Firebase Callbacks Work During Testing But Not During Runtime

I'm using Firebase in an Android app. The app sets up something like a groupchat and allows users to join. The users get a key and can then connect themselves to the corresponding

Solution 1:

The reason is that Firebase always calls its callbacks from the main thread.

The "main" thread in my tests is called something like "junittestrunnerXXX". And Firebase creates a new thread called "main" to call the callbacks.

At runtime, the "main" thread is the actual "main" thread. If I call get() on that, it is blocked for good. Firebase checks if this thread exists and since it already exists and since it is blocked, nothing happens.