KeycloakTest.java

        File initialFile = new File("/home/dcheung/keycloak.json");
        InputStream targetStream = new FileInputStream(initialFile);
        KeycloakInstalled keycloakInstalled = new KeycloakInstalled(targetStream);
        System.out.println("-- Login in --");
        keycloakInstalled.loginCommandLine();
        System.out.println("-- Getting token --");
        System.out.println(keycloakInstalled.getTokenString());


// Output
-- Login in --
Failure:  Invalid WWW-Authenticate header.
-- Getting token --
null