How to Fix the \'Location is not set\' Error When Packaging JavaFX Applications with JARS?

JAVAFX: Handling "Location is not set" Error While Packaging with JAR

Your code runs smoothly in Eclipse, but when packaged as a JAR and executed via cmd, it encounters a "Location is not set" error. This issue arises because the method getClass().getResource(...) expects a resource, not a direct file path.

In Java, resources are defined using a hierarchy of valid Java identifiers separated by slashes (/) and a resource name (shortname.extension). When loading classes from the file system, this equates to a file path. However, when using other class loading mechanisms, it's crucial to adhere to these specifications.

Resolving the Error

To rectify the issue, replace your current code with the following:

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

Alternative Approach: Controller Location

Since your FXML and controller files are in the same package, you can leverage controller locations to load FXML:

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

This method is more robust and simplifies future refactoring, as the compiler verifies the package name automatically. Additionally, any changes to the package structure can be handled seamlessly by Eclipse.

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