Why Does getResourceAsStream Return Null in Java, and How Can I Fix It?

Troubleshooting "getResourceAsStream Returns Null" Issue in Java

When attempting to load a file within a JAR using getResourceAsStream, it's possible to encounter a null return. To resolve this, it's crucial to understand how resources are loaded and the correct path format.

The default loading mechanism in getResourceAsStream employs the system class loader. However, this approach may not have access to resources within your JAR. Instead, utilize Lifepaths.class.getResourceAsStream(...), which uses the class loader that loaded the Lifepaths class. This loader has access to the JAR's resources.

Additionally, ensure that the resource path begins with "/". While this may not be strictly necessary, it has been observed to cause issues if omitted.

Therefore, to properly load the file Lifepaths.txt from within the specified directory structure, use the following syntax:

Lifepaths.class.getResourceAsStream("/initialization/Lifepaths.txt")

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