Problems with Adler32 class in JDK 1.5 (not tried 1.6)

Question

When I use the java.util.zip.Adler32-class for generating Adler32-checksums, I found a couple of strange problems. When the total filesize (generating checksums of several files with the same checksum-object, using reset() in between) is 31999 bytes or greater, it gives pseudorandom output for the first file that exceeds the 31999 bytes. By running the test-program several times in a row, it seems like the output changes every second, as if random data was generated with the second counter as a seed. All the other checksums seem correct, and they do not change. A workaround that works for a series of only small files is to create a new Adler32-object for every file that needs its checksum generated, but that proves itself insufficient when a single file exceeds 31998 bytes of size (31999 or above).
I've tried different inputstreams and various methods of using the update(xx)-functions of the Adler32, but I always get the same results. Is this a known bug (Note: JDK 1.5, not 1.6)? Or am I doing something obviously wrong? Example source code can be provided if necessary.

Answer 1

R,
I'm disappointed to see that you haven't received any replies to this. I am experiencing a very similar problem. What I have noticed is that the problem occurs when the combo-box is forced to be heavy-weight (meaning it has to draw itself outside the bounds of the window). In those cases, I can never pick a different value from the combo-box in the table. The exact same app run under 1.3.1 does not have any problems. Further, combo-boxes not in table views do not seem to have any problems even when they are heavy-weight.
Paul