Why does Classpath Resource Not Found when Running as Jar File?

Classpath Resource Not Found When Running as Jar File

When loading a classpath resource using an @Value annotation, it's crucial to consider the file's location. If the resource is embedded within a JAR file, using resource.getFile() to retrieve its contents may result in exceptions, as getFile() expects the resource to be available on the file system.

To retrieve the resource's contents from a JAR file, use resource.getInputStream() instead. This allows you to read the resource's content irrespective of its location.

Here's an example of how to modify your application to use getInputStream():

<code class="java">private void testResource(Resource resource) {
  try {
    InputStream inputStream = resource.getInputStream();
    printFileContents(inputStream);
  } catch (IOException ex) {
    logger.error(ex.toString());
  }
}

private void printFileContents(InputStream inputStream) {
  BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
  bufferedReader.lines().forEach(logger::debug);
}</code>

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