How to Locate FXML Files in Maven Projects?

Referencing FXML Files from Maven Projects

In your JavaFX application, you aim to load FXML files from the resource folder using code like:

FXMLLoader.load(getClass().getResource("main.fxml"));

While your resource folder is in the build path, you encounter errors. To resolve this, let's explore options for locating FXML files.

Generic Resource Lookup in Java/JavaFX

Recall that FXML file location lookup is a subset of generic resource lookup in Java. Resource files (including FXML files) are specified relative to your classpath. For a comprehensive guide, refer to:

• JavaFX Resource Lookup: https://javafx-docs.github.io/javafx-docs/javafx/2.2/resources/resource_lookup.htm
• Eden Guide: https://edencoding.com/javafx-resource-files

Example Usage

The following code snippet demonstrates loading an FXML file:

FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("/main.fxml"));
Parent content = loader.load();

Location Resolution Options

There are several options for specifying the FXML file location within your resource folder:

1. Place all FXML files in src/main/resources:

loader.setLocation(getClass().getResource("/main.fxml"));

2. Place FXML files in src/main/resources/fxml:

loader.setLocation(getClass().getResource("/fxml/main.fxml"));

3. Place FXML files in corresponding resource directories:

Assuming your class loading the FXML is in src/main/java/com/mycompany/myapp, you can put the FXML file in:

src/main/resources/com/mycompany/myapp/main.fxml

And load it using:

loader.setLocation(getClass().getResource("main.fxml"));

FXMLLoader Usage Recommendations

• Instantiate FXMLLoader via new FXMLLoader(), not static methods.
• Set the location on the instantiated FXMLLoader and call load(), instead of loading from a stream.
• Use getClass().getResource() to derive a URL-based location.

IDE and Build Settings

Ensure that your IDE or build tool copies FXML files from the resource directory to the build output directory. Refer to Intellij settings guidance to manage this: https://stackoverflow.com/questions/25232751/how-to-convert-a-normal-java-project-in-intellij-into-a-javafx-project.

Java Jigsaw Modular Applications

In Java Jigsaw applications, get resources directly from the class, not the class loader.

// Avoid:
ComboBoxStyling.class.getClassLoader().getResource("/css/styleclass.css");

// Use:
ComboBoxStyling.class.getResource("/css/styleclass.css");

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