Spring load file from resources or from file system

TestResourceLoad.java

public void testResourceLoad(ResourceLoader resourceLoader) {
    System.out.println("resourceLoader k:" + resourceLoader.getResource("keycloak.json").exists());
    System.out.println("resourceLoader /k:" + resourceLoader.getResource("/keycloak.json").exists());
    System.out.println("resourceLoader c:k:" + resourceLoader.getResource("classpath:keycloak.json").exists()); // dev
    System.out.println("resourceLoader c:/k:" + resourceLoader.getResource("classpath:/keycloak.json").exists()); // dev
    System.out.println("resourceLoader f:k:" + resourceLoader.getResource("file:keycloak.json").exists()); // jar
    System.out.println("resourceLoader f:/k:" + resourceLoader.getResource("file:/keycloak.json").exists());
    System.out.println("getClass() k:" + getClass().getResource("keycloak.json"));
    System.out.println("getClass() /k:" + getClass().getResource("/keycloak.json")); // dev
    System.out.println("getClass() c:k:" + getClass().getResource("classpath:keycloak.json"));
    System.out.println("getClass() c:/k:" + getClass().getResource("classpath:/keycloak.json"));
    System.out.println("getClass() f:k:" + getClass().getResource("file:keycloak.json"));
    System.out.println("getClass() f:/k:" + getClass().getResource("file:/keycloak.json"));
    System.out.println("File k:" + new File("keycloak.json").exists()); // jar
    System.out.println("File /k:" + new File("/keycloak.json").exists());
}

/** 
  * Resulting code I'm using. Results in this:
  * 1. Look in working directory (e.g. when running a jar file)
  * 2. Look in classpath (e.g. when developing in src/main/resources/)
  **/
private InputStream getInputStream() {
    Resource resource = resourceLoader.getResource("file:" + filename);
    if (resource.exists()) {
        LOG.info("Loading keycloak.json from file: " + resource);
    } else {
        resource = resourceLoader.getResource("classpath:" + filename);
        if (resource.exists()) {
            LOG.info("Loading keycloak.json from classpath: " + resource);
        } else {
            throw new RuntimeException("Unable to find keycloak.json (neither in working dir nor classpath)");
        }
    }
    try {
        return resource.getInputStream();
    } catch (IOException e) {
        throw new RuntimeException("Failed to get InputStream from " + resource);
    }
}