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From "Alexey Varlamov" <alexey.v.varla...@gmail.com>
Subject Re: [j9] Doesn't deal with -showversion
Date Thu, 14 Sep 2006 15:32:47 GMT
2006/9/14, Geir Magnusson Jr. <geir@pobox.com>:
>
>
> Oliver Deakin wrote:
> > Tim Ellison wrote:
> >> Geir Magnusson Jr. wrote:
> >>
> >>> Oliver and Co :
> >>>
> >>> I don't know if you caught this in another thread, but I recently
> >>> changed the launcher to pass the "-showversion" cmd line param through
> >>> to the VM after the launcher prints out its version, so that we can also
> >>> know the version of the VM.
> >>>
> >>> The problem with this brilliant strategy is that J9 doesn't actually
> >>> deal with -showversion.
> >>>
> >>> Can you add that to the list of things to tweak?  Either silently
> >>> swallow it, or print something useful would be my suggestion...
> >>>
> >>> geir
> >>>
> >>
> >> Hmm, I'm not convinced that you can expect each VM to respond to
> >> -showversion, we may have to continue to handle that in the launcher.
> >>
> >> Certainly another VM in popular usage (Sun 5.0) doesn't recognise it
> >> based on my test code below.
> >>
> >> We hacked the harmony launcher code to do the brain-dead thing of
> >> printing out the launcher version, but I agree that it should print more
> >> useful info like the VM + classlib versions.
> >>
> >> A reasonable way to get the VM version info would be to create the VM
> >> then print the 'java.vm.version' property value.
> >>
> >
> > Agreed, this sounds like a reasonable alternative to printing version
> > information
> > from the launcher, or expecting all Harmony compatable VMs to accept
> > -showversion/-version.
>
> We expect so much out of Harmony compatible VMs, we're worried about one
> cmd line flag?
>
> >
> > Can I suggest a start sequence similar to the following:
> > 1) If no options or classes are specified, print help and exit
> > 2) If -version, create VM (without -version option) and print
> > java.vm.version property. Exit.
> > 3) If -showversion, create VM (without -showversion option) and print
> > java.vm.version. Go to 5.
> > 4) If neither -version nor -showversion are specified, create VM with
> > specified options. Go to 5.
> > 5) If VM creation returns successfully, check if a main class has been
> > specified. If not, print help
> > information, destroy the VM and exit (we currently do not print help at
> > this point).
> > 6) If a class has been specified, launch main().
> >
> > Does that sound right?
>
> That's fine, but I'm still wondering why we're so concerned about other
> VMs that wouldn't support anything else in harmony...
>

Good point.
I also wonder how our tools handle such option, can the launcher interfere?
--
Alexey

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