java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference

Thanks for your great work. I’m using your lib for a while and run some tests but currently getting the following error when trying to init RxFingerprint.decrypt()

java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference at android.os.Parcel.readException(Parcel.java:1626) at android.os.Parcel.readException(Parcel.java:1573) at android.hardware.fingerprint.IFingerprintService$Stub$Proxy.authenticate(IFingerprintService.java:300) at android.hardware.fingerprint.FingerprintManager.authenticate(FingerprintManager.java:601) at android.hardware.fingerprint.FingerprintManager.authenticate(FingerprintManager.java:574) at android.hardware.fingerprint.FingerprintManager.authenticate(FingerprintManager.java:552) at com.mtramin.rxfingerprint.FingerprintObservable.subscribe(FingerprintObservable.java:81) at io.reactivex.internal.operators.observable.ObservableCreate.subscribeActual(ObservableCreate.java:40) at io.reactivex.Observable.subscribe(Observable.java:10179) at io.reactivex.Observable.subscribe(Observable.java:10165) at io.reactivex.Observable.subscribe(Observable.java:10096) at gui.Login.initFingerprints(Login.java:179) at gui.Login.onResume(Login.java:1179) at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1287) at android.app.Activity.performResume(Activity.java:7015) at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4210) at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:4323) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1865) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:7325) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

Source

Disposable disposable = RxFingerprint.decrypt(this, "k", AppSettings.getFingerprintHash(getAppContext())). subscribe(fingerprintDecryptionResult -> { //line 179 if(fingerprintDecryptionResult != null){ switch(fingerprintDecryptionResult.getResult()){ case FAILED: setStatusText("Fingerprint not recognized, try again!"); break; case HELP: setStatusText(fingerprintDecryptionResult.getMessage()); break; case AUTHENTICATED: setStatusText("decrypted:\n" + fingerprintDecryptionResult.getDecrypted()); break; } } }, throwable -> { //noinspection StatementWithEmptyBody if(RxFingerprint.keyInvalidated(throwable)){ // The keys you wanted to use are invalidated because the user has turned off his // secure lock screen or changed the fingerprints stored on the device // You have to re-encrypt the data to access it } Log.e("ERROR", "decrypt", throwable); });

Any idea where it comes from?

[hvge]

Hi guys, I discovered this ticket while was working on a similar problem. Check out my last comment in wultra/powerauth-mobile-sdk#202, if this is still an issue, of course 😃

[Farasy]

@Farasy How did you reproduce this issue? Actually, I got crash logs, but unable to reproduce this issue.

Missed your question, sorry… but i guess i can’t help you. I did some tests with a service that ended in above message. However, don’t know what i did exactly (anymore ) oO