@Bean
fun firebase(): DatabaseReference {
    val options = FirebaseOptions.Builder()
            .setDatabaseUrl("https://hacker-news.firebaseio.com/")
            .setServiceAccount(this.javaClass.getResourceAsStream("/account.json"))
            .build()

    val app = FirebaseApp.initializeApp(options)
    val instance = FirebaseDatabase.getInstance(app)

    return instance.reference
}

Caused by: java.lang.IllegalStateException: Service Account must be provided.
at com.google.firebase.internal.Preconditions.checkState(Preconditions.java:173) ~[firebase-server-sdk-3.0.3.jar:na]
at com.google.firebase.FirebaseOptions.<init>(FirebaseOptions.java:129) ~[firebase-server-sdk-3.0.3.jar:na]