I've now tried to reproduce this using RHEL 6.3 with the following Java versions (both with and without NSS configured):

java version "1.6.0_45"
Java(TM) SE Runtime Environment (build 1.6.0_45-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed mod)

java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.1) (rhel-1.45.1.11.1.e16-x86_64)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

I've still not been able to reproduce the issue reported.

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