Why Does My JavaFX JAR File Throw a \'Location Not Set\' Error When Loading FXML?

Location Not Set Error in JavaFX When Creating JAR

The error "Location not set" often arises when creating a JAR file of a JavaFX project. This error indicates that the FXML file cannot be loaded within the JAR environment. To resolve this issue, consider the following steps:

1. Specify Resource Path:

When loading an FXML file, ensure that you specify the correct path to the resource. The path should be a valid Java identifier, without relative navigation (e.g., ..). Try using:

FXMLLoader loader = new FXMLLoader(getClass().getResource("/sm/customer/CustomerHome.fxml"));

2. Use Controller Locations:

If your FXML and controller files are located in the same package, you can load the FXML relative to the controller:

FXMLLoader loader = new FXMLLoader(CustomerHomeCtrl.class.getResource("CustomerHome.fxml"));

This approach takes advantage of the controller's package name and reduces the need for manual path updates during refactoring.

Resource Path Considerations:

1. Resources are identified by strings with substrings separated by slashes (/).
2. Each substring must be a valid Java identifier.
3. The resource name follows the format shortName or shortName.extension.
4. Both shortName and extension must be valid Java identifiers.

Additional Notes:

1. The file system class loader may resolve relative paths differently from the JAR class loader.
2. Leveraging controller locations for FXML loading promotes code organization and simplifies refactoring.

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