/usr/share/psychtoolbox-3/PsychJava/PsychJavaTrouble.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
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% PsychJavaTrouble -- What to do if Java-based Psychtoolbox functions fail?
%
% You probably arrived at this help text because of an error in execution
% of one of the Psychtoolbox Java based functions, e.g., ListenChar,
% CharAvail, GetChar or FlushEvents.
%
% There are four common reasons for failure of Java based Psychtoolbox
% functions:
%
% 1. You run Matlab in nojvm mode, i.e., you started Matlab via 'matlab
% -nojvm'. In that case, Matlabs Java virtual machine is disabled and so
% are all Java based Psychtoolbox functions. In that case you need to
% restart Matlab with its Java VM enabled.
%
% 2. You run GNU/Octave, which doesn't support our Java based keyboard
% functions. However, then you should not ever end here, as we use an
% alternate implementation on Octave.
%
% 3. The Psychtoolbox/PsychJava/ subfolder of your working copy of
% Psychtoolbox isn't included in Matlabs static Java classpath. The
% Psychtoolbox installer/upgrader (DownloadPsychtoolbox, SetupPsychtoolbox
% or UpdatePsychtoolbox, as well as DownloadAdditionsForLinux) usually
% tries to edit the 'classpath.txt' file, or since Matlab 8.1,
% 'javaclasspath.txt', of your Matlab installation in order to add the
% Psychtoolbox/PsychJava subfolder to Matlabs classpath. This procedure may
% fail due to insufficient access permissions on your system. You can
% verify this by entering 'type classpath.txt' at the Matlab prompt. The
% printed file should contain the path to the PsychJava folder. If it
% doesn't, you may want to edit the file yourself ('which classpath.txt'
% tells you the location of the file) or ask a system administrator to do
% it for you. After editing the file you need to restart Matlab. Instead of
% manual editing you can also call this function as PsychJavaTrouble(1); -
% This will try to automatically modify the classpath.txt or
% javaclasspath.txt file if your Matlab runs with sufficient permissions,
% e.g., administrator permissions.
%
% If you need a quick temporary fix for the problem, other than editing
% classpath.txt and restarting Matlab, then type 'PsychJavaTrouble' at the
% Matlab command prompt. The function will add the PsychJava folder to the
% dynamic classpath to immediately enable Java based Psychtoolbox
% functions. This fix is temporary however, it needs to be repeated after
% each restart of Matlab. Executing the command will also clear all
% variables and functions from Matlabs workspace (like 'clear all'), so
% adding it to experiment scripts may impair proper working of that
% scripts.
%
% 4. You didn't restart Matlab after the Psychtoolbox installer asked you
% to do so. -> Restart Matlab and retry.
%
% 5. The versions of GetCharJava bundled with Psychtoolbox are incompatible
% with the version of Java installed on your machine or bundled with your
% version of Matlab. If you have a Java SDK installed on your machine,
% Psychtoolbox will try to compile a matching version of GetCharJava. This
% should succeed on OS-X but is unlikely to work on Windows, because that
% system does not have a javac compiler installed by default.
%
% 6. Other reasons: Post to the Psychtoolbox forum and ask for help.
%
% Good luck!
% History:
% 20.09.2006 Written (MK)
% 13.05.2013 Add Matlab static classpath setup code as helper for routines
% like PsychtoolboxPostInstallRoutine.m (MK)
% Only fix class path dynamically by default:
if nargin < 1 || isempty(installStatic)
installStatic = 0;
end
% Dynamic fix requested, aka installStatic is 0 / false?
if ~installStatic
% Yes:
if IsOctave
error('Running on GNU/Octave: Java is not supported on that system. Sorry!');
end
if ~exist('javaaddpath') %#ok<EXIST>
error('Your version of Matlab does not support dynamic Java class path. Sorry!');
end
try
fprintf('PsychJavaTrouble: Will now try to add the PsychJava folder to Matlabs dynamic classpath...\n');
javapath = [PsychtoolboxRoot 'PsychJava'];
javaaddpath(javapath);
fprintf('PsychJavaTrouble: Added PsychJava folder to dynamic class path. Psychtoolbox Java commands should work now!\n');
return;
catch %#ok<CTCH>
psychrethrow(psychlasterror);
error('Failed to add PsychJava to classpath for unknown reason!');
end
return;
end
% If we reach this point, then we're asked to update the static classpath
% file, just as it would happen during PTB updates and installation:
% If we're using Matlab then add the PsychJava stuff to the static
% Java classpath.
if ~IsOctave
try
% Figure out the PsychJava path we need to add to the static Java
% classpath.
path_PsychJava = [PsychtoolboxRoot, 'PsychJava'];
% Matlab 8.1 changes the rules about static java classpath. Lovely.
if verLessThan('matlab', '8.1')
% Legacy: Open up the classpath.txt file and find any PsychJava
% entries. If they exist, remove them, and put the current one
% in the file. This only allows on PsychJava to be on the
% path.
classpathFile = which('classpath.txt');
else
% Matlab version 8.1 (R2013a) or later. classpath.txt can't be
% used anymore. Now they want us to store static classpath
% definitions in a file called javaclasspath.txt inside the
% Matlab preference folder:
% Try to find the file, if it already exists, e.g., inside the
% Matlab startup folder:
classpathFile = which('javaclasspath.txt');
% Found it?
if isempty(classpathFile)
% Nope. So we try the preference folder.
