[Fedora-packaging] Java packaging guidelines draft
Jesus M. Rodriguez
jmrodri at gmail.com
Thu Mar 27 21:22:25 UTC 2008
On Thu, Mar 27, 2008 at 11:59 AM, Nicolas Mailhot
<nicolas.mailhot at laposte.net> wrote:
> Le Jeu 27 mars 2008 15:57, Thomas Fitzsimmons a écrit :
> > Ville Skyttä wrote:
> > Yes, I've struggled to understand the same decision in the JDK
> > packages.
> > I wonder why the extra level of versioning is required:
> > $ ls -l /usr/lib/jvm/java-1.7.0-icedtea
> > lrwxrwxrwx 1 root root 26 2007-12-11 14:36
> > /usr/lib/jvm/java-1.7.0-icedtea -> java-1.7.0-icedtea-184.108.40.206
> > Nicolas, do you know the rationale? To enable parallel-installation
> > of multiple versions of the same JDK, perhaps?
> When you are in closed JVM hell you need to manage black-boxes and for
> this reason switching between different JVMs (or different builds of
> the same JVM) is very common (talking from an ISV perspective which
> was my job when I wrote the guidelines). You can't trust the vendor to
> fix its bugs timely. You can't trust it not to create regressions in a
> new build (that will take forever to ve fixed). All you can do it get
> a range of jvms and switch between them till you identify the most
> When openjdk gets solid enough people trust the OS jvm, and when java
> projects get the clue they need to work with any JVM not just the
> particular build they copied in their private build system, I expect
> those possibilities to gradually fall into disuse. But right now easy
> JVM switching is a must for users.
Another reason for parallel JVM installation is when you're working on
different releases of a product that requires different JVM levels.
I might have one that is certified to use 1.4.2 and another that requires 1.6.0.
I might be able to run my 1.4.2 under 1.6.0 but that's not always feasible.
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