DatabaseException: Failed to get FirebaseDatabase instance: FirebaseApp object has no DatabaseURL in its FirebaseOptions object

[Steffen Mayer]

Hi,

I'm getting the following exception when I make a 'release' build with Dexguard/Proguard:

com.google.firebase.database.DatabaseException: Failed to get FirebaseDatabase instance: FirebaseApp object has no DatabaseURL in its FirebaseOptions object.

The  'debug' build is working fine.

Could it be that DexGuard/Proguard is messing with the "google-services.json" file (which has the "DatabaseURL") in the app folder of my project?

I already tried it with "-dontobfuscate" which did not help.

What else could be wrong?

Best regards,
Steffen

[Kato Richardson]

Hi Steffen,

There are some instructions on configuring ProGuard here. Have you already tried that?

☼, Kato

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[Steffen Mayer]

Hi Kato,

Thanks for your reply.

With the help of the DexGuard Support I just found the solution for my problem.

The values of the google-services.json are generated as strings in a value.xml file.

I had to add the following config to keep those values accessible:

-keepresources string/default_web_client_id
-keepresources string/firebase_database_url
-keepresources string/gcm_defaultSenderId
-keepresources string/google_api_key
-keepresources string/google_app_id
-keepresources string/google_crash_reporting_api_key
-keepresources string/google_storage_bucket

Best regards,

Steffen

[Frank van Puffelen]

Thanks for responding back with the solution Steffen. I didn't realize that proguard would strip those values.

     puf

[Steffen Mayer]

Btw. I'm using the commercial version of ProGuard (DexGuard). I'm not sure if ProGuard also strips those values.

I wonder though if it could be harmful if someone else reverse engineers those values?

[Frank van Puffelen]

These values are all perfectly safe to keep in your APK. In fact with the web client, we include them in plain text.