What is the way to reach a configuration file contained in the jar?

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In order to reach a configuration file contained in a jar file, you can use the following code snippet:

InputStream inputStream = getClass().getResourceAsStream("/config/config.properties");
Properties properties = new Properties();
properties.load(inputStream);

This code assumes that the configuration file is located in a folder named "config" at the root of your jar file. The getResourceAsStream method retrieves the file as an InputStream, which can be read using a Properties object to access individual properties.