aimmath-developers — Development related messages

Re: [Aimmath-developers] location for oreilly servlet classes

[Greg G. <gr...@ma...>]

On Sat, 23 Aug 2003, Gustav W Delius wrote:
> Currently the oreilly servlet classes are copied from the WEB-INF/cos
> directory to the WEB-INF/classes directory during installation. In the
> release I would like to put them into the WEB-INF/classes directory from the
> start so that no copying has to be done during installation. Are there any
> objections?

I think this is a good idea.

  Regards,
  Greg

Re: [Aimmath-developers] examples

[Greg G. <gr...@ma...>]

On Sat, 23 Aug 2003, Gustav W Delius wrote:
> CVS contains example questions using the trig package. Should these be
> included in the AiM 3.0 release? Or should they be an optional additional
> download?

zipped they amount to about 18k ... I think they should just be included.
What I'd like to see eventually is a whole suite of examples. Typical
quiz writers I imagine will like to have templates. Also, I didn't 
understand what Neil's Diff.mpl package was about, until I saw his 
examples. I regard examples as an important component of documentation.
They also provide a ready-made test suite for AIM.
 
> In either case, the examples for the diff, int and matrix packages should
> probably be treated in the same way. Neil, do you want to put them into CVS?

For the reasons given above, please do include them Neil. 

  Regards,
  Greg

[Aimmath-developers] pp> bug fixed

[Gustav W D. <gu...@ma...>]

I have committed a modified Compile.mpl which fixes the bug reported by
Gregg that the postprompt was not working.

Gustav

[Aimmath-developers] [ aimmath-Bugs-764611 ] Complex number I leads to compilation error

[SourceForge.net <no...@so...>]

Bugs item #764611, was opened at 2003-07-02 14:18
Message generated for change (Comment added) made by gustav_delius
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=439479&aid=764611&group_id=44411

Category: Marking
Group: None
Status: Open
>Resolution: Remind
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Complex number I leads to compilation error

Initial Comment:
The following question

t> Give $\sqrt{-1}$.
a> I
end>

gives the compilation error

Error while globalizing variables: 
invalid parameters for creation of table or array 
iproc = 

The same problem occurs if I try

t> Give $\sqrt{-1}$.
a> Complex(0,1)
end>

However the following works:

t> Give $\sqrt{-1}$.
a> sqrt(-1)
end>

If you need I somewhere in your calculations the safest 
solution that Marc found is to define a variable

b:= sqrt(-1)

and then use b instead of I everywhere.


----------------------------------------------------------------------

>Comment By: Gustav W Delius (gustav_delius)
Date: 2003-08-23 16:34

Message:
Logged In: YES 
user_id=737246

Neil, will you get around to fixing this for AiM 3.0? If not I will 
update the documentation to tell the user to use sqrt(-1) 
instead of I or Complex(0,1).

----------------------------------------------------------------------

Comment By: Neil Strickland (npstrick)
Date: 2003-07-03 12:52

Message:
Logged In: YES 
user_id=430681

This problem is caused by a bug in the makeglobal function
in the codegen package, which is (as of Maple 8) deprecated
in favour of the ToInert function and related utilities.  I
therefore propose to do nothing about it until I get around
to rewriting the `aim/Compile` function to use ToInert.

----------------------------------------------------------------------

You can respond by visiting: 
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[Aimmath-developers] [ aimmath-Bugs-764611 ] Complex number I leads to compilation error

[SourceForge.net <no...@so...>]

Bugs item #764611, was opened at 2003-07-02 14:18
Message generated for change (Comment added) made by gustav_delius
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=439479&aid=764611&group_id=44411

Category: Marking
Group: None
Status: Open
Resolution: Remind
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Complex number I leads to compilation error

Initial Comment:
The following question

t> Give $\sqrt{-1}$.
a> I
end>

gives the compilation error

Error while globalizing variables: 
invalid parameters for creation of table or array 
iproc = 

The same problem occurs if I try

t> Give $\sqrt{-1}$.
a> Complex(0,1)
end>

However the following works:

t> Give $\sqrt{-1}$.
a> sqrt(-1)
end>

If you need I somewhere in your calculations the safest 
solution that Marc found is to define a variable

b:= sqrt(-1)

and then use b instead of I everywhere.


