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>> I'm running java-1.5 as a *generation 2* system vm without any
>> problems. The only problem is if you at one point where using 1.5 as
>> a *generation 1* system vm (e.g. before you started using the
>> migration overlay).
>> You can safely do "java-config-2 -S sun-jdk-1.5", as long as
>> "java-config-1 -f" doesn't list a 1.5 jdk and
>> /etc/java-config-2/build/jdk.conf doesn't list a 1.5 jdk for 1.4.
>> (e.g. doesn't give a version if you use the *=sun-jdk syntax)
> Then, the migration document should state how to set the generation-2
> system vm. It only tells about java-config-2 -s ...
Perhaps it should. On the other hand you don't have to, it will be set
automatically during the vm update process (which is described).
java-config-2 -s is only mentioned because it differers from the plain
portage case.

>> Anyway I have two problems right now:
>> 1. If I do java-config-2 -S sun-jdk-1.4, ant-core continues to build
>> with sun-java-1.5
Because system vm has nothing to do with emerge. For that you set the
build jdk. Note that system vm can be a jre or a jdk, while compilation
jdk has to be a jdk. This procedure differs from a plain portage
installation, and should perhaps be mentioned somewhere.

>> 2. Junit does not compile even having compiled ant-core with 1.4 vm
>> (I had to modify jdk.conf)
The the default jdk.conf will not make 1.4 sources build with a 1.5 jdk,
so you do not *have* to modify jdk.conf. However, you *must not* changee
jdk.conf to an invalid state, which is currently possible (and you must
have done). Perhaps there should be a warning in the sample file?
(something like "# Warning: Do NOT set a 1.5 jdk for use with anything
but 1.5 sources!")
If Junit doesn't compile after having (re-)emerged all java-packages
with a corrected jdk.conf, file a bugreport. To find all packages you
have to re-emerge use java-1.5-fixer from the list.
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