JRE won't cache some jar files.

I have seen this behavior several times and cannot figure it out. For some reason, the JRE will not always cache jar files. I have tried to narrow down a pattern, but cannot. The closest pattern I can see is that on occasions when a jar is not cached, the file was not signed. I have not seen an instance when a signed jar would not cache. Having said that, occassionally, unsigned jars do appear to be cached.
This behavior has been seen with all versions from 1.4 - 1.6. In all cases, the max cache size is far great than would ever be needed and in most cases, jar cache is cleared prior to testing.
Any hints, or is this expected behavior? If expected, is it documented anywhere?

Hi Matthew,
I get the same error when using the Camino browser and StuffIt v9.0.1. So, I'd guess it's a problem with the file rather than anything on our machines.

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