----------------------------------------------------------------------

>Comment By: Gustav W Delius (gustav_delius)
Date: 2003-08-23 16:35

Message:
Logged In: YES 
user_id=737246

Neil, will you get around to fixing this for AiM 3.0? If not I will 
update the documentation to tell the user to use sqrt(-1) 
instead of I or Complex(0,1).

----------------------------------------------------------------------

Comment By: Gustav W Delius (gustav_delius)
Date: 2003-08-23 16:34

Message:
Logged In: YES 
user_id=737246

Neil, will you get around to fixing this for AiM 3.0? If not I will 
update the documentation to tell the user to use sqrt(-1) 
instead of I or Complex(0,1).

----------------------------------------------------------------------

Comment By: Neil Strickland (npstrick)
Date: 2003-07-03 12:52

Message:
Logged In: YES 
user_id=430681

This problem is caused by a bug in the makeglobal function
in the codegen package, which is (as of Maple 8) deprecated
in favour of the ToInert function and related utilities.  I
therefore propose to do nothing about it until I get around
to rewriting the `aim/Compile` function to use ToInert.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=439479&aid=764611&group_id=44411

[Aimmath-developers] [ aimmath-Feature Requests-792431 ] Answerprompt for MATRIX questions

[SourceForge.net <no...@so...>]

Feature Requests item #792431, was opened at 2003-08-21 10:15
Message generated for change (Comment added) made by gustav_delius
You can respond by visiting: 
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Category: Student interface
Group: None
>Status: Closed
Priority: 5
Submitted By: Gustav W Delius (gustav_delius)
>Assigned to: Gustav W Delius (gustav_delius)
Summary: Answerprompt for MATRIX questions

Initial Comment:
The answerprompt should also be implemented for 
MATRIX questions.

----------------------------------------------------------------------

>Comment By: Gustav W Delius (gustav_delius)
Date: 2003-08-23 16:15

Message:
Logged In: YES 
user_id=737246

This has now been implemented through a modification in 
MatrixQuestion.mpl

----------------------------------------------------------------------

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[Aimmath-developers] [ aimmath-Bugs-728361 ] No error message if Java not found during installation

[SourceForge.net <no...@so...>]

Bugs item #728361, was opened at 2003-04-27 11:10
Message generated for change (Settings changed) made by gustav_delius
You can respond by visiting: 
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Category: Others
Group: v1.0 (example)
>Status: Closed
>Resolution: Fixed
Priority: 4
Submitted By: Gustav W Delius (gustav_delius)
Assigned to: Neil Strickland (npstrick)
Summary: No error message if Java not found during installation

Initial Comment:
The usual behaviour of AutoConf.mpl (which is read 
during installation) is to complain about any installation 
problems like the unability to find required programs. 
However if Java is not found (because the location of 
Java is not correctly set in ManualConfig.mpl) then no 
error message is produced and instead it is reported that 
there were no problems.

----------------------------------------------------------------------

Comment By: Gustav W Delius (gustav_delius)
Date: 2003-05-20 08:35

Message:
Logged In: YES 
user_id=737246

Here is some more information:
To reproduce the problem in Windows XP (I have not tried 
under other versions of Windows) set 
Config['JavaHome'] := "C:":
in ManualConfig.mpl. Then run AutoConf.mpl.
AutoConf.mpl will report that "AIM was successfully 
configured. ....". However further up on the screen you will 
see:

Looking for Java
Error, (in os_system) Operating system error:
Command: dir /b "C:\java"
Return value: 1
Output:

This error message does not get recorded in autoconf.log.

----------------------------------------------------------------------

You can respond by visiting: 
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[Aimmath-developers] bug tracker messages

[Gustav W D. <gu...@ma...>]

I find these messages that the SourceForge bug tracker sends out extremely
user-unfriendly. The message you will have received recently was meant to
inform you that that particular bug has been resolved and closed.

