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The packager creates a jar file that does not match the jar file produced by the command line utility. The options in the observed situation were no compression with a "class only" filter and defaults on the manifest page. Opening the resulting file using winzip shows that the compression ratio is zero, but that the "packed" size for each file is three bytes longer than the actual file length. Using the command line utility, the packed size is exactly the same as the actual size. My database tool won't accept the jar file created by the packager.
*** Bug 7848 has been marked as a duplicate of this bug. ***
The "compressed" toggle has been removed, since, as you observe, the jar packager can't create uncompressed jars. 0 means "lowest level of compression", not uncompressed. If you leave the compression level at the default (6), the jar packager creates jar files eactly like the ones created by the jar utility.
Verified
Resolved for 3.4 or earlier, no new info since then -> closing.