Why Does getResourceAsStream Return Null When Loading Resources from a JAR?

getResourceAsStream Returns Null When Loading Resources from JAR

When attempting to load a text file from a JAR package using Class::getResourceAsStream, you may encounter a null return value. To resolve this issue, consider the following:

The Lifepaths.class.getClass().getResourceAsStream(...) method uses the system class loader, which may not have access to resources within the JAR. Instead, use Lifepaths.class.getResourceAsStream(...) to utilize the class loader that loaded the Lifepaths class, ensuring access to JAR resources.

When invoking getResourceAsStream(name), ensure that the name begins with a forward slash "/". This practice is generally recommended to avoid potential issues.

Here is an example of the corrected code:

public static void execute() {
    System.out.println(Lifepaths.class.getResourceAsStream("/initialization/Lifepaths.txt"));
}

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