Gustav

[Aimmath-developers] location for oreilly servlet classes

[Gustav W D. <gu...@ma...>]

Currently the oreilly servlet classes are copied from the WEB-INF/cos
directory to the WEB-INF/classes directory during installation. In the
release I would like to put them into the WEB-INF/classes directory from the
start so that no copying has to be done during installation. Are there any
objections?

Gustav

Re: [Aimmath-developers] windows installer

[Manolis M. <ma...@ma...>]

I ve seen Neil's and Alex's postings about Windows installation and as I
said before with the JRE probably installed in every windows these days an
installer would be easy to make (maybe have two versions one if people have
it and one if not). It actually depends on what else we would except to
distribute with the installer and what we are allowed to. In anycase I have
some experience in that from my previous work. Unfortunately I will not have
any time at all; not before Christmas especially because the last time I 've
done that it was foour years ago and things have changed from then. but I
could definetely get some advice from my previous colleagues. So if someone
finds time before Christmas I would be happy to help.

Manolis

----- Original Message -----
From: "Gustav W Delius" <gu...@ma...>
To: "AIM developers" <aim...@li...>
Sent: Saturday, August 23, 2003 10:47 AM
Subject: [Aimmath-developers] windows installer


> I think that having an automatic installation for AiM would be a big help
> for potential users. I see from posts on the list that Neil and Alex have
> started to look into this. Does anyone feel that they have the time and
> expertise to go ahead and do it? And how long do you think it would take?
> Clearly there are two completely different versions needed for Linux and
for
> Windows. The Windows version is probably more pressing because Linux users
> are usually happier with doing things by hand.
>
> Gustav
>
>
>
>
> -------------------------------------------------------
> This SF.net email is sponsored by: VM Ware
> With VMware you can run multiple operating systems on a single machine.
> WITHOUT REBOOTING! Mix Linux / Windows / Novell virtual machines
> at the same time. Free trial click
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> https://lists.sourceforge.net/lists/listinfo/aimmath-developers
>

[Aimmath-developers] examples

[Gustav W D. <gu...@ma...>]

CVS contains example questions using the trig package. Should these be
included in the AiM 3.0 release? Or should they be an optional additional
download?

In either case, the examples for the diff, int and matrix packages should
probably be treated in the same way. Neil, do you want to put them into CVS?

Gustav

[Aimmath-developers] AiM 3.0 will support Maple versions 7, 8, and 9

[Gustav W D. <gu...@ma...>]

As far as I am aware there is no one out there who has expressed an interest
in using AiM 3.0 with Maple 6 or lower. So AiM 3.0 will support only Maple
versions 7,8, and 9.

I can't test AiM under Maple 9 but I gather from the posts on this list that
all problems have been resolved and the code currently in CVS works with
Maple 9. Is that correct?

Gustav

[Aimmath-developers] Ken's servlet mod

[Gustav W D. <gu...@ma...>]

I intend to include Ken's modification of the servlet in the Windows version
of AiM 3.0 beta.

Can you please bring me up to date on the problems that the modified servlet
causes under Linux? Is it correct that these problems mean that the Linux
version of AiM 3.0 beta should be released with the unmodified servlet?

When will Ken's new servlet be ready?

Gustav

[Aimmath-developers] windows installer

[Gustav W D. <gu...@ma...>]

I think that having an automatic installation for AiM would be a big help
for potential users. I see from posts on the list that Neil and Alex have
started to look into this. Does anyone feel that they have the time and
expertise to go ahead and do it? And how long do you think it would take?
Clearly there are two completely different versions needed for Linux and for
Windows. The Windows version is probably more pressing because Linux users
are usually happier with doing things by hand.

Gustav

[Aimmath-developers] beta release tomorrow

[Gustav W D. <gu...@ma...>]

Dear All,

this is just a reminder that we are releasing AiM 3.0 beta tomorrow. So
please commit all your changes as soon as possible. I will now start to
write the release notes with a list of new features and bug fixes. I will
also write the new installation instructions (for Windows in the first
instance).

The purpose of the beta release is to give non-developers an easy way to
install and test the new version of AiM and to submit bug reports. I think
we can expect quite a large number of bugs to show up. We would really like
to have them all fixed before the release date of September 14. Who is
around in the coming three weeks to help with this?

