Re: [gentoo-java] Falling to the lowest jdk available

[Caster <cast3r@seznam.cz>]

Miroslav Šulc wrote:
> Hi,
> 
> I've faced a problem with migrated packages on my laptop. If I remember
> well, I've read somewhere that the new Java system will always try to
> build packages with the lower JDK possible. At least on my laptop (it's
> a fresh install of Gentoo - I've installed it about two weeks ago)
> packages are not built with the lowest JDK possible which results in
> these bugs when compiling packages dependant on a badly built package:

It's like this:

DEPEND=">=virtual/jdk-1.4" will make it use 1.4 or higher JDK (it
prefers the higher, you can tune that in
/etc/java-config-2/build/jdk.conf) but it will rewrite the build.xml
file(s) to -source 1.4 -target 1.4 so even with 1.5 JDK it should
produce 1.4 compatible class files.

DEPEND="=virtual/jdk-1.4" will use 1.4 JDK specifically, in case the
package needs not just 1.4 language compliance but e.g. also breaks on
1.4 -> 1.5 API changes or relies on something else that is specific only
to 1.4.

So seeing "Using: sun-jdk-1.5" is not a bug, note you also see the
"Rewriting ./build.xml" that ensures proper -source and -target
arguments. The problem could be if you have built something with 1.5
before the migration - run java-1.5-fixer to fix that. But it is also
possible that the build.xml file(s) weren't properly rewritten, some
were ommitted... and that would be a bug. You just need to find out
which package is causing that (probably some that will want to be
rebuilt with java-1.5-fixer over and over again).

Caster
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