Why Does JavaFX Throw a \'Location is Required\' Error Despite the FXML File Being in the Same Package?

JavaFX "Location is Required" Error Despite Being in the Same Package

Issue Description:

Executing a JavaFX program may result in a "java.lang.NullPointerException: Location is required" error, despite the FXML file residing in the same package as the Application class.

Underlying Cause:

The error occurs when FXMLLoader attempts to load the FXML file using getClass().getResource(). In a Maven project environment, this approach may fail if Maven module configuration is incorrect or classpath settings are misconfigured.

Fix with ClassLoader:

To resolve the issue within Maven, use getClass().getClassLoader().getResource() to locate the FXML file. This method retrieves the resource from the current project's classpath, ensuring that Maven can correctly resolve its location.

Modified Code:

Replace getClass().getResource() with getClass().getClassLoader().getResource() in the following line:

<code class="java">Parent root = FXMLLoader.load(getClass().getResource("main.fxml"));</code>

<code class="java">Parent root = FXMLLoader.load(getClass().getClassLoader().getResource("main.fxml"));</code>

Additional Maven Considerations:

For Maven projects, ensuring that the corresponding Maven module is correctly configured for the resources is crucial. Proper packaging and dependencies are essential to avoid conflicts and misconfigurations.

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