[fedora-java] Eclipse Luna on Fedora 21 and JDK 8 requirement
Deepak Bhole
dbhole at redhat.com
Fri Oct 31 15:45:50 UTC 2014
* Deepak Bhole <dbhole at redhat.com> [2014-10-31 11:44]:
> * Christopher <ctubbsii-fedora at apache.org> [2014-10-31 11:37]:
> > On Fri, Oct 31, 2014 at 5:35 AM, Mat Booth <fedora at matbooth.co.uk> wrote:
> >
> > On 31 October 2014 08:18, Max Rydahl Andersen <manderse at redhat.com> wrote:
> >
> >
> > Fedora 20 used to have 3 different Java versions (5, 7, 8).
> >
> >
> > ok, why no Java 6 ?
> >
> >
> > Besides many technical reason the biggest one is non-technical in
> > my eyes - no one volunteered to do it. You know it's always a
> > matter of "who will do the work?". I'm pretty sure that if someone
> > jumps in and say "Hey, I'll maintain Java 6, fix problems/adopt
> > Java 6 to changes in the OS if neeeded, help strengthen the
> > switching between JREs, go through the Java projects(shipped in
> > Fedora) and help them properly set their targets in build scripts
> > so builds properly work on Java 6 and etc" there will be no
> > objection to having Java 6. :)
> >
> >
> > Fair enough.
> >
> >
> > OpenJDK 7
> > was removed from F21 because its support will end before
> > F21 EOL and
> > we
> > don't want to ship software not supported by upstream.
> >
> >
> > So for users most stable thing is to use Oracle JDK builds
> > instead which
> > are and will stay available ?
> >
> >
> > Users can still try to use it but it's something that they have to
> > do on their own - download, extract, set PATH, etc. Just like on
> > every platform with Oracle JVM.
> >
> >
> > Yeah, this is similar experience for developers on all other platforms
> > so its expected/assumed.
> >
> >
> > No separate repo with "binaries that is currently supported but
> > will not
> > stay supported for all of fedora 21 lifetime" ?
> >
> >
> > 1. Fedora can not legally redistribute Oracle JDK.
> >
> >
> > I know - hence why I would think having a openjdk 7 build would make
> > sense.
> >
> >
> > 2. Fedora can not distribute something that Fedora developers can
> > not support if there is a problem in it (as it is with Oracle JDK).
> >
> >
> > so *any* package that is known to be marked as EOL sometime in the
> > future before the upcoming Fedora EOL's gets removed from that future
> > Fedora release ? Even that Java 7 is still the most used and targeted
> > Java version ?
> >
> >
> >
> > Maybe I misunderstand the use-case, but your projects can still target Java
> > 7 even if Eclipse is running on Java 8.
> >
> >
> >
> > That's not entirely true. This only works if a true JDK7 exists on the system.
> > While newer JDKs are able to target older runtimes, there are cases where one
> > can introduce source-incompatible changes that work in a newer JDK, but not in
> > an older JDK. This matters for collaborating on projects where some team
> > members are not using the newer JDK to target the older runtime. For instance,
> > this happened with JDK7/JDK6 on my team... JDK7 allows certain use of generics
> > syntax that properly compiles to JDK6 target, and validates in Eclipse as JDK6
> > source-compatible, but the actual JDK6 compiler treats as an error. I had to
> > abandon my use of Fedora 20 as a development environment for our project, and
> > revert to CentOS6 in order to guarantee I wasn't introducing source that was
> > incompatible with JDK6. Not making older JDKs (even stale ones) available is
> > likely to discourage Java developers from using Fedora as a development
> > platform.
> >
>
> This is a bug -- did you file it with us? If so, what was the
> conclusion? If -target 1.6 was specified, it should have been able to
> run it on 6 without issues and any problems encountered are certainly
> bugs.
>
Sorry, I forgot Eclipse uses ecj. I meant that if this happens with
javac that is a bug.
Deepak
> Deepak
>
> > Personally, unlike the original poster, I don't care which JVM Eclipse is
> > running on, itself (OpenJDK 8, or whatever is latest, works for me). But, I do
> > care about which JDKs are available on the system that Eclipse can launch to
> > build projects, because that affects whether I can use Fedora as my development
> > platform on team projects where some team members are using older JDKs (which
> > should be fine, until the project bumps its minimum JVM dependency).
> >
>
> > --
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>
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