We already have some bugs in the bug tracker at SourceForge and also a
larger number of feature requests in the feature request tracker. Please
take a look whenever you have time.

I believe that getting a sizeable number of people to use AiM in the coming
academic year is very important for AiM's future. As any open source project
AiM needs a large user base to be able to compete with commercial solutions.
We don't want to be overtaken by Maple TA. So the coming weeks are
important. Once we have a stable AiM 3.0 release we should all tell our
colleagues throughout the world about it.

One thing we really need is a user-friendly tutorial that teaches lecturers
how to use AiM and how to write their first questions. The "AiM question
syntax" document could be used as a starting point for such a tutorial. I am
planning to give registered users at aimmath.sourceforge.net the possibility
to log into a demo AiM server as a lecturer so that they can do the
exercises from the tutorial before having installed their own AiM server.
The demo AiM server is running on my home computer so that I don't have to
worry so much about the security risk that this poses. Unfortunately it also
means that the server will be down a lot because of the unreliable broadband
connection.

Gustav

[Aimmath-developers] [ aimmath-Feature Requests-792430 ] keep backup of question source files

[SourceForge.net <no...@so...>]

Feature Requests item #792430, was opened at 2003-08-21 03:13
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=439482&aid=792430&group_id=44411

Category: Interface Improvements
Group: None
Status: Open
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: keep backup of question source files

Initial Comment:
It has been reported by users that while editing the quiz 
souce file that the source is overwritten by an empty 
file when the user clicks on "Save and Recompile". This 
occurs when the server is busy. I am not quite sure 
what exactly the users did (like resubmit the request). 
But it would seem a good idea if the system could keep 
an automatic backup of the source.

----------------------------------------------------------------------

You can respond by visiting: 
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RE: [Aimmath-developers] PROPOSAL: Maple 9 mods;focus/solutions behavior;bug fixes

[Gustav W D. <gu...@ma...>]

Hi Ken,

I think your changes are great. Please commit them.

Sorry I did not reply earlier, I was away for a few days.

Regarding marking changes with your initials: I did this before we moved to
CVS. I now find it much easier to look at the diff than to search for
comments. But I think it is no problem if people put their initials into the
code. I don't even see any reason to remove those comments before the
release.

Gustav

[Aimmath-developers] [ aimmath-Feature Requests-792431 ] Answerprompt for MATRIX questions

[SourceForge.net <no...@so...>]

Feature Requests item #792431, was opened at 2003-08-21 10:15
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=439482&aid=792431&group_id=44411

Category: Student interface
Group: None
Status: Open
Priority: 5
Submitted By: Gustav W Delius (gustav_delius)
Assigned to: Nobody/Anonymous (nobody)
Summary: Answerprompt for MATRIX questions

Initial Comment:
The answerprompt should also be implemented for 
MATRIX questions.

----------------------------------------------------------------------

You can respond by visiting: 
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[Aimmath-developers] PROPOSAL: Maple 9 mods;focus/solutions behavior;bug fixes

[Ken M. <mo...@pt...>]

These aren't really MAJOR CHANGES (as described in the "Developer's
Etiquette" document), but I have a general question about protocol that I
want to ask before committing these changes, so I am listing them below in
case someone wants to comment.

I have been in the habit of commenting my changes by surrouning new lines
with

# KM
:
# END KM

and commenting out existing lines with

# DIST (existing line goes here)

This turns out to be VERY useful to me because I can easily find the lines
that I have changed and can easily revert back to what used to be there when
things don't work as planned.  I noticed also that Greg and Gustav have done
similar things in the past, and that has also been helpful in my opionion
since it is more convenient than using diff to compare two revisions of the
file.  Clearly we want to eventually remove such commenting before the code
goes into the main AIM distribution, but my question is whether or not we
should commit changes to the develop_2_1 version with such comment lines or
not.

Personally, I think we should commit such lines except in cases where the
comments would get out of hand, like when searching and replacing something
globally in all files, for example.  Then when the develop_2_1 version is
ready to be released, we could just grep out all of the extra comment lines.
The alternative would be for everyone to eliminate any such comment lines
before committing the changes so that no such comments appear in the
develop_2_1 code.  How do the rest of you feel about this?

