Configure Java AWT and Java Swing in Matlab Docker Image

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Angelina Prokopeva
回答： Swastik Sarkar 2024-3-15
To make a custom style cheker that we want to run in Jenkins as one of a auto-test we use:
function indentedText = indentcode(text,language)
it is needed to get right indentation in the code.
This function utilizes something undocumented interacting with Java Swing :
function indentedText = indentcode(text,language)
%indentcode Indents code.
% indentcode(T) indents text T according to user's preferences specified
% for the MATLAB language. Indented text retains the same line separator
% style as specified by the input text.
%
% indentcode(T,L) specifies language L and must be one of the following:
% 'c', 'java', 'matlab', 'plain', 'simscape', 'tlc', 'verilog',
% 'vhdl', 'xml'.
%
% This file is for internal use only and is subject to change without
% notice.
% Copyright 2012 The MathWorks, Inc.
error(javachk('swing'));
narginchk(1,2);
if ~ischar(text)
error(message('MATLAB:INDENTCODE:NotString'));
end
if nargin < 2
language = 'matlab';
end
if strcmp(text, '')
indentedText = text;
return
end
switch language
case 'c'
langInst = com.mathworks.widgets.text.cplusplus.CLanguage.INSTANCE;
case 'java'
langInst = com.mathworks.widgets.text.java.JavaLanguage.INSTANCE;
case 'matlab'
langInst = com.mathworks.widgets.text.mcode.MLanguage.INSTANCE;
case 'simscape'
langInst = com.mathworks.widgets.text.simscape.SimscapeLanguage.INSTANCE;
case 'xml'
langInst = com.mathworks.widgets.text.xml.XMLLanguage.INSTANCE;
otherwise
error(message('MATLAB:INDENTCODE:InvalidLanguage'));
end
indentedText = char(com.mathworks.widgets.text.EditorLanguageUtils.indentText(...
langInst,text));
end
It works fine in a normal Matlab with GUI, but does not work inside the Matlab Docker Image.
We tried to install Java into the Matlab Docker Image, but it did not help.
Here is a question, is it possible to run this function inside the Matlab Docker Image?
Thank you!

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回答（1 个）

Swastik Sarkar
Swastik Sarkar 2024-3-15
Hello @Angelina Prokopeva,
It seems you're attempting to use the 'indentcode' function within a MATLAB Docker image but are encountering the ‘Swing is currently not available’ error.
This issue typically arises because MATLAB, when run without a display, does not load all Java Libraries. You can verify which Java libraries are loaded with the 'javachk' command.
To address this, I recommend a workaround that involves simulating an X display to ensure all Java Libraries are loaded. Here's how you can proceed:
  1. Start by getting a shell to your Docker container. Use the -shell flag with your docker image command like so:
docker run -it -- rm -p 8888:8888 --shm-size=512M mathworks/matlab:r2021b -shell
2. Once in the shell, update your package lists and install OpenJDK and Xvfb (X virtual framebuffer):
sudo apt update
sudo apt install openjdk-17-jdk xvfb
3. After installing the dependencies, initiate a dummy X Display server. In this example, we'll use port :99:
sudo Xvfb :99 &
4. With the X Display server running, you can now execute the ‘indentcode’ function in MATLAB, specifying the display to use:
matlab -batch "indentcode('disp(a);')" -display :99
Hope this helps you use ‘indentcode’ in your Docker container and smoothly integrate with Jenkins.

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