check minimum needed JVM

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brian - 06 May 2004 20:50 GMT

Hi,

is there a tool to check specified sourcecode for the JVM it need at
minimum to run properly?

any hints are highly welcome

regards
brian

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Mohun Biswas - 06 May 2004 21:01 GMT

> Hi,
>
> is there a tool to check specified sourcecode for the JVM it need at
> minimum to run properly?
>
> any hints are highly welcome

javac?

Signature

Thanks,
M.Biswas

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Roedy Green - 06 May 2004 23:59 GMT

>is there a tool to check specified sourcecode for the JVM it need at
>minimum to run properly?

You can try compiling it on a variety of JVMS, or with a variety of
bootclass libraries and see what works and what does not.

Perhaps you could prepare a list of all the classes you use, and
extract the SINCE commands from the source or Javadoc. Fill in any
missing ones.

The tool could be very useful generally. However, even then you are
not safe, since some classes added methods, or deprecated methods.
you really need to do it on a method level.

You could exract the files from classes.zip/rt.jar for each old JVM,
and produce a list of class/method/signatures. Then extract the same
from your class files. See http://mindprod.com/jgloss/jasm.html
for how.

Sounds like time to write up yet another student project.

--
Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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brian - 07 May 2004 19:00 GMT

> >is there a tool to check specified sourcecode for the JVM it need at
> >minimum to run properly?
>
> You can try compiling it on a variety of JVMS, or with a variety of
> bootclass libraries and see what works and what does not.

mhh.. i was looking for something more automated ;) I think it would
be really useful. You might want to check for v1.2 compatability for
example, to know if the javacode will compile with gcj.

> Perhaps you could prepare a list of all the classes you use, and
> extract the SINCE commands from the source or Javadoc. Fill in any
> missing ones.
> The tool could be very useful generally. However, even then you are
> not safe, since some classes added methods, or deprecated methods.
> you really need to do it on a method level.

I thought of the SINCE tag.. but since methods are not tagged with it
it won't be worth anything.

> You could exract the files from classes.zip/rt.jar for each old JVM,
> and produce a list of class/method/signatures. Then extract the same
> from your class files. See http://mindprod.com/jgloss/jasm.html
> for how.

good idea.. if I had the time I'd do it but such a tool is not that
important
for me. I was just wondering whether something like that exists
already..

> Sounds like time to write up yet another student project.

yep.. I'll recommend that at my university at once!

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Roedy Green - 07 May 2004 20:48 GMT

>I thought of the SINCE tag.. but since methods are not tagged with it
>it won't be worth anything.

Can they be? I suppose you could infer the since tag from the since
on the class, or from something you provide manually from your own
knowledge.

--
Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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brian - 10 May 2004 15:57 GMT

> >I thought of the SINCE tag.. but since methods are not tagged with it
> >it won't be worth anything.
>
> Can they be? I suppose you could infer the since tag from the since
> on the class, or from something you provide manually from your own
> knowledge.

Unfortunately not. Classes in JDK 1.4.2 are tagged with 1.1 but offer
methods which weren't there in 1.1. I think the easiest thing to do
would be setting up a database (for quick search) with all classes and
method signatures and tag the signatures with the earliest version
where it was found.

It DOES sound like a good student project ;)

cheers
brian

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Roedy Green - 10 May 2004 23:11 GMT

On 10 May 2004 07:57:25 -0700, daxel3@gmx.net (brian) wrote or quoted

>It DOES sound like a good student project ;)

It has been for a long time, though the outline of how to implement is
brief.

http://mindprod.com/projjdkversion.html
--
Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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check minimum needed JVM

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