Скачать или смотреть How to Solve the No 'Arial' Font Found! Error in Your Spring Boot Dockerized Application

A guide to resolving the `No 'Arial' font found!` issue in Dockerized Spring Boot applications using Spire PDF. Learn how to install necessary fonts and update Docker configurations for seamless performance.
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Resolving the No 'Arial' Font Found! Error in Your Spring Boot Dockerized Application

If you're running a Spring Boot application that manipulates PDF files using Spire PDF, you might encounter the dreaded error: No 'Arial' font found! This error can be particularly frustrating when your application works perfectly in a local environment but fails in a Docker container. In this guide, we will explore the root cause of this issue and provide a step-by-step guide to resolve it effectively.

Understanding the Problem

When you dockerize your application, you're creating a separate containerized environment. This means that any system-level dependencies, such as fonts, need to be explicitly installed within the Docker image. When your application tries to convert a PDF to PDF/A3 format using Spire PDF, it requires access to specific fonts. Missing fonts lead to the application throwing an exception, halting your process and leaving you with a frustrating debugging experience.

The Error Log

Here's the relevant portion of the error log that indicates the problem:

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This message clarifies that the Arial font, a commonly used typeface for documents, is not available in the container. Let’s delve into how we can resolve this.

Step-by-Step Solution

1. Update Your Dockerfile

To address the missing font issue, you’ll need to modify your Dockerfile to include the installation of the necessary fonts. Here's an updated Dockerfile incorporating these changes:

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Key Changes Made:

Font Installation: The lines responsible for installing Microsoft core fonts (ttf-mscorefonts-installer) were added. This ensures that your application has access to the Arial font and others when the container is built.

Font Cache Update: Running fc-cache -f -v helps refresh the font cache so the newly installed fonts are recognized.

2. Build and Run Your Docker Container

After updating the Dockerfile, you need to rebuild your Docker image and run your container. Use the following commands in your terminal:

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This will trigger the build process, applying all the changes made to the Dockerfile.

3. Verify Your Application

Once the container is up and running, attempt the PDF conversion operation again. Make sure to check the logs for any additional errors. If everything is configured correctly, the application should now be able to locate the Arial font and proceed with the conversion without any issues.

Conclusion

Dockerizing a Spring Boot application that requires specific fonts can pose challenges, but following these procedures can help you tackle the common No 'Arial' font found! error. By installing necessary fonts within your Docker container, you ensure that your application's PDF processing functionalities run smoothly in a containerized environment.

Feel free to reach out if you have any questions or require further assistance! Happy coding!