Anyway, here are the changes I've made that I propose to commit:

Aug 19, 2003
------------
PROPOSAL
  I propose to commit the following changes

* Globally rename Latex to aim/LaTeX as described in previous postings by
Greg Gamble and myself to accomodate Maple 9 (affects 15 files)

* Minor tweak to `Class/Typefunction` to fix a problem that occurs in Maple
9

* Several changes to Aim.mpl, Util.mpl, aim/Question.mpl and aim/Quiz.mpl to
do the following:

  + Fixed the Mark Summary table so it uses the correct links when the quiz
is focused

  + Removed the focus option from the question toolbars when the Trying a
quiz in aim/Question.mpl (since there is already a "Try Separately" link)

  + Fixed a minor formatting bug in aim/Question.mpl

  + Changed the background color for the teacher's answer and solutions to
make it easier to quickly distinguish between viewing solutions and working
on an active quiz while focusing and unfocusing and reloading quizzes (see
below)

  + Added the aim/HTMLColoredPage method to aim/Util.mpl to allow us to set
the background color for the entire html page. Initially I was going to use
this to distinguish solutions pages from active quiz pages, but it was
overkill. :) Thus this function currently is not used for anything, but I
left it in there in case we decide to add such options in the future.

  + Changed the behavior of AIM with regard to showing solutions as follows:

    The only way for a student to get a new version of a quiz is if he (a)
is attempting the quiz for the first time or (b) requests a new version by
clicking on the New Version link.

    In particular, if the student elects to show solutions to a quiz, he
will continue to see the solutions to the quiz he just completed no matter
what he does until he clicks New Version. This allows a student, for
example, to view solutions on one machine, then switch to a different
machine to print them out (or view some of the solutions, then go for lunch,
and then return and read the rest of them).

    When viewing solutions, the focus option now focuses on the given
question and shows its solution instead of generating a new quiz and
focusing on that newly generated question. This allows a student to print
the solution to just one question instead of printing the solutions to the
entire quiz.

-----------------------------------------
Ken Monks - Professor of Mathematics
            University of Scranton
            Scranton, PA 18510
email: mailto:mo...@sc...
web:   http://www.scranton.edu/~monks
-----------------------------------------

Re: [Aimmath-developers] Tested modifications for the MathDisplay option

[Manolis M. <ma...@ma...>]

> The change works as before. You can now send the "MathDisplay=3Dtype"
> parameter to Alice where type is "html" or "latex". The default is "htm=
l".
> These are case-insensitive.
>
> Eventually it would be nice to support "mathml" too. The default would
then
> ideally be set according to what the browser supports. The use could be
> allowed to override this using the new parameter (eg. with a drop down
list
> on every page).

ok... that works. Do you still insist on having every page sending the
MathDisplay parameter. Is that really necessary ? We could all agree on a
better design as I think this should happen only once (per user perhaps i=
n
an initial page) and make things faster.

just my =A3.02 pounds worth...

Manolis

RE: [Aimmath-developers] why do we need jdk

[Neil S. <N.P...@sh...>]

> Unix:
> The JAVA_HOME variable is required for proper operation so should
> always be set if it is installed.

Agreed; the AIM installation script already looks for this.

> Windows:
> The install process writes the location in the registry. Look under
> HKEY_LOCAL_MACHINE\Software\JavaSoft\Java Runtime Environment
> There you will find keys for each version which has been
> installed. In each
> such key there is a "Java Home" string value.
>
> On windows your install process should always check for locations from the
> registry since the names can be changed. For example it doesn't actually
> have to be "C:\Windows"; you can call it what you like. Also I
> have "E:\" as
> my program files directory, not "C:\Program Files" for example.
> The windows directory is set in the environment (WINDIR) and also in the
> registry. Others can be found only in the registry.

Clearly Alex is right that we should get information from the registry, if
we can.  However, I do not know how to write a batch file or a Maple script
that consults the registry - does anyone else?

