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From: "Dave Adlam" <David.Adlam@AdlamSys.GlobalNet.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: Java portability (was: An Ada IDE and discussions)
Date: Mon, 30 Jul 2001 21:00:39 +0100
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Date: 2001-07-30T21:00:39+01:00
List-Id: <comp.lang.ada>

I seem to remember a post in the past (about the time JGNAT came out) from
Robert Dewar that suggested that the JGNAT Java Pragmas followed a draft AI.

This is a vague recollection so please let me apologise in advance if I got
that wrong (especially to Robert Dewar).

If you go to the jgnat_ug HTML file in the docs directory of your jGNAT
installation and follow the following series of links

What This Guide Contains ->Java-Specific Pragmas -> Handling Circularities
using With-Type Clauses -> A Word of Caution

you will find a statement on this issue.

Marc A. Criley wrote in message <3B5D5B79.F2DC527E@earthlink.net>...
>nicolas wrote:
>>
>> We never tried Ada for the JVM
>> Is there a standard specification when you want to access Java libraries,
or
>> is it specific for each vendor (Ada-Magic, JGNAT, others ?)
>> If we write Ada code for the JVM, will it be the same for all compiler
>> vendors which support it ?
>
>Since there's no officially recognized Java standard yet, there's no Ada
>standard specification for interfacing to it (as there is for C,
>Fortran, and COBOL, and just recently for C++), so vendors are free to
>forge their own specification.
>
>I'm nearly certain that each vendor has their own means of interfacing
>to the Java libraries.  I've not looked at the specifics of how AdaMagic
>does it, but I know that JGNAT added Java-specific pragmas to support
>interfacing.  In addition, the documentation describing how Java
>Interfaces are implemented (as discriminants) suggests some "magic"
>going on inside the compiler.
>
>It's not the _Ada_ code for a JVM that will differ between vendors, it's
>the interfacing to the class libraries.  I would expect vanilla Ada code
>to be quite portable, but the interfaces to Java classes will resemble
>one another, and differ in the details.
>
>Marc A. Criley