How to Resolve the \"Location is not Set\" Error in JavaFX When Running from a JAR?

JavaFX Location Not Set Error Resolution

When attempting to run a JavaFX project via command line after creating a JAR file, you may encounter a "Location is not set" error. This issue arises when using getClass().getResource() correctly in the context of resource loading and localization.

The method getClass().getResource() is intended to load resources, not specify a file path. While this may appear to work in the IDE due to the class loader resolving it from the file system, it may fail when using the JAR class loader, which does not implement resource resolution in the same manner.

Solution 1: Using Absolute Resource Path

To resolve the issue, specify the FXML file's absolute resource path using the / separator:

<code class="java">FXMLLoader loader = new FXMLLoader(getClass().getResource("/sm/customer/CustomerHome.fxml"));</code>

Solution 2: Using Controller Locations

Alternatively, you can leverage your code organization and load the FXML file relative to its controller:

<code class="java">FXMLLoader loader = new FXMLLoader(CustomerHomeCtrl.class.getResource("CustomerHome.fxml"));</code>

This approach aligns with the structured packaging of your controllers and FXML files and simplifies refactoring by automatically updating import statements when moving FXML and controllers.

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