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Subject: Ada/JVM: cannot import abstract subprogram
From: Shark8 <onewingedshark@gmail.com>
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Date: 2013-03-22T12:56:32-07:00
List-Id: <comp.lang.ada>

A couple of years ago or so I got the three interesting GNAT compilers (Ada=
->native-windows, Ada->Dotnet-VM, and Ada->Java-VM) I remember getting some=
 simple things working on the JVM one, enough that I could output text to t=
he console via Java's println or Ada's Print_line as well as doing some min=
or applet manipulation (drawing shapes for a class).

Anyway, I was wondering about perhaps applying the idea over here ( http://=
ruby-in-browser.googlecode.com/svn/trunk/evalruby/index.html ), combining w=
/ OpenToken (which, IIUC, has an already-working out-of-the-box Ada tokeniz=
er) and seeing what all I could do towards getting a <Script language=3D"Ad=
a"> tag working. {Yes, I know I'd also need a DOM package... but XML/Ada sa=
ys it has one.}

So I went and grabbed the 2012 JVM-GNAT and tried the bind_jre program (aft=
er some failures w/ JVM2Ada) and found that it could not handle the new Jav=
a 7 (version 51 class-files, IIUC)... or the version 50 class files. So, I =
obtained Java 1.4 and installed that in an effort to get one that would bin=
d... I was half-way successful: it dumped out the million-and-a-half (actua=
lly 3622) ADS files.

But there's a problem: in many of the files there are subprograms marked ab=
stract and then pragmas for importation yielding the error of  "cannot impo=
rt abstract subprogram" -- this leads me to believe there is something wron=
g with the jvm2ada packaged w/ GNAT GPL 2012 {remember it didn't generate t=
hese errors a couple years ago}... is anyone else having similar troubles? =
(I remember it being fairly easy to get the JVM-GNAT to generate [and inter=
face w/] class-files, the rough spot being the Java-ideology of having all =
operations be on references and the Ada-ideology of operating on the types =
themselves.)

Also, it seems a bit odd that they [Adacore] didn't use the opportunity to =
show off the interfacing Aspects of Ada 2012 in this version of jvm2ada.