Why Does My JavaFX Application Throw a \'Location is Not Set\' Error When Running from a Jar File?

JavaFX: Troubleshooting "Location is Not Set" Error in Jar File Execution

During the execution of a JavaFX jar file, users may encounter the "Location is not set" error. This article aims to address this issue, particularly in scenarios where the code runs properly in Eclipse.

Problem Definition

When creating a jar file from a project with a specific folder structure and executing it via the command line, the error "Location is not set" is displayed. The project's directory structure includes FXML files and controllers organized in specific packages.

Cause Analysis

The root cause of the error lies in the way resources are loaded using getClass().getResource(...). This method expects a resource path that conforms to Java identifier conventions. However, in the provided code, the resource path contains .., which is not a valid identifier. As a result, the resource cannot be resolved when the jar file is executed.

Solution 1: Ensuring Correct Resource Path

To resolve the issue, modify the resource path to ensure it follows Java identifier conventions. For instance:

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

Solution 2: Leveraging Controller Location for FXML Loading

In cases where FXML files and controllers are organized in the same package, it is possible to utilize controller locations for FXML loading. This eliminates the need to specify the absolute path to the FXML file:

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

Benefits of Using Controller Location

Utilizing controller locations offers several advantages:

• Automatic updates to import statements upon refactoring.
• Simplified code maintenance and reduced risk of errors.
• Natural alignment with the project structure.

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