@swpalmer:
This depends on what you're doing with it and of course which OS you use ....
- In Linux there is a nice bug that let it fail to load the native motif library (already known and fixed in beta2)
- In WinXP I had recently a wonderful NotYetImplementedException or such ... nice!

and yes i'm bug-reporting.
before going completely of topic something different: Doing a Java 1.4 compatible build is very difficult these times as soon you got used to generics and all that nice stuff (foreach, autoboxing). Ever tried to invoke the compiler with that: javac -source 1.5 -target 1.4

Btw I can't live without System.nanoTime()
