How Do I Access FXML Files in Maven-Based JavaFX Projects?

Accessing FXML Files in Maven JavaFX Projects

In JavaFX applications, referencing FXML files from controllers is crucial. When structuring your project using Maven, it's important to consider the location of your FXML files within the resource folder.

Resource Lookup in Java

Before delving into the specific solution, it's worth noting that FXML file lookup is a type of generic resource lookup task in Java. The FXMLLoader takes the resource location as input, so the lookup itself occurs within your calling application code.

Options for FXML Location Resolution

There are several ways to structure your FXML files and resolve their locations:

1. Place FXML files in the src/main/resources directory:

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

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

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

3. Place FXML files in a corresponding resource directory:

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

   This assumes that the class performing the FXML loading is in the corresponding Java source hierarchy.

FXMLLoader Usage Recommendations

For optimal results, it's recommended to:

• Instantiate FXMLLoader via new FXMLLoader() instead of static methods.
• Set the location on the instantiated FXMLLoader and use load().
• Derive a location based on a class using getClass().getResource().

IDE and Build Settings

Ensure that your IDE or build tool copies FXML files from the resource folder to the build output directory.

Java Jigsaw Modular Applications

For modular applications built using Java Jigsaw, use the class to obtain resources directly instead of the class loader:

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

By following these guidelines, you can effectively reference your FXML files within your JavaFX Maven project controllers.

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