Скачать или смотреть How to Create a module-info.class File and Add it to Your JAR

Learn how to easily create a `module-info.class` file for your JavaFX project and add it to your JAR file to resolve jlink errors.
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How to Create a module-info.class File and Add it to Your JAR

If you're working on a JavaFX project and planning to use the zxing library for QR code generation, you may encounter a hurdle: the jlink tool throws an error stating that the "automatic module cannot be used with jlink." Luckily, there's a solution that involves creating a module-info.class file for the library manually. In this guide, we’ll guide you through the steps to properly generate and add this class file to your JAR, ensuring that your project runs smoothly.

Why You Need a module-info.class File

Java's module system helps in managing dependencies more effectively, especially when working with a modular application. When you try to use libraries like zxing that don’t come with a module-info.class, it can lead to issues with modular tooling like jlink. Here’s how to tackle this problem comprehensively.

Step-by-Step Guide: Creating module-info.class for zxing

Step 1: Prepare Your Environment

Copy the JAR file: Start by copying the JAR file you want to modify (in this case, zxing which might be core-3.4.1.jar) to a folder designated for libraries.

Example: Place it inside a folder called libs.

Step 2: Navigate with Command Prompt

Open Command Prompt: Next, you need to open your command prompt on your operating system.

Change Directory: Navigate to the parent folder of the libs directory where your JAR is located.

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Step 3: Generate module-info.java

Run jdeps Command: Now, execute the following command to generate the module-info.java file:

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This command will create a module-info.java file. Depending on the library, it may appear as com.google.zxing/module-info.java, within the libs folder.

Step 4: Compile module-info.java

Copy the File: Move the generated module-info.java file back into the main libs folder for easy access.

Compile the Module Info: Use the following command to compile your module-info.java file, which will create the required module-info.class:

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After executing this command, the module-info.class file will be successfully generated in the libs folder.

Step 5: Inject module-info.class into the JAR

Inject Class File into JAR: Finally, run the command below to inject the newly created module-info.class into your JAR file:

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Conclusion

By following these steps, you'll have effectively injected a module-info.class file into your JAR, allowing you to seamlessly integrate the zxing library into your JavaFX project. Always remember that this workaround should be utilized as a last resort when no other alternatives are available. This process has been detailed to help you overcome the jlink integration error with clarity and purpose.

Now, you're ready to explore more about Java modules and effectively handle dependencies in your project. Happy coding!