Why Does `class.getResource()` Return Null When Trying to Access a Resource File in IntelliJ Idea?

Resource File Not Found with class.getResource

When attempting to retrieve a resource file using class.getResource(), as seen in the code snippet below, it may return null unexpectedly:

URL url = ExchangeInterceptor.class.getResource("GeoIP.dat");

Solution for IntelliJ Idea Users

Specifically for users of IntelliJ Idea, it is recommended to check the following setting:

Settings > Build, Execution, Deployment > Compiler > Resource patterns

This setting specifies the extensions that are interpreted as resources. Ensuring that the file extension of your resource file matches one of the patterns listed here is crucial. If the extension does not comply, class.getResource will return null for resources with that extension.

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