2006/9/14, Geir Magnusson Jr. <[EMAIL PROTECTED]>:
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 --------------------------------------------------------------------- Terms of use : http://incubator.apache.org/harmony/mailing.html To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
