`exportgraphics` to PDF causes Java error in Arch/Manjaro Linux

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Chunyu Xiao
Chunyu Xiao 2022-5-29
回答： Abhishek Chakram 2023-9-28
Hello everyone,
When I try to export the figure to PDF vector graphics, the exportgrachics function fails with Java error and generates a empty PDF.
A minimal example could be:
ezplot('sin(x)')
exportgraphics(gcf,'sin.pdf')
and the corresponding Java error is:
Error using exportgraphics
java.lang.NullPointerException
at org.apache.fop.fonts.autodetect.FontInfoFinder.find(FontInfoFinder.java:219)
at org.apache.fop.fonts.FontAdder.add(FontAdder.java:63)
at org.apache.fop.fonts.FontDetectorFactory$DefaultFontDetector.detect(FontDetectorFactory.java:105)
at org.apache.fop.fonts.FontManager.autoDetectFonts(FontManager.java:229)
at org.apache.fop.fonts.DefaultFontConfigurator.configure(DefaultFontConfigurator.java:82)
at
org.apache.fop.svg.PDFDocumentGraphics2DConfigurator.createFontInfo(PDFDocumentGraphics2DConfigurator.java:143)
at
org.apache.fop.svg.PDFDocumentGraphics2DConfigurator.configure(PDFDocumentGraphics2DConfigurator.java:87)
at com.mathworks.hg.print.FOPFontConfigurator.configurePDFFonts(FOPFontConfigurator.java:57)
at com.mathworks.hg.print.FOPPDFVectorStrategy.startJob(FOPPDFVectorStrategy.java:89)
at com.mathworks.hg.util.HGVectorOutputHelper.open(HGVectorOutputHelper.java:74)
The same problem occurs in my both Arch and Manjaro system, the system infomations are below:
  • MATLAB version: R2022a
  • Linux kernel: Arch 5.18, Manjaro 5.15
  • System default Java: java18-openjdk
The function worked very well in MATLAB R2021b before, but I have uninstalled the previous version.
Since Arch/Manjaro is not officially support by MathWorks, I have to turn to the community for help. I would appreciate if anyone could give me some solutions or suggestions. Thanks for your attention.

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回答（1 个）

Abhishek Chakram
Abhishek Chakram 2023-9-28
Hi Chunyu Xiao,
It is my understanding that you have encountered a Java error when using the exportgraphics function to export a figure to PDF in MATLAB on Arch/Manjaro Linux, it could be due to a compatibility issue with the Java Runtime Environment (JRE) on your system.
Here are a few steps you can try to resolve the issue:
1. Update your Java installation: Make sure you have the latest version of Java installed on your system. You can update Java by running the following command in the terminal:
sudo pacman -Syu jre-openjdk
This command will update the JRE to the latest version available in the Arch Linux repositories.
2. Set the Java version for MATLAB: MATLAB might be using a different Java version than the one installed on your system. To ensure MATLAB uses the updated Java version, you can try setting the MATLAB_JAVA environment variable to the path of the JRE installation. Open a terminal and run the following command:
export MATLAB_JAVA=/usr/lib/jvm/java-<version>-openjdk
Replace <version> with the appropriate version number of the JRE installed on your system.
3. Use an alternative method to export to PDF: If the above steps do not resolve the issue, you can try using an alternative method to export the figure to PDF. For example, you can use the print [AJ1] function with the -dpdf option to save the figure as a PDF file:
print('figure_name.pdf', '-dpdf')
Replace 'figure_name.pdf' with the desired file name and path.
Best Regards,
Abhishek Chakram

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