Скачать или смотреть Troubleshooting OpenJFX 14 with Maven and IntelliJ: Resolving Application Run Issues

Discover solutions to common issues when running OpenJFX applications in Java 14 with Maven and IntelliJ, including dependency management and plugin configurations.
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This video is based on the question https://stackoverflow.com/q/61684739/ asked by the user 'Ombrelin' ( https://stackoverflow.com/u/11834812/ ) and on the answer https://stackoverflow.com/a/65247635/ provided by the user 'Agata Kobusinska' ( https://stackoverflow.com/u/4260451/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting OpenJFX 14 with Maven and IntelliJ: Resolving Application Run Issues

When working with modern Java applications that utilize OpenJFX, developers sometimes encounter hurdles that can disrupt their workflow. One common issue arises when trying to run an application built with OpenJFX on a Java project, particularly when using Maven in IntelliJ. If you are facing the error message that states: "Output directory is empty, compile first", you're not alone. This guide will guide you through the steps to resolve this issue effectively.

Understanding the Problem

In a multi-module Java project using IntelliJ, especially when you integrate OpenJFX, the complexity can lead to configuration hiccups. The error you are encountering, "Output directory is empty, compile first," typically indicates that the build process has not generated the necessary compiled files to run your application. This can occur due to various reasons, such as incorrect plugin configurations or the order of operations not being followed correctly.

Example Scenario

You have multiple modules in your project, with the essential OpenJFX dependency added to the module containing your main class. You also set up your top-level pom.xml with the necessary OpenJFX plugin configurations. However, despite running the commands you thought were correct, you still can't get your application to launch.

Steps to Resolve the Issue

To fix the problem and successfully run your OpenJFX application, follow these organized steps:

1. Check Your pom.xml Configuration

Ensure that your module's pom.xml is set up correctly. Here’s an example of how your configuration should look:

[[See Video to Reveal this Text or Code Snippet]]

Also, verify that your top-level pom.xml has the right plugin configuration:

[[See Video to Reveal this Text or Code Snippet]]

2. Install and Compile the Project

Before attempting to run the application, it is crucial to install and build all the modules in your project. Run the following command in your project’s root directory:

[[See Video to Reveal this Text or Code Snippet]]

3. Navigate to the Module Folder

Once the installation is successful, navigate to the specific module that contains the main application logic. For example:

[[See Video to Reveal this Text or Code Snippet]]

4. Execute the Application

Now you can run your OpenJFX application with the following command:

[[See Video to Reveal this Text or Code Snippet]]

Possible Post-Collection Errors

Sometimes, after making changes to your code, you might encounter strange errors, like missing components when attempting to rerun the application. In such cases, repeating the above steps often resolves the issue:

Run mvn install again.

Navigate back to the module folder.

Execute the mvn javafx:run command again.

By systematically following these steps, you will ensure that your project is compiled and configured correctly, allowing your OpenJFX application to run smoothly.

Conclusion

Setting up and running OpenJFX applications in a multi-module Maven project in IntelliJ can be tricky, but understanding the proper configurations and steps can make the process easier. By carefully checking your pom.xml settings, installing your project correctly, and running your application in the right order, you should be able to overcome the challenges you’re facing with OpenJFX and have your application running effortlessly.

If you find yourself stuck again, remember these troubleshooting techniques, and don’t hesitate to consult your colleagues or online forums for additional support. Happy coding!