How to Load Resources from a JAR File in Java?

Load a Resource Contained in a Jar

In Java, loading resources is crucial for accessing static files such as images, sound clips, and configuration files. When resources are stored within a JAR file (Java Archive), accessing them can be challenging.

One common approach to load resources is using getResource. However, as described in the question, this method returns different paths depending on whether the application is running from an IDE or a JAR file.

To circumvent this issue, it's advisable to use getResourceAsStream instead. This method returns an InputStream that allows direct access to the resource's contents. Here's an example:

InputStream inputStream = this.getClass().getResourceAsStream("/repository");

With InputStream, you can leverage methods like read and readAllBytes to retrieve the resource's contents.

Alternatively, you could directly set system properties using the resource's contents, as such:

System.setProperty("javax.net.ssl.trustStore", this.getClass().getResource("/truststore").toString());

Note that this solution assumes the resources are not physically located in separate files on the file system. If that's the case, you may need to handle the extraction and storage of resources from the JAR file as part of your application's initialization process.

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