.2, 1.3 & 1.4, but not in 5.0

I have a logging utility I wrote originally in Java 1.0. A nightly housekeeping task runs which creates a ZIP file for the previous days log, then deletes the .log file. If I run this software with Java 5.0, the File.delete fails and the .LOG file remains on the disk. No exceptions are thrown. delete just returns false.
Any ideas?

to find a bug this basic! Each day I switch to a new log file, leaving the previous days file. I was never closing the old PrintStream... Jees... How embarrassing.

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<E-mail Edited by Host>

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