% Retrieve path to preference folder. Create the folder if it
% doesn't already exist:
prefFolder = prefdir(1);
classpathFile = [prefFolder filesep 'javaclasspath.txt'];
if ~exist(classpathFile, 'file')
fid = fopen(classpathFile, 'w');
fclose(fid);
end
end
end
% Define name of backup file:
bakclasspathFile = [classpathFile '.bak'];
if ~verLessThan('matlab', '7.14')
% New style method: (textread() is deprecated as of at least R2012a)
fid = fopen(classpathFile);
fileContentsWrapped = textscan(fid, '%s', 'delimiter', '\n');
fclose(fid);
fileContents = fileContentsWrapped{1};
else
fileContents = textread(classpathFile, '%s', 'delimiter', '\n'); %#ok<REMFF1>
end
j = 1;
newFileContents = {};
pathInserted = 0;
for i = 1:length(fileContents)
% Look for the first instance of PsychJava in the classpath and
% replace it with the new one. All other instances will be
% ignored.
if isempty(strfind('PsychJava', fileContents{i}))
newFileContents{j, 1} = fileContents{i}; %#ok<AGROW>
j = j + 1;
elseif ~isempty(strfind('PsychJava', fileContents{i})) && ~pathInserted
newFileContents{j, 1} = path_PsychJava; %#ok<AGROW>
pathInserted = 1;
j = j + 1;
end
end
% If the PsychJava path wasn't inserted, then this must be a new
% installation, so we append it to the classpath.
if ~pathInserted
newFileContents{end + 1, 1} = path_PsychJava;
end
% Now compare to see if the new and old classpath are the same. If
% they are, then there's no need to do anything.
updateClasspath = 1;
if length(fileContents) == length(newFileContents)
if strcmp(fileContents, newFileContents)
updateClasspath = 0;
end
end
if updateClasspath
% Make a backup of the old classpath.
clear madeBackup;
[s, w] = copyfile(classpathFile, bakclasspathFile, 'f');
if s==0
error(['Could not make a backup copy of Matlab''s JAVA path definition file.\n' ...
'The system reports: ', w]);
end
madeBackup = 1; %#ok<NASGU>
% Write out the new contents.
FID = fopen(classpathFile, 'w');
if FID == -1
error('Could not open Matlab''s JAVA path definition file for write access.');
end
for i = 1:length(newFileContents)
fprintf(FID, '%s\n', newFileContents{i});
end
fclose(FID);
fprintf('\n\n');
disp('*** Matlab''s Static Java classpath definition file modified. You will have to restart Matlab to enable use of the new Java components. ***');
fprintf('\nPress RETURN or ENTER to confirm you read and understood the above message.\n');
pause;
end
catch %#ok<CTCH>
lerr = psychlasterror;
fprintf('Could not update the Matlab JAVA classpath file due to the following error:\n');
fprintf('%s\n\n', lerr.message);
fprintf('Either you have a very old Matlab version which does not support JAVA or, most\n');
fprintf('likely, you do not have sufficient access permissions for the Matlab application folder\n');
fprintf('or file itself to change the file %s .\n', classpathFile);
fprintf('Please ask the system administrator to enable write-access to that file and its\n');
fprintf('containing folder and then repeat the update procedure.\n');
fprintf('Alternatively, ask the administrator to add the following line:\n');
fprintf('%s\n', path_PsychJava);
fprintf('to the file: %s\n\n', classpathFile);
fprintf('If you skip this step, Psychtoolbox will still be mostly functional, \n');
fprintf('but the Java-based commands ListenChar, CharAvail, GetChar and FlushEvents\n');
fprintf('on Linux, MacOS-X and M$-Windows in Java mode will work less efficiently.\n');
fprintf('For more info see ''help PsychJavaTrouble''.\n\n');
fprintf('\nPress RETURN or ENTER to confirm you read and understood the above message.\n');
pause;
% Restore the old classpath file if necessary.
if exist('madeBackup', 'var')
[s, w] = copyfile(bakclasspathFile, classpathFile, 'f'); %#ok<NASGU,ASGLU>
end
end
end % if ~IsOctave
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