ServerValues.resolveDeferredValue has incorrect cast

Commencez par ServerValues.resolveDeferredValue dans ServerValues.java:44 et suivez ses appelants via ServerValues.resolveDeferredValueSnapshot et Repo.setValue. Reproduisez l'échec avec DatabaseReference.setValue en utilisant la valeur d'incrément .sv sous forme de map documentée. C'est terminé lorsque cette entrée n'échoue plus avec la ClassCastException signalée et que le comportement a été vérifié conformément aux étapes de reproduction de l'issue.

• Operating System version: Gentoo Linux
• Firebase SDK version: 9.3.0
• Library version: 9.3.0 (but the bug goes back to at least 8.1.0)
• Firebase Product: RTDB

As ServerValue.increment is still not supported by this SDK 4 years after its introduction, I tried implementing it manually. This triggers a ClassCastException inside the SDK due to a bad assumption that the value of the .sv key is always a String.

Steps to reproduce:

1. Create the data structure for ServerValue.increment as described in documentation (such as the REST documentation):

{
  ".sv": {
    "increment": delta
  }
}

2. Call setValue using this data structure.

Relevant Code:

var node = databaseNode();
node.setValue(Map.of(".sv", Map.of("increment", delta)), callback);

Error:

2024-06-21T19:58:12,008Z [firebase-database-worker] ERROR c.g.firebase.database.core.RunLoop - Uncaught exception in Firebase Database runloop (9.3.0). Please report to firebase-database-client@google.com
java.lang.ClassCastException: class java.util.HashMap cannot be cast to class java.lang.String (java.util.HashMap and java.lang.String are in module java.base of loader 'bootstrap')
	at com.google.firebase.database.core.ServerValues.resolveDeferredValue(ServerValues.java:44)
	at com.google.firebase.database.core.ServerValues.resolveDeferredValueSnapshot(ServerValues.java:80)
	at com.google.firebase.database.core.Repo.setValue(Repo.java:376)
	at com.google.firebase.database.DatabaseReference$1.run(DatabaseReference.java:305)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)