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From "Geir Magnusson Jr." <g...@pobox.com>
Subject Re: [classlib][launcher]shall we handle the parameter -version and -showversion in launcher or vm?
Date Fri, 13 Oct 2006 00:47:36 GMT


Leo Li wrote:
> On 10/13/06, Geir Magnusson Jr. <geir@pobox.com> wrote:
>>
>>
>>
>> Tim Ellison wrote:
>> > Leo Li wrote:
>> >> Due to current VMI, we have to first create a java VM through
>> >> JNI_CreateJavaVM, then we can get property from functions defined by
>> >> VMI. It is possible not to change current vmi design and support java
>> >> -version, but
>> >> we have to create and then "kill" a new java vm. So I think it quite
>> >> wastes. I suggest the vmi.dll export another funciton to give out
>> >> some "static" property of the java vm implementation that is no
>> >> relevent to a live vm.
>> >
>> > What are you concerned about wasting?  It will take longer for sure, 
>> but
>> >  'java -version' doesn't need to be super fast (it prints to the 
>> console
>> > and quits).  In addition, we should consider gathering version
>> > information from the class library code too, i.e. to show each module
>> > version.  I don't think it warrants extending the VMI.
>>
>> Yes - as Tim noted, we probably don't care if typing "java -version" is
>> slow (unless some bonehead puts that into a SPEC benchmark...) because
>> the user isn't trying to accomplish anything useful.
> 
> 
> 
>   Ya, "java -version" need not be so fast. And the version really is
> related to classlib. I am to some degree too mad about performance:)
> 
>   If we have decided not to transfer version as an option into vm, we can
> make some change in launcher:
>   1.When create vm, "-version" is not included as part of vm argument, thus
> our vm will not report error.
>   2.When vm created, we uses a JNI call to 
> System.getProperty("java.version")
> or VMI funciton GetSystemProperty("java.version")to show it to user. I am
> not sure which way is better.
> 
>   Is the plan all right?

Yes, that was the plan :)

geir


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