Notes on Android cannot connect to the sever

This issue respects the following points:

• I have read the FAQ
• I have searched for existing issues
• The issue affects the Notes Android app, neither the Notes server app nor the Nextcloud Android app.

Describe the bug

After installing the app and trying to connect to self-hosted server configured in the main Android Nextcloud app, the Notes app throws an error which says something like "wrong answer from the server" and that's it. The app is completely unusable.

Notes apps on the server is working without any issues through web interface.

The main Android Nextcloud app works without issues with the same server and account.

Expected behavior

No response

Notes Android version

33.1.0

Notes server version

5.0.0

Nextcloud Android version

33.1

Nextcloud version

33.0.2

Device

Samsung Galaxy S10

Android Version

12

App Store

• Google Play Store
• F-Droid
• Huawei App Gallery

Stacktrace

App Version: 33.1.0

App Version Code: 330010090

App Flavor: play

Files App Version Code: 330010090 (PROD)

---

OS Version: 4.14.113-25257816(G973FXXSGHWC1)

OS API Level: 31

Device: beyond1

Manufacturer: samsung

Model (and Product): SM-G973F (beyond1lteeea)

---

java.lang.NullPointerException: Attempt to invoke virtual method 'int com.google.gson.JsonPrimitive.getAsInt()' on a null object reference

	at it.niedermann.owncloud.notes.persistence.sync.CapabilitiesDeserializer.deserialize(CapabilitiesDeserializer.java:87)

	at it.niedermann.owncloud.notes.persistence.sync.CapabilitiesDeserializer.deserialize(CapabilitiesDeserializer.java:32)

	at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:95)

	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$2.readIntoField(ReflectiveTypeAdapterFactory.java:271)

	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$FieldReflectionAdapter.readField(ReflectiveTypeAdapterFactory.java:559)

	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:517)

	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$2.readIntoField(ReflectiveTypeAdapterFactory.java:271)

	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$FieldReflectionAdapter.readField(ReflectiveTypeAdapterFactory.java:559)

	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:517)

	at com.google.gson.Gson.fromJson(Gson.java:1358)

	at com.google.gson.Gson.fromJson(Gson.java:1259)

	at com.google.gson.Gson.fromJson(Gson.java:1227)

	at com.nextcloud.android.sso.api.NextcloudAPI.convertStreamToTargetEntity(NextcloudAPI.java:136)

	at com.nextcloud.android.sso.api.NextcloudAPI.lambda$performRequestObservableV2$0(NextcloudAPI.java:98)

	at com.nextcloud.android.sso.api.NextcloudAPI.$r8$lambda$af7W9mq2B0ZrhVJwZd-ibFp8T3Y(Unknown Source:0)

	at com.nextcloud.android.sso.api.NextcloudAPI$$ExternalSyntheticLambda1.subscribe(D8$$SyntheticClass:0)

	at io.reactivex.internal.operators.observable.ObservableFromPublisher.subscribeActual(ObservableFromPublisher.java:31)

	at io.reactivex.Observable.subscribe(Observable.java:12284)

	at io.reactivex.internal.operators.observable.ObservableSingleMaybe.subscribeActual(ObservableSingleMaybe.java:31)

	at io.reactivex.Maybe.subscribe(Maybe.java:4290)

	at io.reactivex.Maybe.blockingGet(Maybe.java:2320)

	at io.reactivex.Observable.blockingSingle(Observable.java:5381)

	at it.niedermann.owncloud.notes.persistence.CapabilitiesClient.getCapabilities(CapabilitiesClient.java:38)

	at it.niedermann.owncloud.notes.importaccount.ImportAccountActivity.lambda$onActivityResult$5(ImportAccountActivity.java:103)

	at it.niedermann.owncloud.notes.importaccount.ImportAccountActivity.$r8$lambda$wIJzzcgrzM9d6k7exwdLMn3GvgQ(Unknown Source:0)

	at it.niedermann.owncloud.notes.importaccount.ImportAccountActivity$$ExternalSyntheticLambda4.run(D8$$SyntheticClass:0)

	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:462)

	at java.util.concurrent.FutureTask.run(FutureTask.java:266)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)

	at java.lang.Thread.run(Thread.java:920)

Start in CapabilitiesDeserializer.java at line 87 and trace the capabilities response used by CapabilitiesClient.getCapabilities during ImportAccountActivity account import. Reproduce the connection with the reported server setup and verify that importing the account completes without the reported NullPointerException or unusable connection error.