Ideally, we should work out how to do the usual Install Shield thing for
installation under Windows.  A while ago I installed Microsoft Visual
Studio,
which ought to let me do this, but there are many things I would need to
learn beforehand.

Neil

Re: [Aimmath-developers] why do we need jdk

[Alex S. <aw...@yo...>]

Hi

For your information, the JRE makes its location available as follows:

Unix:
The JAVA_HOME variable is required for proper operation so should always be
set if it is installed.

Windows:
The install process writes the location in the registry. Look under
HKEY_LOCAL_MACHINE\Software\JavaSoft\Java Runtime Environment
There you will find keys for each version which has been installed. In each
such key there is a "Java Home" string value.

On windows your install process should always check for locations from the
registry since the names can be changed. For example it doesn't actually
have to be "C:\Windows"; you can call it what you like. Also I have "E:\" as
my program files directory, not "C:\Program Files" for example.
The windows directory is set in the environment (WINDIR) and also in the
registry. Others can be found only in the registry.
The following keys are good places to look for Windows paths:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Setup
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\explorer\Shell
Folders
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\explorer\User
Shell Folders
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell
Folders
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User
Shell Folders
Application paths can often be found by seaching in:
HKEY_LOCAL_MACHINE\Software
Also many executable file locations are stored under:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\App Paths

Paths stored in HKEY_LOCAL_MACHINE are of course system wide while those in
HKEY_CURRENT_USER are for the current user only.

I hope this information helps.

Alex

[Aimmath-developers] Tested modifications for the MathDisplay option

[Alex S. <aw...@yo...>]

Hi

Thank you very much for your help. I have now been able to compile and test
my changes. It didn't work first time but it wasn't far off. I have got it
working and done a diff with what I started from. You should be able to
apply this even if the source has changed (provided the changes haven't been
too drastic!).

You need to run the decompressed file through 'patch -p1' in the
WEB-INF/java directory. Eg:
gzip -dc mathdisplay.diff.gz | patch -p1

Note that my source files had unix line breaks and I haven't tried applying
it on Windows.
In any case I should make a backup of Alice.java and Maple.java first.


The change works as before. You can now send the "MathDisplay=type"
parameter to Alice where type is "html" or "latex". The default is "html".
These are case-insensitive.

Eventually it would be nice to support "mathml" too. The default would then
ideally be set according to what the browser supports. The use could be
allowed to override this using the new parameter (eg. with a drop down list
on every page).

Cheers

Alex

RE: [Aimmath-developers] fix of av> sets answerprompt problem

[Gustav W D. <gus...@ya...>]

Manolis wrote:

>  I think there may be something wrong with the develop_2_1 branch. The
> oreilly com files are not there but they are neither at the bin
> as they used
> to be and they will not be copied to the correct position.

They are there. See
http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/aimmath/AIM/WEB-INF/cos/com/o
reilly/servlet/?only_with_tag=develop_2_1.

>  By the way I noticed that the windows installation doesn't
> expect people to
> run te servlet.mpl. Is that intentional ?

Yes, that is intentional because servlet.mpl is read automatically by
autoconf.mpl now.

Gustav

Re: [Aimmath-developers] why do we need jdk

[Manolis M. <ma...@ma...>]

> If we can get away with the jre (= java runtime environment), that would
be
> good, as many people will have it installed already.  We would need to
know
> where to look, however.  Under Windows XP professional, I have a JRE at
> C:\Program Files\JavaSoft\JRE\1.3.1  I am not sure how standard this
> location
> is, or how exactly it came to be installed there; in particular, I am not
> sure whether every Windows XP installation has the jre installed by
default.

all Win32 platforms come with copies of java at c:\winnt\system32 for NT
(2000, XP, NT) or c:\windows\system (for Win98) and the directories are also
in the path so it can be used directly.

Perhaps the default could be this path and  the installation can lok for
java there and if it doesn't exist prompt the user to download the JRE from
sun (or the installation page) and they would have to change the
configuration file and set the path for java.

Manolis

ps. In fact JRE is redistributable so we could even put it in the ZIP file
but as Neil said there is no point on that as most people will have it (we
can tell them to check on their own before downloading it)