Why Does My JAVAFX Jar File Throw a \'Location Not Set\' Error?

Location Not Set Error in JAVAFX Jar File

When creating a jar file for a JAVAFX application, an error may occur stating "Location is not set." This error typically originates from the use of ClassLoader's getResource(...) method with invalid path strings.

Problem Analysis:

The code provided uses getClass().getResource("../customer/CustomerHome.fxml") to load the FXML resource. However, according to Java specifications, resources must follow a specific format with valid Java identifiers separated by slashes. The presence of ".." in the path violates this rule.

Solution 1: Using Absolute Resource Paths:

To resolve the issue, use absolute paths to resolve resources from the jar. For example:

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

Solution 2: Using Controller Locations to Load FXML:

If FXML files are organized within the same packages as their controller classes, you can leverage class references to load FXML resources:

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

This approach simplifies refactoring and package structure maintenance.

Conclusion:

By understanding Java's rules for resource identification and using correct path formats, developers can avoid the "Location is not set" error when creating jar files for JAVAFX applications.

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