Re: [gentoo-java] Question about Sun-Jdk 1.4.2.10

[Antony Riley <cyberiantiger@gmail.com>]

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There's a whole bunch of subtleties.

Just unmerge all your java packages, and try to re-emerge them with a
1.5system JVM.

New keywords.
Some packages build scripts use -source 1.1 -source 1.1 which the 1.5 javac
doesn't seem to support anymore. [goes as low as 1.2 now]

I'm sure there's more.

The "not backwards compatable to 1.5" is a bit of an error as many packages
seem to specify -source and -target in their build scripts.

I couldn't even get ant to build, which is fairly important for most java
packages.

I was thinking if you just patched ant to default the <javac> task to
-source 1.4 -target 1.5, you could probably get a mostly working system, but
the packages which set these explicitely would still be a problem, also it
may be a problem with 1.5 only packages that don't specify these [unless you
want to go around patching lots of build scripts]

I haven't looked at the experiement java stuff yet, might take a gander
sometime, so appologies if I'm saying stuff that's already been said.

On 11/29/05, Peter B. West <lists@pbw.id.au> wrote:
>
> Greg Tassone wrote:
> > On Tue, 2005-11-29 at 13:50 +0200, Petteri Räty wrote:
> >
> >>Greg Tassone wrote:
> >>
> >>>FYI:  There is nothing "unstable" about JDK 1.5 (or Java 5).
> >
> > ...
> >
> >> It has simply
> >>
> >>>been package-masked here at Gentoo because there have been some
> >>>lingering ebuilds that didn't compile cleanly with it.  Hopefully it is
> >>>going to be unmasked VERY soon.
> >>>
> >>
> >>It also by default produces class files that are not compatible with
> >>earlier versions etc.
> >
> > ...
> >
> >>You can safely make 1.5 the user vm using java-config -s. But just be
> >>sure you don't ever set it as the system vm.
> >
> >
> > Very true.  Just to clear up any confusion for others on the list, this
> > means that if you are trying to run a 1.5 JDK as the primary on your
> > system at the same time you have a 1.4 JDK running, the 1.4 JDK will be
> > unable to use most of the code compiled from the 1.5 JDK (by default).
> >
> > Since most packages on the Gentoo distro compile themselves from source
> > (Java included), having a 1.5 JDK as your *system VM* means that your
> > Java applications would be compiled so that ONLY Java 5 (and higher)
> > runtimes could use the applications.  This is a show-stopper for those
> > still running a 1.4 JDK (at least for non-developers, who should know
> > how to deal with this stuff anyway):
> >
> > Choices:
> >
> >       * Run only 1.5 or higher on your system (with no intention of ever
> >         going back down).  Note that as of a while ago certain packages
> >         in the Portage tree still required 1.4, so this approach may
> >         preclude installing those packages from Portage.
> >  --OR--
> >       * Take Petteri's advice and leave 1.4 as the system VM, and set
> >         your "user" VM to 1.5 (or higher) if desired.
> >
> > HTH to clarify...
> >
> > Greg
>
> So who wants to run a 1.4 JDK?  And what, exactly, prevents anything
> from being compiled under 1.5?  The only thing I can think of is the
> user of the newly reserved word 'enum'.  Big deal.  How long has 1.5
> been around now?
>
> My perception is that there is only an ideological impediment to going
> with 1.5.  That is that it will be a long time before the
> Stallman-approved JVMs support 1.5.  So, the Java herd on Gentoo Stalls
> the adoption of 1.5, just to "prove" that 1) you don't need it, and 2)
> it's a very bad thing.  Or at least it will be until the "free as in
> slaves to ideology" crowd get their act together.  Thanks for nothing.
>
> Peter
> --
> Peter B. West <http://cv.pbw.id.au/>
> Folio <http://defoe.sourceforge.net/folio/>
>
>
>

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