@Yoshi
I am afraid you need R2008a or later in any case to use GTool.

Hi, I also got the same error…
“which GTool” says
“/Applications/MATLAB74/waterloo/Waterloo_MATLAB_Library/Waterloo_Swing_Library/GTools/GTool.m”

MATLAB Version: R2007a
Java VM Version: Java 1.6.0_51 with Apple Inc. Java HotSpot(TM) Client VM mixed mode

Thank you in advance for your help.

% To use Waterloo, you need to type "waterloo" at the MATLAB prompt
% at the start of each subsequent MATLAB session
if ~isempty(which('waterloo.m'))
    fprintf('It looks like Waterloo is already present at:\n%s\n',strrep(which('waterloo.m'),[filesep 'Waterloo_MATLAB_Library' filesep 'waterloo.m'],''));
    disp('Delete the old waterloo folder and remove it from your MATLAB path first');
else
    installFolder=fullfile(char(java.lang.System.getProperty('user.home')), 'Documents');
    disp('Downloading zip.....this will take a few minutes');
    % N.B. Using latest here does is not guaranteed to  give the same result as clicking latest on
    % the sourceforge site.
    f=unzip('http://sourceforge.net/projects/waterloo/files/Waterloo%5B1.1Beta%5D/waterloo.zip/download', installFolder);
    disp('Setting MATLAB Path.....');
    if isdir(fullfile(installFolder,'waterloo','Waterloo_MATLAB_Library'))
        addpath(fullfile(installFolder,'waterloo','Waterloo_MATLAB_Library'));
        savepath();
        fprintf('Installed the following %d files/folders:\n', numel(f));
        for k=1:numel(f)
            disp(f{k});
        end
        disp('To use Waterloo, you need to type "waterloo" at the MATLAB prompt during each MATLAB session');
        waterloo();
        disp('Note: You may be prompted to add a Waterloo Setting folder when first running Waterloo');
        disp('This allows you to set user-specified default colors etc.');
    else
        disp('Installation was not successful');
    end
end

@Dan

Also, which version of Java does MATLAB use? Type ver at the matlab prompt. You should see something like:

Operating System: Mac OS X  Version: 10.8.3 Build: 12D78 
Java Version: Java 1.6.0_45-b06-451-11M4406 with Apple Inc. Java HotSpot(TM) 64-Bit Server VM mixed mode

AFAIK, there is no way to get MATLAB to recognise Java 7 on Mac. If you have found a way, I’d like to know it too.

@Dan

You seem to have the Waterloo MATLAB Library only where you need to install the other components also.
You need a main folder named “waterloo” as the code uses relative addressing to find everything it needs.

The beta version (Git only at present) gives more helpful error messages in such cases.

The short script below will do all the work if you prefer from inside MATLAB – but I would recommend a clean MATLAB session. Cut and paste this into the MATLAB command window. Installation on Mountain Lion will normally be to ~/Documents/waterloo.

Notes:
1. Do not save the path afterwards. Waterloo.m sets ups the path automatically in each session (that speeds up MATLAB searches when Waterloo is not in use).
2. You may her the cooling fan kick in – that is likely to be anti-virus software checking all the java .jar files which are compressed.

% To use Waterloo, you need to type "waterloo" at the MATLAB prompt
% at the start of each subsequent MATLAB session
if ~isempty(which('waterloo.m'))
    fprintf('It looks like Waterloo is already present at:\n%s\n',strrep(which('waterloo.m'),[filesep 'Waterloo_MATLAB_Library' filesep 'waterloo.m'],''));
    disp('Delete the old waterloo folder and remove it from your MATLAB path first');
else
    installFolder=fullfile(char(java.lang.System.getProperty('user.home')), 'Documents');
    disp('Downloading zip.....this will take a few minutes');
    % N.B. Using latest here is not guaranteed to give the same result as clicking latest on the sourceforge site.
    f=unzip('http://sourceforge.net/projects/waterloo/files/Waterloo%5B1.1Alpha2%5D/Waterloo%5B1.1Alpha2%5D.zip/download', installFolder);
    disp('Setting MATLAB Path.....');
    if isdir(fullfile(installFolder,'waterloo','Waterloo_MATLAB_Library'))
        addpath(fullfile(installFolder,'waterloo','Waterloo_MATLAB_Library'));
        savepath();
        fprintf('Installed the following %d files/folders:\n', numel(f));
        for k=1:numel(f)
            disp(f{k});
        end
        disp('To use Waterloo, you need to type "waterloo" at the MATLAB prompt during each MATLAB session');
        waterloo();
        disp('Note: You may be prompted to add a Waterloo Setting folder when first running Waterloo');
        disp('This allows you to set user-specified default colors etc.');
    else
        disp('Installation was not successful');
    end
end

>> addpath ~/matlabdownloads/Waterloo_MATLAB_Library/
>> waterloo

Project Waterloo...Graphics Library loaded...Swing Library loaded...Utilities loaded

Project Waterloo [Version=1.1 Dated:18-Nov-2012 13:21:10]
Setting up Waterloo distribution

Project Waterloo Java files added to MATLAB Java class path

Looking for sigTOOL support...   
Undefined variable "kcl" or class "kcl.waterloo.graphics.gui.Welcome.createWelcome".

Error in waterloo (line 235)
welcomeFrame=kcl.waterloo.graphics.gui.Welcome.createWelcome();

(In case it’s also relevant, I have Java 7 Update 21 installed)

Any suggestions what I might try to get it to work?

Thanks
Dan