> Grabbing a JDK 5 today requires quite some extra jumps in the downloads,

very true, and it has become even harder since Oracle's purchase of Sun

> and we formally support building only against Java 5, by this
> meaning Java 6 builds might actually fail (sometime a unit test

I built GeoTools trunk recently (for the OSGi project we are trying to
set up with Jody) on a OpenJdk 6 b16 on CentOS 5.5 x86_64 and it went
very smoothly.

> is stupidly dependent on hash iteration order, though other times
> there are less obvious issues).

Yes, we had this as well and ended up hacking the unit tests to check
which version we are running. A bit ugly but I did not find any better
solution.

Another field with a lot of problems (as always since 1.4) is all the
XML / web services libraries included in the JRE. Behavior or included
libraries versions can significantly change between Java 5 and 6.

But all this is still what I would call "comfort" issues (not the same
as having generics or not when you from 1.4 to 1.5, if you see what I
mean).
I'm fully aware that it is easier for me to say so since I don't have
to maintain such a huge and complex codebase as GeoTools...

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